u.s.c.g. merchant marine exam qmed q804 oiler, …. merchant marine exam . qmed . q804 oiler, part i...

National Maritime Center Providing Credentials to Mariners

U.S.C.G. Merchant Marine Exam

QMED

Q804 Oiler, Part I

(Sample Examination)

of 33 Q804 Oiler, Part I

8/31/2017

U.S.C.G. Merchant Marine Exam QMED Q804 Oiler, Part I Illustrations: 16

Choose the best answer to the following Multiple Choice Questions.

1. Traditionally, which of the listed refrigerants has been more suitable than the others for use in a centrifugal refrigeration compressor?

• (A) R-11 o (B) R-12 o (C) Ammonia o (D) Carbon dioxide

If choice A is selected set score to 1.

2. Why can CFC or HCFC refrigerants leaking into a confined space or in limited surroundings cause suffocation?

• (A) Refrigerants are heavier than air and displace oxygen. o (B) Refrigerants lighter than air will rise. o (C) Refrigerants obnoxious odor prevents breathing. o (D) Refrigerants contain an acidic substance.


3. A magnetic strainer is primarily used in diesel engine reduction gear oil systems to remove small particles of __________.

• (A) ferrous materials o (B) Babbitt o (C) copper o (D) acidic materials


4. The process of supplying a diesel engine cylinder with air at a pressure greater than atmospheric is called __________.

o (A) engine displacement o (B) super-aspirating o (C) air injection • (D) supercharging

If choice D is selected set score to 1.


8/31/2017

U.S.C.G. Merchant Marine Exam QMED Q804 Oiler, Part I Illustrations: 16 5. Steam condensed in the air ejector intercondenser, drains to the __________.

o (A) atmospheric drain tank o (B) vent condenser drain tank • (C) main condenser through the loop seal o (D) after condenser drain tank

If choice C is selected set score to 1.

6. Unless the system is designed for such operation, two compressors should not be operated in parallel in a refrigeration system for what reason?

• (A) lubricating oil may be transferred from one compressor to the other o (B) condenser pressure will be too high causing condenser failure o (C) operation of two compressors will overload the expansion valves o (D) the evaporators would fail due to excessively low suction pressure


7. Which of the following reasons represents why the designed compression ratio of a gasoline engine is lower than that of a diesel engine?

o (A) Compression must be low for smooth operation. • (B) The heat of compression is not used as an ignition source of the fuel. o (C) Compression must be low to have effective pre-ignition. o (D) Compression must be low for effective spark ignition.

If choice B is selected set score to 1.

8. What is the purpose of the items labeled "moving blades" located on the illustrated steam turbine? Illustration SE-0003

• (A) Convert the kinetic energy of the steam exiting the nozzle to mechanical energy of rotation. o (B) Convert the potential energy of the steam exiting the nozzle to mechanical energy of rotation. o (C) Change the direction of travel of the steam. o (D) Convert the kinetic energy of the steam exiting the nozzle to potential energy.


9. The boiler shown in the illustration would be classed as __________. Illustration MO-0064

o (A) forced circulation, coil-type o (B) two-pass, water-tube o (C) two-pass, scotch marine • (D) single-pass, fire-tube, scotch marine



8/31/2017

U.S.C.G. Merchant Marine Exam QMED Q804 Oiler, Part I Illustrations: 16 10. Personnel servicing refrigeration systems and subject to the exposure to commonly used

refrigerants should wear what type of personal protective equipment?

o (A) an all purpose gas mask • (B) goggles and gloves o (C) rubber soled shoes o (D) a respirator


11. Which of the following methods is normally used to lubricate bearings in a small high-speed diesel engine?

o (A) Splash lubrication • (B) Pressure lubrication o (C) Sight feed lubricators o (D) Mechanical lubricators


12. In a coil-type forced circulation auxiliary water-tube boiler, __________.

• (A) steam demand response is comparatively rapid o (B) steam is recirculated through heating coils in the boiler o (C) unevaporated feedwater is discharged through the skim tube o (D) steam demand response is slow


13. The component shown in the illustration, labeled "IV", is the __________. Illustration SE-0013

o (A) first reduction gear o (B) low-speed pinion o (C) high-speed pinion • (D) bull gear


14. To minimize corrosion, fuel oil strainer disks, spacers and scraper blades are made of __________.

o (A) brass o (B) copper o (C) iron • (D) monel metal or stainless steel



8/31/2017

U.S.C.G. Merchant Marine Exam QMED Q804 Oiler, Part I Illustrations: 16 15. Makeup feedwater is brought into an operating closed feed system via the __________.

o (A) auxiliary feed pump o (B) main feed pump • (C) condenser vacuum drag line o (D) feed booster pump


16. According to the illustrated diagram, what statement is true concerning the operation of the main condenser hotwell level control device? Illustration SG-0010

o (A) The main condenser hotwell level is controlled by controlling the speed of the main condensate pump.

• (B) The main condenser hotwell level is controlled by throttling the flow in a recirculating line teed off the main condensate pump discharge line and leading back the main condenser.

o (C) The main condenser hotwell level is controlled by throttling the main condensate pump discharge to the main air ejector.

o (D) The main condenser hotwell level is controlled by throttling the main condensate pump suction from the main condenser hotwell.


17. The items labeled "D" in the illustration are the __________. Illustration SG-0025

o (A) high-pressure drain connections o (B) low-pressure steam supply connections • (C) low-pressure drain connections o (D) low-pressure vent connections


18. In a diesel engine jacket water cooler, with sea water cooling the fresh water, the __________.

• (A) jacket water pressure should always be greater than the sea water pressure o (B) jacket water pressure must always be less than the sea water pressure o (C) jacket water temperature must always be less than 60°F o (D) sea water temperature must never be warmer than 40°F


19. In order to take suction on the lube oil drain tank cofferdam with the bilge pump shown in the illustration, how many suction side valves must be open? Illustration GS-0042

o (A) One • (B) Two o (C) Three o (D) Four



8/31/2017

U.S.C.G. Merchant Marine Exam QMED Q804 Oiler, Part I Illustrations: 16 20. Which of the following descriptions best identifies the operating principal of a flash type evaporator?

o (A) Sea water is heated to boiling temperature while under a vacuum. o (B) Sea water is passed over heated plates in a thin film. • (C) Heated sea water is injected into a vacuum chamber. o (D) Sea water is forced through a heated eductor.


21. If a diesel engine has been stopped because of piston seizure due to severe overheating, the crankcase __________.

• (A) inspection covers should not be opened until the engine has cooled o (B) scavenge pump should be immediately secured to prevent loss of lube oil o (C) ventilation system should be continued in operation for one hour for cooling o (D) explosion covers should be opened slightly to provide extra ventilation


22. If manual control of the water level in a steaming boiler is required, the proper method of control is with the auxiliary feed __________.

o (A) pump pressure control • (B) stop-check valve o (C) stop valve o (D) pump speed control


23. For the typical marine turbocharged main propulsion diesel engine, where is the usual location for the air intake filter and silencer?

o (A) The air intake filter/silencer usually is local to the engine and surrounds the circumference of the turbocharger turbine inlet.

o (B) The air intake filter/silencer usually is remote from the engine and is mounted in a protected area above the weather deck.

• (C) The air intake filter/silencer usually is local to the engine and surrounds the circumference of the turbocharger blower/compressor inlet.

o (D) The air intake filter/silencer usually is remote from the engine, but still in the engine room mounted on a convenient bulkhead.



8/31/2017

U.S.C.G. Merchant Marine Exam QMED Q804 Oiler, Part I Illustrations: 16 24. As shown in the illustrated D type single furnace boiler, what does item "E" represent? Illustration

SG-0008

o (A) Riser tubes • (B) Downcomer tubes o (C) Upcomer tubes o (D) Support tubes


25. Which of the following desalination plants will always require a sterilizer when providing water to a potable water system?

o (A) Submerged tube type unit o (B) Titanium plate type unit • (C) Reverse osmosis type unit o (D) Multi-stage flash type unit


26. What type of bearing is shown in the illustration? Illustration SE-0012

o (A) Plain thrust bearing • (B) Pivoted shoe thrust bearing o (C) Pivoted shoe journal bearing o (D) Tilting pad journal bearing


27. According to the illustrated diagram, what is the correct sequential order of heat exchangers that the main condensate pump pumps condensate through? Illustration SG-0010

o (A) Main air ejector condenser, deaerating feed tank, first stage feed heater, gland exhaust condenser.

• (B) Main air ejector condenser, gland exhaust condenser, first stage feed heater, deaerating feed tank.

o (C) Main air ejector condenser, first stage feed heater, gland exhaust condenser, deaerating feed tank.

o (D) Main air ejector condenser, deaerating feed tank, gland exhaust condenser, first stage feed heater.



8/31/2017

U.S.C.G. Merchant Marine Exam QMED Q804 Oiler, Part I Illustrations: 16 28. The primary function of the device illustrated is to __________. Illustration GS-0029

• (A) remove all but the frictional load of an air compressor at start-up o (B) precharge the cylinders of an air compressor prior to the start-up of the unit o (C) open the discharge valves during the compressors' operation to supply compressed air o (D) intensify the pressure developed by an air compressor during its normal running operation


29. The power consumed during the scavenging process of a diesel engine is known as the __________.

o (A) compression loss o (B) valve loss o (C) back pressure loss • (D) pumping loss


30. The maximum pressure developed by a waste heat boiler is determined by the main engine exhaust __________.

o (A) gas composition • (B) gas temperature o (C) pressure o (D) timing


31. According to the illustrated diesel engine fuel treatment and fuel service systems schematic, what is the purpose of the device labeled "viscosimeter"? Illustration MO-0077

o (A) It controls the speed of the booster pump for the purpose of controlling the fuel oil viscosity supplied to the fuel injection pumps of the main engine.

o (B) It measures the viscosity of the fuel oil being delivered to the fuel injection pumps of the main engine. It is used for indication only and not control.

• (C) It controls the steam flow through the final heater for the purpose of controlling the fuel oil viscosity supplied to the fuel injection pumps of the main engine.

o (D) It controls the position of the three-way mixing valve for the purpose of controlling the fuel oil viscosity supplied to the fuel injection pumps of the main engine.



8/31/2017

U.S.C.G. Merchant Marine Exam QMED Q804 Oiler, Part I Illustrations: 16 32. Diesel engine jacket water is used in the fresh water distillation process as the __________.

o (A) primary means of producing a vacuum within the distiller • (B) means of heating the feedwater o (C) coolant for the brine cooler o (D) coolant for the distillate


33. Which of the tanks, shown in the illustration, supplies fuel to the emergency generator? Illustration MO-0058

• (A) Light fuel oil service tank o (B) Light fuel oil settling tank o (C) Light fuel oil boiler tank o (D) Light fuel oil booster tank


34. Why are two fuel oil heaters "E" provided in the fuel oil system shown in the illustration? Illustration SG-0009

o (A) To allow fuel of different temperatures to be provided to each boiler. o (B) Two heaters are necessary when both boilers steam at full load. • (C) To provide a backup in case one of the heaters becomes inoperable. o (D) Each heater supplies fuel to a different boiler.


35. By which of the listed methods may heat be transferred from one body to another?

o (A) Convection o (B) Conduction o (C) Radiation • (D) All of the above



8/31/2017

U.S.C.G. Merchant Marine Exam QMED Q804 Oiler, Part I Illustrations: 16 36. What statement is true concerning the charge air system of a modern turbocharged slow-speed two-

stroke cycle diesel engine?

o (A) A mechanically driven auxiliary blower is usually provided because the turbocharger cannot provide enough air at low engine speeds and loads.

• (B) An electrically driven auxiliary blower is usually provided because the turbocharger cannot provide enough air at low engine speeds and loads.

o (C) An electrically driven auxiliary blower is usually provided because the turbocharger cannot provide enough air at high engine speeds and loads.

o (D) A mechanically driven auxiliary blower is usually provided because the turbocharger cannot provide enough air at high engine speeds and loads.


37. In a two-stage flash evaporator, the sea water feed temperature is increased as it passes through the __________.

o (A) second stage distilling condenser o (B) salt water feed heater o (C) first stage distilling condenser • (D) all of the above


38. The load is always placed on the lower half of the main bearings in a __________.

• (A) two-stroke cycle engine o (B) four-stroke cycle engine o (C) reverse cycle engine o (D) double acting engine


39. Which of the routine maintenance procedures listed is required for starting air receivers?

• (A) Frequent draining of accumulated moisture. o (B) Frequent testing of relief valves. o (C) A close watch on temperature to prevent fluctuations in pressure. o (D) Frequent cleaning to remove oil and foreign matter.


40. Rudder position is shown on the bridge by the __________.

• (A) rudder angle indicator o (B) follow-up gear o (C) telemotor position o (D) Rapson slide indicator



8/31/2017

U.S.C.G. Merchant Marine Exam QMED Q804 Oiler, Part I Illustrations: 16 41. The process of boiling sea water in order to separate it into fresh water vapor and brine is usually

defined as __________.

o (A) dehydration o (B) dissolution o (C) condensation • (D) evaporation


42. Corrosion inhibitors and/or soluble oils are added to diesel engine cooling systems to __________.

o (A) reduce the cooling water temperature o (B) increase cooling water hardness • (C) form a protective film on metal surfaces o (D) maintain low pH in the cooling water


43. The DC heater automatic level dump valve is used to __________.

• (A) drain excess feedwater to the distilled water tank o (B) divert the flow of condensate from the first stage heater to the vent condenser o (C) recirculate condensate to the atmospheric drain tank o (D) maintain a proper condensate level in the condenser hotwell


44. The cylinders and intercoolers of most low-pressure air compressor's are cooled by __________.

• (A) air o (B) CO2 o (C) oil o (D) water



8/31/2017

U.S.C.G. Merchant Marine Exam QMED Q804 Oiler, Part I Illustrations: 16 45. If a steam propulsion plant is provided with two main propulsion boilers, two fuel oil service heaters,

two fuel oil service pumps, and two fuel oil settling tanks, what is the capacity of each fuel oil service heater?

• (A) Each heater has the capacity to supply heated fuel to both boilers under full load with one service pump running.

o (B) Each heater has the capacity to supply heated fuel to both boilers under full load with both service pumps running.

o (C) Each heater has the capacity to supply heated fuel to just one boiler under full load with both service pumps running.

o (D) Each heater has the capacity to supply heated fuel to just one boiler under full load with one service pump running.


46. One of the consequences in continuing to operate a centrifugal bilge pump with the discharge valve closed, is that the __________.

o (A) motor overload will open o (B) motor will overheat o (C) relief valve will open • (D) pump will overheat


47. In a diesel engine exhaust system, the cooling of the exhaust gases below their dew point, will result in __________.

o (A) increased engine back pressure • (B) sulfuric acid corrosion o (C) surface pitting of the turbocharger compressor blades o (D) moisture impingement on the turbocharger compressor blading


48. The steam drum in a D-type marine boiler __________.

o (A) maintains circulation by forcing steam bubbles downward in the generating tubes o (B) acts as a receptacle for heavy suspended solids in boiler feedwater o (C) supports the superheater tube bank • (D) provides a space for moisture to separate from the steam



8/31/2017

U.S.C.G. Merchant Marine Exam QMED Q804 Oiler, Part I Illustrations: 16 49. When operating with the auxiliary feed line, feedwater flow is controlled __________.

o (A) automatically by the economizer bypass o (B) manually by adjustment of the auxiliary feedwater regulator spring setting • (C) manually by throttling the auxiliary feed stop-check valve o (D) automatically by the main feedwater regulator


50. Greases used for most marine applications would use what thickening base?

o (A) Calcium-based o (B) Lime-based o (C) Aluminum-based • (D) Lithium-based


51. When starting a turbo-generator in an automated plant, you must provide lube oil pressure to the unit by means of __________.

• (A) the hand-operated or auxiliary lube oil pump o (B) a line from the other generator o (C) a line from the gravity tank o (D) the main lube oil pump


52. If an air compressor is used to supply air primarily to the combustion control system and other pneumatic controllers, the entire system is known as the __________.

• (A) control air system o (B) ships service air system o (C) forced draft air system o (D) supply air system


53. What is the name of the device pictured in the illustration? Illustration SE-0001

• (A) Gear type flexible coupling o (B) Solid coupling o (C) Quill shaft o (D) Hydraulic clutch



8/31/2017

U.S.C.G. Merchant Marine Exam QMED Q804 Oiler, Part I Illustrations: 16 54. The device shown in the illustration is a __________. Illustration GS-0155

o (A) relief valve • (B) flushometer valve o (C) hydrokineter o (D) back pressure regulator


55. The primary reason low-pressure evaporators produce distillate more efficiently, and with less scale formation, than high-pressure evaporators is __________.

• (A) evaporation is accomplished in a vacuum o (B) evaporation in a submerged medium produces more distillate o (C) due to the higher temperature of the incoming feed o (D) due to the latent heat of evaporation principle


56. Which of the statements represents a characteristic of the thrust collar in a Kingsbury thrust bearing?

• (A) It turns with the shaft and the pivot shoes do not rotate. o (B) It is stationary and the shoes turn with the shaft. o (C) It is turned by the base ring of the bearing. o (D) It is held in position by the bearing base ring.


57. To prevent pulsations from developing in the boiler feedwater lines, the discharge side of a reciprocating feed pump is equipped with a/an __________.

o (A) feedwater regulator • (B) air chamber o (C) reed valve o (D) relief valve


58. On a main propulsion turbine set of a merchant ship, where is the astern staging generally located?

• (A) Within the low-pressure turbine o (B) Within the intermediate pressure turbine o (C) Within a separate astern turbine o (D) Within the high-pressure turbine



8/31/2017

U.S.C.G. Merchant Marine Exam QMED Q804 Oiler, Part I Illustrations: 16 59. As found in a reduction gear drive system, thrust bearings serve to __________.

o (A) hold the main engine in place o (B) increase the shaft speed o (C) limit the radial movement of the shaft • (D) transmit the force produced by the propeller to the structure of the ship


60. Most type(s) of microbiological growths in fuel are __________.

o (A) bacteria o (B) yeasts o (C) fungi • (D) all of the above


61. Which of the following precautions should be taken prior to lighting off a boiler?

• (A) Purge the furnace of combustible gases. o (B) Bottom blow the mud drum. o (C) Close the air register. o (D) Secure the main steam line drains.


62. The illustrated device is operated directly by __________. Illustration MO-0041

o (A) a rocker arm and push rod • (B) fuel oil pressure o (C) cam action o (D) excessively high combustion pressure


63. An increase in the air inlet manifold pressure of a diesel engine will result in a/an __________.

o (A) decrease in maximum cylinder pressure o (B) increase in ignition lag • (C) decrease in fuel consumption per horsepower-hour o (D) decrease in exhaust manifold pressure



8/31/2017

U.S.C.G. Merchant Marine Exam QMED Q804 Oiler, Part I Illustrations: 16 64. The amount of fuel delivered by a helical plunger fuel injection pump is controlled by __________.

o (A) varying the pump discharge pressure o (B) varying the pump return pressure • (C) rotation of the pump plunger o (D) rotation of the pump barrel


65. A bearing using an oiling ring as a means of static oil feed must occasionally be serviced by removing the wear particles, grit, and moisture. How is this accomplished?

o (A) Changing the filter element. o (B) Rotating the handle of the lube oil strainer. o (C) Draining the bottom of the strainer housing. • (D) Draining the bottom of the bearing lube oil sump.


66. In the illustrated schematic, the device used to replace the six-way valve, as found on many older type steering gears, is the component labeled as __________. Illustration GS-0123

• (A) "A" o (B) "B" o (C) "F" o (D) "H"


67. An efficient seal is normally obtained between the upper and lower halves of a turbine casing by __________.

o (A) asbestos gaskets o (B) flexible steel seal strips • (C) precision metal-to-metal contact o (D) copper gaskets


68. Air motors used for starting some auxiliary diesel engines are generally the type known as __________.

• (A) vane motors o (B) accumulator motors o (C) plunger motors o (D) gear motors



8/31/2017

U.S.C.G. Merchant Marine Exam QMED Q804 Oiler, Part I Illustrations: 16 69. What statement is true concerning a propulsion steam turbine turning (jacking) gear?

o (A) The jacking gear splined clutch is associated with the low-pressure turbine second reduction pinion.

o (B) The jacking gear splined clutch is associated with the low-pressure turbine first reduction pinion.

• (C) The jacking gear splined clutch is associated with the high-pressure turbine first reduction pinion.

o (D) The jacking gear splined clutch is associated with the high-pressure turbine second reduction pinion.


70. Hydraulic couplings will transmit torque equal to the input torque by means of energy changes in a rotating vortex of liquid. For the vortices to form, there must be __________.

• (A) slip between the impeller and runner o (B) less than 2 percent slip between the impeller and runner o (C) axial thrust generated by the runner pinion shaft o (D) momentary torsional vibration transmitted by the driving impeller



8/31/2017


10/15/2015

GS-0029

Adapted for testing purposes only from KIAMEH, Power Plant

Equipment Operation and Maintenance Guide

Copyright © 2012 by the McGraw Hill Companies, Inc.

Further reproduction prohibited without permission



1/11/2016

GS-0042

Adapted for testing purposes only from SEWARD, Marine Engineering

Copyright © 1968 by The Society of Naval Architects and Marine Engineers

Further reproduction prohibited without permission of 33 Q804 Oiler, Part I


11/9/2015

GS-0123

Adapted for testing purposes only from STUTMAN, Applied Marine Hydraulics

Copyright © 1988 by Cornell Maritime Press, Inc.



6/8/2016

GS-0155

Adapted for testing purposes only from Utilitiesman Basic, Volume 1

NAVEDTRA 14265



MO-0041

Adapted for testing purposes only from Souchotte and Smith, Marine Auxiliary

Machinery. Copyright © 1975 by Butterworth & Co (Publishers) Ltd.

Further reproduction prohibited without permission.

1

2

3

4

5

6

7

8

9 10

11



4/21/2015

MO-0058

Adapted for testing purposes only from HARRINGTON, Marine Engineering. Copyright

© 1992 by The Society of Naval Architects and Marine Engineers. Further reproduction

prohibited without permission. of 33 Q804 Oiler, Part I


8/4/2015

MO-0064

Adapted for testing purposes only from SHIELDS, Boilers, Types, Characteristics, and

Functions

Copyright © 1961 by McGraw-Hill, Inc.

Further reproduction prohibited without permission.



5/17/2017

MO-0077

Adapted for testing purposes only from HARRINGTON, Marine Engineering




12/23/2016

SE-0012

Adapted for testing purposes only from Machinist’s Mate 3 & 2

NAVEDTRA 14151




11/7/2016

SG-0008

Adapted for testing purposes only from Principles of Naval Engineering

NAVPERS 10788-B




11/8/2016

SG-0009

Adapted for testing purposes only HARRINGTON, Marine Engineering





11/9/2016

SG-0010






12/6/2016

SG-0025

Adapted for testing purposes only from SEWARD, Marine Engineering, Volume II




u.s.c.g. merchant marine exam qmed q804 oiler, …. merchant marine exam . qmed . q804 oiler, part i...

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