guide questionnaires for seafarers · 74. a split-phase induction squirrel-cage motor will not come...

MANAGEMENT – ENGINE

REPUBLIC OF THE PHILIPPINES

DEPARTMENT OF TRANSPORTATION

MARITIME INDUSTRY AUTHORITY STCW OFFICE

GUIDE QUESTIONNAIRES

for seafarers

The Annual Publication of Database of Questionnaires is mandated in Republic Act 10635 or the Act Establishing the Maritime Industry Authority (MARINA) as the Single Maritime Administration Responsible for the Implementation and Enforcement of the 1978 International Convention on Standards of Training, Certification and Watchkeeping for Seafarers, 1978, as amended and International Agreements or Covenants related thereto and its Implementing Rules and Regulations. These sample questions have been reviewed and validated by our respective Board of Examiners which may serve as a guide for the review of aspiring Marine Deck and Engineering Officers, towards the successful completion of the Theoretical Examination. The following sample questions do not reflect the actual set of database of questions given during the theoretical examination. Examinees are encouraged to study the contained sample questions and probable answers as they are intended to give an indication of the format and difficulty level of the theoretical examination. You may access these guide questionnaires with your smart gadgets anywhere and anytime at your convenience. Please consider the environment before printing. Thank you.

A Publication of the MARINA STCW Office


FUNCTION 2 – Competence 6 1. The pitting of controller contacts can be caused by ____________. 2. Which of the following components are used to convert alternating

current produced in the generator windings to direct current? 3. If a multiple grounds have developed and were initially indicated by the

ground-detecting system as one ground, the FIRST step in locating the grounds is to __________.

4. Before working on an electric cargo winch on master switch or controller,

you should __________. 5. The good characteristics of an auto transformer as compared to other

types of transformer are ______________. I. Efficiency is extremely high II. Short circuit current is high III. Physical size is very small

6. The insulation materials being used on any type of transformers

are_______. I - Mica II - Varnish III - Fiber 7. While standing an "at sea watch" onboard a DC diesel-electric drive ship

you notice sparking of the brushes on the DC drive motor. You should first_____.

8. An alternator will fail to produce line voltage as a result of __________. 9. An AC diesel generator incapable of being paralleled with the main bus

normally employs an isochronous governor in order to __________. 10. A self-excited DC generator fails to come up to its normal 440 volts. The

cause may be___________. 11. Which equipment should be checked visually for cleanliness and all

contacts checked for burning, overheating, wear, erosion and misalignment?

12. Which of the following statements concerning the maintenance of solid-

silver contacts in, relay and auxiliary control circuits is correct?


13. A capacitor discolored due to excessive heat should be_____. 14. In an impressed current cathodic protection system, the anode is_____. 15. Air gap readings should be taken periodically on electrical generation

equipment to_____. 16. Impressed current cathodic protection is used on vessels instead

of_____. 17. To avoid damaging the components of a printed circuit board when

testing it with a DC volt-ohmmeter, you should_____. 18. Air gap readings should be taken on electrical generation periodically to

___. I. check machine efficiency II. determine the need for cleaning

19. Air gap readings for electrical generating equipment should be taken

periodically to ___. I. determine the condition of the bearings II. prevent damage to the rotor and stator

20. If air gap readings for an electrical generating machine have changed

significantly from the last reading, you should check ___. 21. If an alternator is to be inactive for a considerable period of time, which

of the following action should be taken? 22. Upon failure of the ship‟s normal electrical power supply, the emergency

generator should automatically start and supply power to the emergency switchboard through the_____.

23. Which type of flux should be used when soldering electrical wire

connections for electronic components on printed circuit boards? 24. The use of a high wattage soldering iron when soldering or desoldering

components on a printed circuit board may cause which of the following faults to occur?

25. The removal of paint from electrical equipment such as generators,

should be cautiously undertaken because ____.


26. With regards to the maintenance of electrical generating machines with pedestal insulated bearings it is important to never ____.

27. Which of the following procedures should be used to maintain a large

electric motor during periods of inactivity? 28. Automatic shutdown of an emergency diesel generator is required if

the_____. 29. For emergency power and lighting systems, which of the listed items is

the only permissible starting aid for the emergency diesel generator engine?

30. Electrical leads and insulation on a motor should be painted with_____. 31. A device which can be used to check the calibration of a circuit breaker

is a ___. 32. Excessive heat in an operating motor controller can result from ___. 33. Which of the listed conditions will occur if dirt and grease are allowed to

accumulate between the commutator segments of a motor? 34. A split-phase induction squirrel-cage motor will not come up to speed,

even though the rated voltage, rated frequency, and rated load are supplied. The suspected trouble could be due to _____.

35. Which of the listed conditions might contribute to very rapid wearing of a

DC machine's commutator bars? 36. If a single-phase induction fails to start, the problem may be ____. 37. Voltage failure of an AC generator may be caused by ____. 38. A loss of field excitation to an AC generator while operating in parallel

will cause it to ____. 39. When correcting specific gravity readings of a lead-acid battery for

existing temperature conditions, you should ____. 40. During maintenance of circuit breakers, ____. 41. What is the cause of sparking of DC motor brushes?


42. When a megohmmeter is used to test the winding insulation of a large

motor, an initial dip of the pointer toward zero is caused by ____. 43. Before testing insulation with a megohmmeter, the windings of large

machines should be grounded for about 15 minutes prior to the test, because the _______.

44. Regarding battery charging rooms, ventilation should be provided

__________. 45. The brushes in a generator must be positioned in the neutral plane to

avoid sparking. Where is its proper position? 46. The air gap in an induction motor should be periodically checked with

feeler gage, to prevent possible ____. 47. To perform an insulation resistance test of an individual electric motor

coil, the megohmmter should be connected to ____. 48. AC and DC generators are similar because they ____.

49. Periodic testing of circuit breakers is necessary to assure that a correct

rated and properly installed unit ___. 50. The first normal step in troubleshooting a transistor circuit card is

to_______. 51. A generator has been exposed to water and is being checked for its safe

operation. Therefore, it is necessary to_______. 52. To determine the state of charge of a wet cell nickel-cadmium battery,

you should ____. 53. When troubleshooting an alkaline storage battery, a weak or dead cell is

best located by ____. 54. If a transformer is connected to a DC source, the transformer will

overload at the _______. 55. As an armature revolves within a magnetic field, friction is developed

between the rotated magnetized particles as they pass through each magnetization cycle. This results in _______.


56. While troubleshooting a circuit in an engine room central control console, a resistor is suspected of being faulty. Which of the following precautions must be observed if an ohmmeter is to be used to check its value?

57. In troubleshooting a circuit, you suspect that a resistor may be faulty.

Which of the precautions listed must be observed when using an ohmmeter to carry out this test?

58. Which of the listed procedures should be carried out to prevent moisture

damage to electrical apparatus during extended periods of idleness? 59. A hydrometer indicates specific gravity by comparing the ____. 60. Which of the following precautions should you take when securing

propulsion generators and motors for an extended period of time? 61. Cleaning of electrical insulation should be ________. 62. As a general rule, the first troubleshooting action to be taken in checking

faulty electric control devices is to________. 63. What might be the cause of abnormal temperature rise in an electric

motor ball bearings? 64. Magnetic controller contacts may become welded together during

operation because of ________ . 65. If a magnetic controller relay fails to drop out when the coil voltage is

removed from the relay, the probable cause may be____ .

66. When a megohmmeter is used to test insulation, what is the cause of

gradual rise of the pointer reading as a result of continued cranking? 67. One method of troubleshooting digital circuits in a console is to

_______. 68. A generator has been exposed to water and is being checked for its safe

operation. Therefore, it is necessary to _____. 69. While standing watch underway at sea in the engine room, there is a

complete loss of electrical power. When power is restored, the steering gear pimp motor will ___.


70. Electrical machinery insulation will break down more rapidly due to

_______. 71. When troubleshooting a magnetic controller, it is found that the contacts

are welded together, the most probable cause is _____. 72. A fuse that blows often should be replaced only with a fuse of _____.

. 73. To determine the state of charge of a nickel-cadmium battery, you would

use a/an _____. 74. A split-phase induction squirrel-cage motor will not come up to speed,

even though the rated voltage, rated frequency, and rated load are supplied. The suspected trouble could be due to _____. I. a faulty centrifugal switch II. broken rotor bars III. worn bearings

75. When paralleling two alternators, the synchronizing lamps remain lit as

the synchroscope pointer approaches the 0º position. This indicates the _____.

76. Decreasing the frequency in a capacitive circuit while maintaining a

constant circuit voltage will result in a/an______. 77. The state of charge of a lead-acid battery is best indicated by the ____. 78. Routine AC motor maintenance should include periodic ____. 79. Which of the following problems is indicated if lead-acid battery begins to

gas violently when it is first placed on charge? 80. Before testing insulation with a megohmmeter, the windings of large

machines should be grounded for about 15 minutes just prior to the test as the______.

81. Moisture absorbed in the winding or condensed on the surface of

electrical machinery insulation____ 82. The specific gravity of the electrolyte solution in a lead acid battery ____.


83. On large generators, space heaters are used to ___. 84. What might be the cause if the electric motor on an electric driven

compressor fails to start? 85. Which of the listed conditions could indicate the need for cleaning

electrical insulation? 86. If a magnetic controller contactor fails to pick up when the operating coil

is energized, one possible cause may be ____. 87. A current carrying_ conductor making an electrical contact with a wiring

metal conduit is indicated by a_______. 88. To test fuses in an energized circuit, you should use a ______. 89. The type of feature afforded auxiliaries vital to the operation of propelling

equipment, where automatic restart after a voltage failure would not create a hazard, is termed _____.

90. When replacing a power transistor fitted with a heat sink in a circuit, a

coating of silicone grease is applied between the transistor case and the heat sink. This is done to ______.

91. The frequency of an AC generator is adjusted by means of the _______. 92. The charge of a lead-acid battery is checked with a/an ________. 93. Routine maintenance of dry-type transformers should include ____. 94. Electric strip heaters are used in motor controllers to ____________. 95. If a three-phase induction motor malfunctions and drops to a single-

phase (one supply line open). 96. Relative to the secondary winding of a step-up transformer, the primary

winding will have_______________. 97. An open occurring within the field rheostat of an AC generator can be

detected by short circuiting its terminals and observing a_______.


98. Which of the following precautions should be taken when troubleshooting carious power circuits using an electronic solenoid type voltage tester?

99. Which of the following precautions should be taken when

troubleshooting various power circuits using an electronic voltage tester? 100. Which of the following precautions should be taken when

troubleshooting various power circuits using VOM multimeter? 101. An open shunt field in a direct current machine may be located by

connecting the field circuit to an external power source, equal to the rated field voltage or less, and tested with a voltmeter from _____________.

102. When an alternator is to remain idle for even a few days, ______. 103. Motor starter or controller contacts may become welded together if the

contacts ____. 104. Motor controller or started contacts may become pitted and welded

together if the contacts ___. 105. During its operation, loud buzzing and resultant welding of contacts of a

magnetic relay may be caused by ____. 106. A three-phase, induction motor experiences an open in one phase.

Which of the listed automatic protective devices will prevent the machine form being damaged?

107. The function of no fuse breaker is to isolate the defective circuit from the

system so as to protect it from_______________. 108. Protection against sustained overloads occurring in molded-case circuit

breakers is provided by a/an _____. 109. Which of the following statements, concerning the general maintenance

of a brushless generator, is correct? 110. The main purpose of an electric space heater installed in a large

AC generator is to ___________.


111. The standard method of controlling the output voltage of a 440 volt, 60 Hz, AC generator is accomplished by adjusting the ______.

112. What is the use of commutators and brushes in DC generators? 113. The governor control switch of an alternator is moved to the

"raise" position. This action will______. 114. When troubleshooting an electronic circuit, a cold solder joint can be

located with the aid of an ohmmeter. Once the problem has been located, you should _____.

115. To repair a small electrical motor that has been submerged in saltwater,

you should _______. 116. It is a single-phase induction motor having a relatively high starting

torque. 117. Two paralleled alternators are operating near rated load. If one trips out

mechanically, which of the listed actions should be taken FIRST? 118. When troubleshooting electronic equipment, the FIRST step to be taken

before testing the circuit voltage is to______. 119. Moisture accumulating in electric motors and generator windings having

a cold insulation resistance greater than 50,000 ohms may be baked out with internal heat. This heat can be developed by ___.

120. Which of the listed precautions should be observed before spraying

liquid solvent on the insulation of an electric motor? 121. A single-phase induction motor starts, comes up to about 75% rated

speed slows down to a lower speed, and accelerates again. The problem is most likely in the ___.

122. When troubleshooting console circuit card suspected of being faulty;

first, check for proper voltages to the card and then_______. .

123. Which of the following methods should be used to test for an 'open' coil

in an AC motor stator?


124. The state of charge of a lead-acid storage battery is best indicated by the ___.

125. A result of an overloaded circuit __________. 126. An alternator switchboard has a synchroscope and synchronizing lamps.

If the synchroscope is broken, which of the steps listed is the most essential before an alternator can be paralleled with the bus?

127. “Low Voltage Release” (LVR protection used in some shipboard motor

starters and other control equipment will have which of the following characteristics?

128. The electrical energy necessary to transmit a person's voice over a

sound-powered telephone circuit is obtained from______. 129. Which of the following actions must be carried out before a voltage tester

can be used to test the three line fuses to a three- phase motor? 130. When testing a capacitor with an analog type ohmmeter, a good

capacitor will be indicated when ______. 131. Which of the following problems will most likely occur if the starting

winding of a split-phase induction motor failed to cutout once the motor was in continuous operation?

132. Which of the following statements is true concerning the operation of

modern marine electric drive DC propulsion motors? 133. Which of the methods listed is used to maintain the division of load

between two compound-wound, DC generators operating in parallel? 134. Why should high pressure compressed air not be used to clean electric

motors or controller equipment? 135. Under which of the following conditions will a lead-acid battery be given

a „test discharge? 136. What is the purpose of thermal strip heaters provided in DC main

propulsion motors? 137. A low-voltage protection circuit is used in electric motor starting

equipment to _____.


138. As a result of a serious mechanical malfunction in one of the ship‟s

service generators operating in parallel, you must secure that generator. In order to prevent a possible overload to the remaining generator, which of the following sequential courses of action should be taken?

139. A Silicon diodes designed for a specific reverse breakdown voltage,

become useful as an electronic power supply voltage regulator. 140. Which of the following represents the accepted method of cleaning dust

and foreign particles from electrical equipment while limiting damage to electric components?

141. A short in the shunt field of a DC motor is best located by_______. 142. Which of the following meters uses a shunt connected in series with the

load, but parallel with the meter movement? 143. One diode of a full-wave rectifier burned out in a shorted condition.

Therefore, the output will be______.

guide questionnaires for seafarers · 74. a split-phase induction squirrel-cage motor will not come...

Documents