engine reviewer

Question Choice A Choice B Choice C Choice D Answer

1. Cylinder oil is used for _________. 2-stroke engine 4-stroke and 2 stroke engine

4-stroke engine gasoline engine A

2. An air compressor is equipped with an intercooler and an aftercooler to___________ .

prevent overheating of first stage valves

reduce the compressed air charge density

increase compressor efficiency

inject water vapor into the compressed air

C

3. What component of the freshwater evaporator on board use to boil seawater, using the main engine jacket cooling water?

Shell Evaporator Ejector Condenser B

4. One of the major components of centrifugal pump is___________.

gear screw impeller piston C

5. The high pressure cut-out switch will stop the refrigeration compressor when there is______.

accumulation of refrigerant in the crankcase oil

restricted suction filter

a stoppage of condenser cooling water flow

lack of refrigerant C

6. If the bowl of a disk type centrifugal purifier when operated as a separator is not primed, the______.

purifier will act as a clarifier at the discharge ring

oil solids will be deposited only at the intermediate top disk

oil will be lost through the water discharge ports

oil has a tendency to emulsify in the bowl

C

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7. The storage tank for liquid refrigerant in a refrigeration system is called __________.

purging tank receiver dehumidifier charging tank B

8. Part of centrifugal disc purifier use to hold discs in place and directs the flow of dirty liquid to the bottom then to the discs as the oil flows upward is called ____________.

top disc bowl main cylinder distributor D

9. The high pressure side of the refrigeration systems starts from the _______.

compressor to the condenser

compressor to the expansion valve

evaporator to the compressor

expansion valve to the compressor

B

10. The dehydrator of a refrigeration system is located____________.

before expansion valve

after evaporator before liquid receiver

after oil separator A

11. A suitable location for the installation of an impulse type steam trap would be in the__________ -

steam supply line to a feedwater heater

drain line from a high point in the main steam line expansion loop

vacuum drag line from the atmospheric drain tank to the main condenser

horizontal run of drain line from the lowest point at the outlet of the heat exchanger

D

12. Which of the listed types of steam traps operates on the principle that hot water flashes to steam when its vapor pressure is reached?

Thermostatic Bimetallic Ball float Impulse D

13. A material use to protect the internal parts of air compressor from solid particles which can be sucked along with fresh air is called____.

Intake filter Air cleaner Unloader Paper cartridge A


14. Air leaking into a flash type distilling plant could occur through_______.

gasketed joints, cooling tubes, and valve stem

gasketed joints, valve stem, and gage glass packing

gasketed joints, cooling tubes, and gage glass packing

salinometer, valve steam, and gage glass packing

B

15. Unloader in air compressor is use to________.

equalize first stage and second stage pressure

prevent excessive load on the motor during starting

drain water from cylinder

release excess oil from the compressor

B

16. Which of the listed operations will cause an automatically controlled refrigeration compressor to restart?

An increase in the suction pressure

Closing of the solenoid valve

Closing of the expansion valve

A decrease in the suction pressure

A

17. A high reading at a salinity cell located in the loop seal between two stages of a flash type evaporator indicates_____.

carryover in the first- stage

chill shocking is necessary to remove scale

leakage at the second- stage condenser

faulty operation of the brine overboard pump

A

18. Component of an engine used to increase scavenging air is called ___________.

scavenging flaps turbocharger engine blower scavenging valve B

19. The operation of a thermostatic steam trap depends upon the__________.

change in the amount of vapor produced within an enclosed chamber

action of a float within a chamber

difference in movement of two dissimilar bimetallic strips not fastened together

fact that hot water under pressure tends to flash into steam when its vapor pressure is rapidly reduced

A

20. The low pressure side of a refrigeration system is considered to exist from the ______.

expansion valve to the compressor

condenser to the expansion valve

expansion valve to the evaporator

evaporator to the condenser

A


21. A protective device use to prevent over torque during starting of an Air Compressor is called_____.

reliever air release device solenoid unloader D

22. Condensers located in the various stages of the flash evaporator are cooled by_________.

seawater air distillate brine A

23. The separation chamber of the purifier is called ________.

pilot valve assembly

bowl heavy liquid chamber

light liquid chamber

B

24. Type of pump which is dependent of the head is______________.

reciprocating pump

piston pump screw pump centrifugal pump D

25. It refers to an internal combustion engine practice, where there is a necessity of heating the oil, to ensure easy flow and good atomization.

Re-circulating Tracing steam Pre-heating Pilot injection C

26. Main component of the engine to regulate speed is the ___________.

telegraph fuel rack valve gear governor D

27. A badly leaking refrigeration compressor discharge valves will cause __________.

damage to the condenser

flooding of the receiver

constant running of the compressor

overfeeding of the expansion valve

C

28. The by-products of oxidation, as a result of water contamination of hydraulic oil, are generally______.

removed by cellulose type filters

always neutralized by oil additives

harmless and have no effect on system components

gums, varnishes, and acids

D

29. The purpose of wear ring in the centrifugal pump is to ___________.

maintain alignment of shaft

prevent leakage minimize wear of impeller and casing

prevent damage to shaft

C


30. Short cycling of a refrigeration compressor refers to_____________.

running too slow frequently starting and stopping

frequently grounding out

running too fast B

31. The heat gained per pound of refrigerant in the evaporator is known as the_______________.

sensible heat specific heat of vaporization

refrigerating effect latent heat of vaporization

C

32. Diesel engine jacket water is used in the fresh water distillation process as the __________.

primary means of producing a vacuum within the distiller

means of heating the feedwater

coolant for the distillate

coolant for the brine cooler

B

33. Parts of the pump used to maintain the alignment of the pump are_____.

wear rings bearings impeller lantern ring B

34. Which characteristic of the theoretical Otto cycle does not occur in the theoretical Diesel cycle.

Rapid pressure decrease during compression.

Rapid volume increase during combustion.

The entire fuel charge is present for ignition.

No pressure increase during combustion.

C

35. Stern tube is used to__________. transmit the power from main engine to propeller

reduce vibration of engine

protect the engine from its axial thrust

support and seal the propeller shaft

D

36. If the temperature of the fuel oil entering in atomizer is too low, the burner will __________.

produce smoke white

require more fuel for atomization

require more excess air for combustion

produce heavy black smoke at any load condition

D

37. Salinity cell is installed in the distilling unit to indicate the ____________.

quantity of freshwater produced

leaking tube amount of chemical to be added

quality of water produced

D

38. Main engine lube oil sump tank is located __________.

above the engine at the same level as the main bearing

at the bottom of the engine

next to the engine C


39. It is a form of energy which crosses the boundary of a system during a change of state produced by a difference of temperature between the system and its surroundings.

Potential energy first law of thermodynamics

Heat Kinetic energy C

40. Burned gas from each cylinder is directed to the exhaust manifold which is part of___________.

2-stroke engine both 4-stroke engine and 2 stroke engine

4-stroke engine internal combustion engine

A

41. The purpose of expansion valve is to__________.

provide an orifice between the high pressure and low pressure side of the system

change the gas to a liquid

provide a chamber for the pre-expansion of the liquid

to speed-up the flow of refrigerant

A

42. The inlet pipe connection of dirty oil in disc type centrifugal purifier is located at the __________.

top of the bowl cover

bottom of the bowl cover

top and bottom of bowl cover

side of the bowl cover

A

43. The purpose of the low pressure cutout switch is to ____________.

maintain a preset suction pressure to the compressor

maintain liquid refrigerant at the suction of the compressor

start and stop the compressor at preset operating pressures

operate at minimum efficiency

C

44. Refrigerant is circulated through a refrigeration system by the ___________.

condenser compressor expansion valve evaporator B

45. The liquid indicator sight glass is generally located in the ____________.

high pressure vapor line

low pressure vapor line

high pressure liquid line

low pressure liquid line

C


46. If an air compressor intercooler pressure rises above normal, it usually indicates __________.

dirty lube oil dirty intercooler hot environment leaking valves B

47. Breaking the fuel into fine spray to provide good combustion is called__________.

refining purifying honing atomizing D

48. A squeaking sound occurring from within an operating reciprocating air compressor is an indication of_______.

tight compressor bearings

compressor overload

motor overload badly leaking unloaders

A

49. A salinity indicating system functions on the basic principle of measuring the____.

hydrogen ion concentration of water

electrical conductivity of water

electrical inductance of water

specific gravity of water

B

50. Boiler fire side must be kept free of soot accumulations because ____.

soot interferes with the flow of feedwater

the steam drum internals will become clogged

the fuel oil heaters will become overloaded

soot insulates the boiler heating surfaces

D

51. A dehydrator installed in a refrigeration system is used to remove _____.

oil from the refrigerant

refrigerant from the oil

moisture from the system

noncondensable gases and vapors

C

52. Fluctuations in the pressure and temperature of the steam supplied to the first-effect of a low pressure submerged tube distilling plant will cause _____.

first effect scale formation to be loosened

pressure and temperature fluctuations in the entire unit

increased heat levels throughout the entire unit

decreased priming and lower salinity distillate

B

53. In a refrigeration system, the amount of superheat absorbed by the refrigerant is adjusted at the _________.

condenser expansion valve evaporator compressor B


54. Salinity cell is installed in the distilling unit to indicate the______.

quantity of freshwater produced

leaking tube amount of chemical to be added

quality of water produced

D

55. In the refrigeration system, the refrigerant absorbs the latent heat of vaporization in the______.

evaporator compressor condenser liquid receiver A

56. In a low pressure air compressor, the loss of volumetric efficiency normally results from________.

heating of the air leaving the cylinders

adiabatic compression in the intercooler

inaccurate valve timing

constant enlargement of the clearance expansion volume

A

57. Air compressor cylinder unloader enable the compressor to_______.

vary their speed according to temperature and load

change speed according to overload demands

reduce compressed air charge density

start and come up to speed before air compression begins

D

58. Fuel oil enters the main engine cylinder through ______________.

plunger and barrel starting valve fuel oil injector oil spill valve C

59. The expansion tank for the jacket cooling water which is a closed cooling type is used to ___________.

maintain constant head in a system

allow easy release of air

prevent water leakage

reduce air contamination

A

60. Which of the following descriptions best identifies the operating principle of a flash-type evaporator?

Sea water is heated to boiling temperature while under a vacuum.

Sea water is passed over heated plates in a thin film.

Sea water is forced through a heated eductor

Heated sea water is injected into a vacuum chamber

D

61. A mooring winch should be equipped with mechanical brakes capable of holding_____.

50% over the working tension of the mooring line

the full breaking strength of the mooring line

half the breaking strength of the mooring line

the maximum expected tension of the mooring line

B


62. The degree of fuel atomization in a diesel engine cylinder depends primarily on _______.

timing of the pump supply pressure to the pump

shape of the combustion chamber

the size of the holes in the fuel nozzle

D

63. The thermostatic expansion valve of a refrigeration system is opened ____________.

by refrigerant pressure and close by spring pressure

by spring pressure and close by refrigerant pressure

and close by spring pressure

and close by refrigerant pressure

A

64. Boyle's law can best be defined as _________.

the volume of an enclosed gas varies inversely with the applied pressure, provided the temperature remains constant

if the pressure is constant, the volume of an enclosed gas varies indirectly with absolute temperature

a body at rest tends to remain at rest.

None of the stated options

A

65. Kinetic energy is associated with _________.

heat movement and relative velocity

degree of atomic and molecular motion

relative position in respect to datum reference level

B

66. The "general energy equation" expresses energy in which of the following forms?

thermal potential kinetic All of the options D

67. The Brayton Cycle is one where the combustion event occurs at __________.

constant temperature

increasing pressure

constant pressure All of the options C

68. Heat is defined as _________. stored potential energy

thermal energy in transition

stored kinetic energy

All of the options B


69. Which of the following statements is NOT one of Newton's laws?

A body at rest tends to remain rest and a body in motion tends to remain in motion.

For every action there is an equal and opposite reaction.

If the pressure is constant, the volume of an enclosed dry gas varies directly with the absolute temperature.

An imbalance of force on a body tends to produce an acceleration in the direction of that force which is directly proportional to the applied force and inversely proportional to the mass of the body.

C

70. A theoretical engine cycle is a process that _________.

takes place in the combustor of the engine

begins with certain conditions, progresses through a series of additional conditions and returns to the original conditions

begins with certain conditions, progresses to a steady state and stays there


B

71. Rotating flyweights acting against a spring force makes up a simple type of __________.

governor reducing valve safety valve feedwater regulator

A

72. It is the state of a system wherein no heat flow takes place between its components.

Thermal unsteady state

Thermionic state Thermal equilibrium

Thermal temperature

C


73. Which of the following represents the definition of energy?

energy is work that has been completed

energy is the capacity of work being done

energy is the capacity for producing and effect

energy is produced power

C

74. Which of the following statement is true about the laws of friction?

the magnitude of the force decrease up to a limiting value

the force is independent of the area of contact

friction acts so as to attract the motion of one body relative to another

the frictional force is greater than if motion is just to take place

B

75. Kinetic energy is the energy of the body has due to its

position temperature motion horsepower C

76. Work is conveniently expressed in: pounds per minute kilograms per minute

kilogram meter foot-pounds per minute

D

77. Power is the work done as 33,000 ft. pounds 2450 kilogram per unit of time work times distance

C

78. Vacuum refers to pressures 34 inches of mercury

31 inches of mercury

below atmospheric zero gauge C

79. Specific heaat of a substance is defined as the heat required to raise the temperature of

1 lb. of it to 1oC 1 kg. of it to 1oF 1 lb. of it to 1oF 10 lbs. of it to 1oF C

80. Too high alkalinity of boiler waer may cause

scale corrosion caustic embrittlement

acidity A

81. The number of cubic feet of fresh water that wil weigh one ton is

62 cu. Ft. 35.84 cu. Ft. 24.5 cu. Ft. 30.4 cu. Ft. B

82. The pressure due to a column of H2O one foot high is

.491 lbs/sq. in .434 lbs/sq. in .5 lbs/sq. in .625 lbs/sq. in B

83. Specific heat of water is: 1 10oF 100oC 212oF A


84. Latent heat of evaporation of water is

100 BTU per lb 212 BTU per lb 100 calories per 970 BTU per lb. D

85. 23oC reads in absolute degrees centigrade as

123o AC 146o AC 276o AC 296o AC D

86. A pressure reading of 00.0 psig is theoritically equal to

14.7 psia 30.0 inches of water

30.0 inches of vacuum

00.0 psia A

87. Vacuum refers to pressures as 34 inches of mercury

32 inches of mercury

zero gauge below atmoshpheric

D

88. A motor ship cruising at average speed of 14.55 knots/hr. How far could it travel in one and one half day?

480.15 miles 356.47 miles 523.80 miles 494.70 miles C

89. In a Roots-type rotary blower, the volume of air delivered is directly proportional to __________.

engine speed engine load brake horsepower brake specific fuel consumption

A

90. Enthalpy is the number of heat energy a sustance contains above

100 degree celsius 32 degree farenheit

0 degree farenheit 212 degree farenheit

B

91. A mechanical and or hydraulic actin that prevents over correction of the energy medium supply in a governor which produces transient speed droop during a speed correction is known as

Stability compensation dead brand sensitivity B

92. What pressure is usually carried on a gland sealing system

6 to 8 LBS gauge pressure




D

93. The temperature at which a vapor liquifies is called

dew point condensation point vaporation point moisture point B

94. A`reversable adiabatic process is also called:

isobaric isometric isentropic isothermal D


95. A 200 PSI new boiler should be subjected to a hydrostatic pressure of

400 PSI 300PSI 500 PSI 250 PSI B

96. Steam which is in physical contact with the boiling water from which it has been generated is termed:

unsaturated team pure steam wet steam saturated steam D

97. Saturated steam is a steam that has temperature at boiling point

contains moisture has temperature above boiling point

contains no moisture

B

98. Torque is a force which tend to produce

compressive power

work rotation stress D

99. Boiler horsepower is equivalent to 33,000 ft. lb. 33,475 BTUper hour

30,000 BTU per hour

30,000 ft. lbs. per minute

B

100. Absolute pressure is accurately indicated by

bourdon gauge mechanical gauge manometer barometer C

101. The process of changing a solid to a liquid is called the latent heat of

vaporization evaporation fusion condensation C

102. The proper treatment for shock is: raise the head give th victim warm liquid

keep the boy cool raise the feet D

103. Heat extracted in the process of changing a liquid to a solid is called the latent heat of

solidifcation fusion evaporation vaporization B

104. What is the principle which states that buoyant force acting on a body partially or completely immersed in a fluid is equal to the weight of fliud displaced?

Archimedes principle

Parallelogram Principle pf transmissilibility

Advance coefficient

A

105. A turbine is mecanical device, which produces work by converting__________.

potential energy into thermal energy

kinetic energy into thermal energy

thermal energy into kinetic energy

thermal energy into potential energy

C


106. According to the fuel used this type of engine uses hih grade of fuel which is highly flammable __________________.

Internal combustion engine

External combustion engine

Diesel engine Gasoline engine D

107. An engine which run with petrol (or paffin) as the fuel are sometimes called as ____.

Internal combustion engine

Light oil engines Gasoline engine Petrol engine B

108. At pressure of 1.013 bar, or atmspheric pressure at sea level, water boils at _______.

373 K 100 F 66 C 87 C A

109. Find the area of a single cylinder engine whose piston diameter is 8.89 centimeters ___.

79.12 cm2 19.60 cm2 62.14 cm2 54.78 cm2 B

110. Heat exchanger used to heat the boiler feed water by means of waste gas as it passes thru series of tubes to the stack.

close condenser economizer oil heaters fresh water heat B

111. It is a series of events repeated in the same regular events________________.

cycle revolution stroke ratio A

112. It is defined as a product of the force and the distance travelled by the force measured along the line of action of the force .

energy work transfer acceleration heat transfer B

113. It is part of the engine that lowers the revolution of the main engine in relation to the driven shaft speed ____.

Engine flywheel Thrust bearing Reduction gear Vibration damper C


114. It is scavenge system in a four stroke diesel engine where the intake and exhaust systems are controlled by intake and exhaust valve attached at the cylinder head ___.

Uniflow Cross flow Forced flow Loop flow D

115. It is study of the relationships between heat energy, work and the properties of matter, also of the conversions of heat energy and work by means of heat engines.

energy system applied heat boundary C

116. It is the hotness or coldness of the body.

intensity quantity energy potential energy A

117. __________ is the ratio of the volume of fuel charge at the beginning of the compression to the voulme at the end of compression .

compression stroke

Volume ratio Compression ratio Power stroke C

118. It is the tranfer of heat energy from one molecule to molecule

radiation conduction convection combination of conduction and convection

B

119. It is the transfer of heat energy through air,space, or vacuum.

evaporation radiation covection conduction B

120. Superheated steam is used in main turbine propulsion plants because superheated steam has ______.

Less specific volume per pound than saturated steam

Less specific energy than saturated steam

Greater pressure than saturated steam

Greater heat energy per pound than saturated steam

D


121. The gas law represented by formula PV/T= constant is _____.

Charles' Law Boyles' Law Combination Gas Law

Standard Gas Law C

122. The kind of heat involves a transformation of matter from one physical state to anoter without changing its temperature.

latent heat applied heat heat energy latent heat of condensation

A

123. The main engine RPM must be lowered so that it will conform wit te RPM design of the propeller. This can be done by the installation of a _______.

Thrust bearing Vibration damper Turning gear Reduction gear D

124. The quantity of heat is affected by the amount of _____ that is present in the substance heated.

mass molecules atoms weight A

125. The speed of the ship's propeller through the water is 12.5 knots, however due to slip, the sip covers a distance of only 287 nautical miles in 24 hours. Calculate what percentage of the propeller speed does the slip represent?

10% 7.00% 6.80% 4.80% D

126. The volume swept by the piston from top dead center to bottom dead center is called__________.

compression ratio piston displacement

length of stroke swept volume B

127. This is the distance travelled by the piston from top to bottom or bottom to top ____.

Top dead center Revolution Bottom dead center

Stroke D

128. This is the temperature of a liquid in which boiling occurs?

saturation temperature

superheated temperature

vaporization latent heat A


129. This kind of heat involves a transformation of matter form one physical state to another without changing its temperature.

latent heat of fusion

applied heat sensible heat latent heat of vaporization

D

130. This type of heat when added to a substance, it will result to a change in physical state without changing its temperature.

sensible heat latent heat latent heat of fusion

laten heat of vaporization

A

131. Turbulence is created in the cylinder in the cylinders of a diesel engine to ____________.

obtained injection lag

help mix fuel and air

increases combustion pressures

decreases combustion pressures

B

132. Two governors on diesel engines driving the same load require which of the following characteristics?

Speed droop and isochronous

Speed droop and high sensitivity

Isochronous and high sensitivity

Speed droop, isochronous and high sensitivity

D

133. What are the product of kinetic viscosity and the density of the oil at the temperature

Absolute density Absolute viscosity Kinematics viscosity

Viscosity index B

134. What is the equivalent of zero (0) Kelvin to degrees centrigade?

-273 C -460 C -32 C -180 C A

135. What kind of heat must be added to convert and ice (solid heat) to water (liquid state)?

latent heat of fusion

sensible heat latent heat of vaporization

applied heat A

136. When you are starting a diesel engine at temperature below 70 deg. F the functional resistance to turning will be ______.

Reduce by increasing lube oil pressure

Controlled by reducing the compensation ratio

Directly proportional to lube oil viscosity

Eliminated by eatin gthe intake air

C


137. With a decreasing scavenging air pressure and increasing scavenging air temperature, the specific fuel consumption of the engine will:

remains constant not affect the engine performance

be reduced increased D

138. With referrence to anti-corrosive zincs when you do replace it with new one in case of sea water cooling engine?

If the zinc became less than 40% of its original size

If the zinc became brittle at the time of inspection

If the zinc became less than 15% of its original size

If the zinc have been in use for the last six months

A

139. With temperature held constant of a perfect gas , then the volume of a given mass is inversely proportional to the pressure of the gas is inversely proportional to the pressure of the gas

combination gas law

Charle's Law Boyle's Law Standard Gas Law C

140. During a change in temperature, the heat involved is known as ___________

sensible latent total residual A

141. If the pressure indicates 30 PSI what will be the equivalent in kgs/cm2?

1.8 2.1 2.8 3.1 B

142. It is the equivalent reading in Fahrenheit if the temperature reading is -40 degrees Celsius.

-32 -40 +32 +40 B

143. The pressure gauge indicates 2.5 kgs. Per cm2. What will be the pressure equivalent in pounds per square inch ( PSI )?

35.5 38.6 42.8 45.5 A


144. The relationship between viscosity and specific gravity is ___________

Liquids with different viscosities will always have the same specific gravity

Liquids with different viscosities will never have the same specific gravity

Viscosity and specific gravity are directly proportional

Viscosity and specific gravity are not related in that one does not define or limit the other

D

145. The removing of moisture from air is a process known as _____

humidification dehumidification vaporization evaporation B

146. Power is defined as the __________.

rate of doing work amount of force needed to overcome friction

amount of work accomplished

distance through which an object is moved

A

147. What is a measure of the internal resistance of the fluid to the movement of the plate?

Specific viscosity Absolute viscosity Kinematic viscosity Average viscosity A

148. The push or pull excerted on a body is called ___________.

Inertia Moment Force Motion C

149. What element would thickened the lubricating oil when added?

Bentonite Potassium Zinc Lead A

150. What law staes that if the pressure of a confined gas is constant, the volume is directly proportional to the absolute temperature?

Dalton's law Kirchoff's law Law of Heat flow Charle's law D

151. In chemical notation a small suffix is used with the (symbol) letter to indicate the number of_________.

Atoms Molecules Weight Mass A

152. What is the distance from the centroidal axis of an area at which the entire area could be concentrated?

Moment of inertia Moments of gyration

Mass moment of inertia

Mass of moment of composite bodies

C


153. The property of the body which resist changes in its state of rest or uniform motion in a straight called__________.

Kinetic energy Potential energy Inertia Radius of gyration C

154. Which of the following describes the purpose of a striker of double plate?

It provides landing surface for the sounding bob of a tank sounding tape

It provides to absorb machinery vibration

It provides a surface for the application of force

It provides to prevents valve stem over travel

A

155. What is the approximate composition of air by mass?

23% oxygen and 77% nitrogen

27% oxygen and 73% nitrogen

23% oxygen 77% hydrogen

27% oxygen and 73% hydrogen

A

156. A tonnage tax is levied according to the (NOT ENGINEERING QUESTION) INVALID

Gross tonnage of vessel

Maximum deadweight cargo tonnage on board

Displacement tonnage of the vessel

Net tonnage of vessel

D

157. What is the chemical symbols for fuel butane?

C4H10 C3H8 C2H6 C7H16 A

158. What is a measure of the rate on motion or speed of a body at any instant?

Inertia Velocity Kinetic energy Energy B

159. What is a measure of the tendency of a force acting in oppose along separate parallel lines of action?

Moment of force Couple Torque Twisting moment B

160. What is the usual unit for moment of inertia of an area?

Millimeter square Millimeter cube Millimeter to the fourth power

Millimeter to the power

C

161. An object that is subject to a force for a very short time is said to have received a/an _________.

Momentum Force Impulse Inertia B


162. What is the property of a body which causes it to (tend ) remain in its existing state of rest or motion until acted by some force tending to change its existing state?

Velocity Kinetic energy Gravity Inertia D

163. What is considered in mechanics as the factor which tends to produce, modify or retard motion?

Force Power Work Weight A

164. What is the relationship between viscosity and specific gravity?

Viscosity and specific gravity are directly proportional

Liquids with different viscosities will never have the same specific gravity

Different viscosities will always have the same specific gravity

Viscosity and specific gravity are not related in that one does not define or limit the other

D

165. What element contain in the fuel that takes no active parts during combustion in an Internal Combustion Engine?

Oxygen Nitrogen Hydrogen Carbon B

166. Calcualte the area of ships steel plate measuring 1.8 meter wide and 6 meter long.

8.10 m2 8.01 m2 10.8 m2 10.9 m2 C

167. The turning moment which is the product of a tangential force and the distance it acts from the axis of the rotation is called ___________.

Torque Friction Torsion Twisting moment A


168. What is the measure of the amount of solids classified as asphalts on carbon residue contained in an oil?

Neutralization number

Precipitation number

Total base number Carbonized number

B

169. What could result in fuel oil having a low octane rating?

Improved cold weather starting

Excessive fuel consumption

Reduced ignition lag

Smoother engine operation

B

170. As we heat a gas at constant pressure, what happen to its volume?

Increases Decreases Stays the same Comparable to the initial volume

A

171. The ratio of the absolute viscosity of oil to the specific gravity of oil is called ______.

absolute viscosity specific viscosity kinetic viscosity average viscosity B

172. The viscosity of the lube oil is rated in which of the following?

Second millimeter universal

Saybolt minutes universal

Saybolt second universal

Saybolt millimeter universal

C

173. Determine the weight of a rectangular piece of 25.5 lbs. steel measuring 4.5 feet by 6.7 feet.

591.2 lbs. 329.9 lbs. 768.8 lbs. 285.6 lbs. C

174. What is chemical symbol for fuel propane?

C3H8 C7H16 C3h8 C7H16 A

175. What is the ratio of fuel oil density to the density of water?

Viscosity index Specific gravity Latent heat Base number B

176. In diesel engines, which of the following is an equivalent of one horsepower?

0.5457kw 0.6457kw 0.7457kw 0.8457kw C

177. The horsepower and speed capability utilized by the engine without interruption is the ___ rating:

Maximum rating Intermittent rating Continuous rating Overall rating C


178. A perfect vacuum is represented by gauge reading of ___________

30 in. Hg 24 in. Hg 15 in. Hg 10 in. Hg A

179. Solve the following equation: 2x + 5y= 20; Given y=5. Find the value of x?

-2.5 3.5 -4.5 5.5 A

180. If a continuous and steady flow of lube oil is provided, which of the listed pressures represents the lowest supply pressure at which a small high-speed bearing can be safely lubricated?

1 psig 5 psig 10 psig 15 psig A

181. Which of the significant combustible elements of fuel oil is a major source of air pollution?

Hydrogen Nitrogen Vanadium Sulphur D

182. The power developed within the engine cylinder and can be measured by an engine indicator called ______________.

indicated power shaft power brake horse power torsion power A

183. What is the ratio between the energy developed at the brake of the engine and the energy supplied?

Brake thermal efficiency

Mechanical efficiency

Scavenge efficiency

Volumetric efficiency

A

184. Isentropic compression is sometimes known as

constant volume compression

constant temperature compression

constant universal pressure compression

constant entropy compression

A


185. What is similar to volumetric efficiency but used to described 2-stroke engine where some gas maybe included with the air at the start of compression?

volumetric efficiency

scavenge efficiency

mechanical efficiency

thermal efficiency B

186. The completely insulated system is operated in ______________.

isothermal process the junction polytrophic process

adiabatic process the isentropic process

C

187. It is defined as the capacity for doing work?

Energy Resistance Velocity Inertia A

188. In actual gasses, the molecular collisions are_____________.

only dependent on the momentum

inelastic plastic not visible nor known

B

189. Demulsibility is defined as _________________.

the ability of an oil separated from water

the measure of the water in the lube oil

the temperature at which oil flows rapidly

an emulsion of different oil grades

A

190. A measure of resistance to rotational acceleration called _____________.

moment of inertia mass moment of inertia

radius of gyration mass moment of inertia to composite bodies

B

191. Any liquid with a flash point above 80 is a ______________.

flammable liquid combustible liquid coal base oil synthetic base oil B

192. What is more nearly practical process?

Polytrophic operation

Isothermal operation

Adiabatic operation

Poly-is operation A

193. The acceleration of the body is directly proportional to the force applied to it inversely is known as ______________.

the law of inertia Newton's second law

mutual inductance law

Newton's law of action and reaction

B

194. What is the other name of inertia of an area?

Third moment of area

Dimensional moment of area

Second moment area

Sectional moment of area

C


195. In the conservation of energy the heat rejected must be equal to _______.

heat added heat output heat partially added

heat not in thermal conductor

A

196. It is the usual unit for moment of inertia of an area millimeter?

Square Cube To the fourth power

To the fifth power C

197. What is a compression ratio? Ratio of the piston displacement plus clearance

Volume clearance Piston clearance Ratio of the piston and liner

A

198. The transfer of heat through electromagnetic flue wave an always travel with the gas is called the _________________

radiation heat transfer

volt-amp transfer thermal convection

universal conduction

A

199. Which of the following modes of heat transfer does NOT require any physical contact between a warmer and a cooler substance?

Radiation Conduction Natural convection Any of the options A

200. Which of the following statements is correct concerning heat transfer?

Heat is given off from a high temperature region known as a heat sink

Heat transfer rate is affected most by the size of the heat sink involved

Heat transfer rate is affected most by the temperature difference between the heat source and the heat sink

Heat transfer by radiation will only by mass motion of a fluid substance

C


201. Which of the following statements is correct regarding Archimedes principles stating that the resultant pressure acting on a body when immersed in a fluid?

Acts vertically upward through the center of gravity of the displaced fluid and is equal to the weight of the fluid displaced

Will cause the body to have a reduction in mass equal in magnitude to the effective mass of the structure located above the line floatation

Is proportional in magnitude and direction, regardless of the direction originally developed when the object was submerged

Is applied equal and in all directions throughout the vessel in which it is Contained

A

202. The heat required to raise the temperature of 1 pound of any particular substance 1 F is called ______________.

its specific heat its latent heat a British thermal unit

its adiabatic heat A

203. Demulsibility of lube oil is defined as ______________.

the ability of oil to separate from water

the temperature at which oil flows rapidly

a measure of the water in a lube oil system

an emulsion of different grades of oil

A

204. Which of the following conditions must exist for heat to flow from one object to another?

the two objects must be in physical contact

the two objects must be the same size

there must be an existing temperature differential

there must be an existing weight differential

C

205. The ratio of the weight of moisture contained in a given volume of air, to the weight of moisture that the same sample would hold if saturated, and expressed in grains called the _______________.

absolute humidity relative humidity specific humidity total humidity A


206. In the production of freshwater from seawater through a process of heating and cooling, the cooling phase of production is usually called ______.

evaporation distillation dehydration condensation D

207. Which of the following listed methods may be heat transferred from one body to another?

Radiation Convection Conduction all of the options D

208. Which of the following statements represents the function the nozzle assembly performs in an impulse turbine?

Converts the steam's thermal energy into kinetic energy by increasing its velocity, and directing if against the rotor blades

Provides an area where the steam is prevented from expanding prior to being directed against the rotor blades

Increase the velocity of the steam without a pressure drop across the impulse blading

Converts the potential energy of steam thermal energy by increasing its velocity and directing it against the turbine bladders

A

209. When air contains some moisture, but is not saturated; the dew point temperature is

between the wet and dry bulb temperature

equal to the total heat of air

higher than the wet bulb temperature

lower than the dry bulb temperature

D

210. Which of the listed statements best describes specific heat?

The amount of heat required to change the temperature of one pound of a material, one degree

The amount of heat required to change the temperature of one pound of ice, one degree F.

The amount of heat required to change the temperature of one pound butter, one degree F material, one degree

All of the options D


211. Which of the following statements best describes the phrase "the heat of respiration"?

The total amount of heat the body is absorbing when undergoing CPR

The heat produced through the formation of carbon dioxide when harvested plant life absorbs oxygen

The heat developed by air as it flows through inlet air filters in a operating diesel engine

The heat developed by air as it flows through the air filters of an operating reciprocating compressor

B

212. What is the potential energy of an object weighing 10 pounds at a height of 10 feet?

10 ft-lb 20 ft-lb 100 ft-lb 1000 ft-lb C

213. Which of the effects listed describes the changers in the velocity and pressure of the steam as it passes through a nozzle?

Velocity increases and pressure increases

Velocity increases and pressure decreases

Velocity decreases and pressure increases

Velocity decreases and pressure decreases

B

214. How much work would be accomplished if a 15 pound box were raised to the top of a 25 foot platform?

15 ft-lb 25 ft-lb 40 ft-lb 375 ft-lb D

215. Thermal energy in transition is also referred to as ______________.

heat power horsepower foot-pound A

216. The equation "energy out" is a simple way stating the principle of the ____.

conservation of energy

conservation of matter

conversion of matter to energy

conversion of energy to mater

A

217. Which of the following statements represents the definition of energy?

Energy is work that has been accomplished

Energy is the capacity for producing an effect

Energy is work being done

Energy in power B


218. A measurement of .625 is equal to _____________.

1/2 inch 9/16 inch 5/8 inch 3/4 inch C

219. An additive used to improve the ability of a lube oil to reduce friction is known as a/an __________.

suppressant additive

dispersant additive extremely pressure additive

viscosity improper additive

C

220. Which of the following best describes the effect on the pressure and volume relationship with regards to saturation gases?

As pressure decreases, volume increases

As volume increases, pressure increases

As volume decreases, pressure decreases

As pressure increases, volume increases

A

221. Which of the processes listed consumers the greatest amount of power and produces the greatest amount heat?

Overcoming sliding friction

Overcoming rolling friction

Overcoming fluid friction

Overcoming oil wedge friction

A

222. The tendency of a liquid to vaporize is indicated by its _____________.

fire point pour point flash point boiling point C

223. The theoretical minimum compression ratio necessary to ensure compression ignition in a direct injection diesel engine is _______________.

0.334027778 0.418055556 0.500694444 0.584027778 B

224. The quality of heat required to raise the temperature of a unit mass of a substance is known as ________________.

latent heat sensible heat of condensation

specific heat variable heat C


225. How many fathoms is the equivalent of one shot when measuring the ship's anchor chain?

15 6 12 3 A

226. For safety reasons, the most important chemical or physical property of fuel and lubricating oils to consider when heating them before use is their. _________.

density calorific value viscosity flash point D

227. It is considered the smallest tank constructed on board world wide vessels that is being used for heavy fuel oils.

Collecting Storage Settling Service A

228. At pressure of 1.013 bar, or atmospheric pressure at sea level, water boils at ____________.

373 K 100 F 66C 87C A

229. What is the main purpose of lubrication?

To reduce wear and tear

To carry heat away from moving parts

To create free passage of oil

To increase efficiency of engine

A

230. The maintenance of the oil film of a lubricant is affected by the____________.

thinner grade of oil working temperature of the engine

excessive "drag" of the moving parts of the engine

thicker grade of oil B

231. Which of the following statements is true regarding mechanical seals?

Mechanical seals maybe used in lieu of conventional packing for any service other than saltwater

Mechanical seals are not suitable for use on fuel oil transfer pumps

By adjusting spring compression leakage may be reduced

Mechanical seals are normally lubricated and cooled by the fluid being pumped

D


232. Under the type of lubrication what do you call the condition where some lubricant is present but the two bearing surfaces in relative motion are not completely by the film of lubricant?

Boundary or "thin film" lubricant

Fluid or "thick film" lubrication

Lubrication and viscosity

Reducing friction and wear

B

233. What grade of oil may cause a breakdown of the oil film, resulting in rapid wear and possible seizure of the working parts?

Thin Heavy Thick Viscous A

234. The property of oil that concerns the ease with which an oil flows through the oil pipe lines and spreads over the bearing surfaces is called_______________.

flow quality viscosity pour point flash point A

235. What is the equivalent of zero(0) degree Kelvin to degree centigrade?

-273 -460 -32 -180 A

236. In general if heat is added to a substance, the temperature of the substance will increase and if heat is taken away the temperature will______________.

remain the same gradually remain decrease be transferred C

237. It is known as the series of events repeated in the same regular events.

Revolution Stroke Cycle Ratio C


238. What will be the probable caused of lube oil from main propulsion machinery having an increases neutralization number?

acidity has increased

viscosity has decreased

demulsibility has improved

tendency to foam is guaranteed to occur

A

239. The detergent are used in lubricating oils MAINLY to ________________.

reduce the viscosity number

prevent oxidation of the oil

reduce foaming prevent sludge deposits

D

240. What is the best way of checking heat cracks?

By using magnetic particle test

By using x-ray By applying pressure test

By using dye penetrants

A

241. A high reading of 100 or more viscosity index given to an oil indicates a ______________.

contamination of oil being use

large variation in viscosity with temperature change

small variation in viscosity with temperature change

high quality of oil C

242. An oil additive used or added to keep oil fluid at low temperature is_________________.

pour point despersant

anti-foaming additive

dispersants viscosity index improver

A

243. One of the factors that affect the air-conditioning load is______________.

corrosion solar radiation magnetic field heat transmission B

244. The lube oil temperature leaving the lube oil coolers is regulated by throttling the__________.

cooling water outlet valve

cooling water inlet valve

lube oil outlet valve

lube oil return flow valve

A

245. What is the equivalent of zero(0)degree Kelvin to degrees centigrade?

_273C _460C _32C _180C A

246. It is the type of heat when added to a substance, will cause an increase in temperature without changing it physical state.

Sensible heat Latent heat latent heat of fusion

Latent heat of vaporization

A


247. In a compression type automatic grease cup, the lubricant is forced into the bearing by __________.

gravity flow spring force a pressure gun a zerk fitting B

248. With reference to a vessel's structural integrity, the most significant characteristic of a cryogenic liquid is its __________.

capability of causing brittle fractures

highly corrosive action on mild steel

vapor cloud which reacts violently with saltwater

toxicity at atmospheric pressure

A

249. The heat required to change a substance from a solid to a liquid while at its freezing temperature, is known as the latent heat of __________.

fusion vaporization condensation sublimation A

250. The heat required to change a substance from a liquid to a gas without experiencing a temperature change, is defined as the latent heat of __________.

fusion vaporization sublimation condensation B

251. The portion of a hydraulic hose that determines its overall strength, is the __________.

inner tube braided inner layers)

outer cover outer armor B

252. A weight of 1,000 kips is equivalent to __________.

1,000 pounds 2,000 short tons 2,240 pounds 500 short tons D

253. The size of flexible hose used in a hydraulic system is indicated by __________.

the inside diameter of the tube

the numerical designation found on the 'skin' of the hose

a color code on the armor

the thickness of the tube wall

B


254. Latent heat can be defined as the heat which must be added to a substance in order to change it from a __________.

solid to liquid liquid to vapor solid to vapor All of the options D

255. A pressure reading of 00.0 psig is theoretically equal to __________.

30.0 inches of vacuum

300 millimeters of water

14.7 psia 00.0 psia C

256. Which of the listed chemicals can be routinely used to maintain the hygienic quality of potable water?

Hydrochloric acid Chlorine Sulfuric acid Zinc chromate B

257. An organic solid lubricant, such as graphite, is suitable as an oil additive when used in __________.

machinery bearings subjected to high temperatures

antifriction bearings on general service pumps

bearings subject to fluctuating loads

line shaft bearings A

258. For the various sizes of tubing and wall thickness used in a hydraulic system, the inside diameter can be determined if it is remembered that the inside diameter equals the outside diameter less __________.

the wall thickness 1.5 times the wall thickness

2 times the wall thickness

2.5 times the wall thickness

C

259. The greatest difference between absorbent and adsorbent filters is that absorbent filters __________.

will remove additives from the lube oil

soak up liquid contaminants directly into the filter media

do not create pressure drops in the lube oil system

attract or have liquid contaminants stick to the surface of the filter media

B

260. The graphite in a bearing lubricant compound of graphite grease, acts as a __________.

low temperature sealer

moisture barrier filler to smooth surface irregularities

coolant to carry away heat

C


261. What would you do after adding grease to a ball bearing with a handheld grease gun?

You should run the machine with the bearing housing drain plug open for a short while

You should close the bearing housing drain and add a little extra grease to compensate for air pockets in the bearing

You should remove the grease fitting and leave open to allow excess grease to escape

You should save the used grease for chemical analysis

A

262. In addition to a pressure gauge and a relief valve, an air receiver should be fitted with a __________.

sight glass and manhole

thermometer and sight glass

thermometer and manhole

drain connection D

263. The difference between the pressure at a point being measured and that of a perfect vacuum is known as __________.

internal pressure gauge pressure absolute pressure external pressure C

264. An additive used to improve the ability of a lube oil to reduce friction is known as a/an __________.

suppressant additive

dispersant additive extreme pressure additive

PH alkaline additive

C

265. Which of the units of measurement listed below are used to express positive and negative suction heads when calculating pump head or hydraulic horsepower?

Inches of mercury for positive head and feet of water for negative head

Feet of water for positive head and inches of mercury for negative head

Inches of mercury for both positive and negative heads

Feet of water for both positive and negative heads

D


266. The ability of lubricating oils to resist viscosity changes during temperature changes is indicated by the __________.

American Petroleum Institute number

viscosity index number

Seconds Staybolt Furol number

Seconds Saybolt Universal number

B

267. Which of the additives listed is used to reduce the foaming tendency of lube oil?

Emulsifiers Suppressants Depressants Extreme pressure B

268. Which of the following statements is correct concerning the viscosity of lubricating oil?

Viscosity will increase as temperature increases.

Viscosity is a measure of a fluid's internal resistance to flow.

Viscosity will decrease as temperature decreases.

Viscosity is not dependent on temperature.

B

269. The pour point of lubricating oils is affected the most by which of the following?

Extensive centrifuging

Wax content Water content Acid content B

270. The viscosity of an oil is a measure of its __________.

weight internal friction demulsibility S.A.E. number B

271. On vessels using reach rods to manually control the tank valves, one turn of the hand wheel on deck will produce how many turns of the valve stem at the valve?

One-fourth of a turn

One-half of a turn Three-fourths of a turn

One turn D

272. The flash point of most lube oils used in a main lubricating system should be approximately __________.

80F to 100F 140F to 160F 250F to 300F 350F to 450F D

273. Which of the listed characteristics of lube oil are the most important to the engineer from an operational standpoint?

Ash content, carbon residue, and gravity

Viscosity, acidity, and demulsibility

Pour point, flash point, and precipitation number

Autoignition point, viscosity index, and film strength

B


274. A salinity indicating system functions on the basic principle of measuring the __________.

electrical inductance of water

electrical conductivity of water

specific gravity of water

hydrogen ion concentration of water

B

275. Where should an S-type trap and drain properly used?

Used for for all lavatory sink installations, as no other drain type is useable

Used whenever the 'gray' water drain system connection is located in the deck

Used whenever the 'gray' water drain system connection is located in a bulkhead

Used as a condensate drain for superheaters

B

276. The component which is used to thoroughly separate small, fine, dust-like particulate contamination from hydraulic fluid is a/an __________.

accumulator filter separator strainer B

277. The sensible heat of air is dependent upon the __________.

dry bulb temperature

wet bulb temperature

saturation temperature

water vapor superheat

A

278. Which of the following statements describes the relationship between flash point and ignition temperature?

Both are higher than normal burning temperatures.

The flash point is always higher.

The ignition temperature is always higher.

They are not necessarily related.

C

279. When the pressure on a compound gage is released, the gage pointer is returned to zero psig by action of the __________?

Bourdon tube spring return arm compound diaphragm

compensating spring

A

280. A lube oil filter can be used to remove most contaminants from lube oil. What is the contaminant which will remain in the lube oil after filtering?

acid fuel oil sediment water B


281. How can the percentage of impurities in a specific fuel oil sample be determined?

settling in a fuel tank

testing in a laboratory centrifuge

burning in a calorimeter

testing in a closed cup

B

282. Which of the following statements describes the actions of an axial piston motor with a full deflection variable position tilting box?

Control over speed, direction, and stopping would be better than having the pump equipped with the tilting box.

Maximum speed when rotated in the 'hauling in' direction would be obtained with the tilting box just prior to neutral stroke, while 'pay out' would be the opposite.

Maximum torque, when rotated in the 'pay out' direction would be obtained with the tilting box just prior to neutral stroke, while 'hauling in' would be the opposite.

Maximum speed in either direction of rotation would be achieved just beyond of neutral stroke, making reversal of direction difficult.

D

283. A ship travels 234.02 nautical miles in 24 hours at an average propeller speed of 60 RPM. If the propeller pitch is 20.07 feet, what is the propeller slip during this passage?

0.1795 0.2046 0.221 0.262 A

284. What is the equivalent in inches having a reading of .625 inches?

15/32 inches 9/16 inches 5/8 inches 35/64 inches C

285. The disc of a relief valve has an area of 0.85 square inches when seated, lifts at a set point pressure of 250 psi. When the valve lifts, the area of the disc exposed to pressure increases by 20%. At what pressure does the valve reseat?

208 psi 227 psi 231 psi 250 psi A


286. When stopper is inserted into the spout of a closed container in which water has been heated to a temperature of 212F. If additional thermal energy is imparted, what changes will occur to the pressure and temperature inside the container?

both pressure and temperature will rise

pressure alone will rise

temperature alone will rise

only a change of state will occur

A

287. Which of the listed values represents the temperature of saturated vapor for water at a pressure of 14.7 psia?

198F (92C) 212F (100C) 335F (168C) 414F (212C) B

288. The boiling point of water in an open container at sea level is 212F. What will happen to the boiling point when the pressure on the open container is decreased?

increase decrease increase and then decrease

decrease and then increase

B

289. Which of the following terms would best describe the temperature at which a liquid boils at a given pressure?

Degree of saturation

Saturation temperature

Superheated temperature

Degree of superheat

B

290. A vapor under pressure stays in contact with, and at the same temperature as the liquid from which it was generated. What do you call the vapor and liquid in this situation?

equilibrium contact latent contact critical state superheated state A


291. Which of the following conditions must exist for heat to flow from one object to another?

The two objects must be in physical contact.

The two objects must be the same size.

There must be an existing temperature differential.

There must be an existing weight differential.

C

292. Machinery operating features are designed to help conserve energy. Which of the following results will not contribute to energy conservation?

Reduction of friction.

Insulation of hot surfaces.

Lubrication of moving parts.

Elevation of heat exchanger overboard outlet temperatures.

D

293. If 1 Horsepower equals 42.45 BTU's per minute, then the energy required to lift a 1 pound (.454 kg) weight, 778 feet (.24 km), against the force of gravity, What would be the number of BTU's required to raise the temperature ?

1 ounce (28.3 g) of water 1F (.55C)

1 quart (.95 l) of water 1F (.55C)

1 gallon (3.78 l) of water 1F (.55C)

1 pound (.454 kg) of water 1F (.55C)

D

294. Which of the following statements concerning the operation of a single-acting hydraulic ram is correct?

Hydraulic force is applied simultaneously in two directions against the ram by directional ports.

The single-acting ram is both extended and retracted by means of hydraulic force.

The single-acting ram is not retracted by means of hydraulic force.

Hydraulic force applied to a single-acting ram results in a pulling motion.

C

295. Which of the following statements concerning energy is correct?

Energy can be created or destroyed.

Energy may not be transformed.

The total quantity of energy in the universe is always the same.


C


296. What is the quantity of heat required to raise the temperature of a unit mass of a subtance?

latent heat sensible heat specific heat capacity

variable heat C

297. Which of the following terms is used to indicate that the addition of heat will result in a temperature change?

Latent heat Sensible heat Sublimation heat Critical point heat B

298. A machine capable of producing 1650 foot-pounds of work per second is considered to produce how much horsepower?

1 hp 2 hp 3 hp 4 hp C

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