Review Now

PREVIOUS
NEXT

1. Before electrical work can be safely undertaken, the equipment must be de-energized,locked and tagged out, and verification must be made that the circuit is actually dead. What testing device is most certain to reliably verify that a circuit is actually dead?

 
 
 
 

2. With all other factors considered equal (such as voltage, conducting path through the body and the duration of contact), contact with an energized electrical system conductor of which system type would produce the most damaging effect?

 
 
 
 

3. At a minimum threshold, how many milliamps of current through the body produces a condition where most people would suffer ventricular fibrillation and could only be resuscitated with a ventricular defibrillator?

 
 
 
 

4. At a minimum threshold, how many milliamps of current through the body produces a condition where most people would experience respiratory paralysis and be unable to breathe while still in contact with the energized conductor?

 
 
 
 

5. At a minimum threshold, how many milliamps of current through the body produces a condition where most people would be unable to let go of the energized electrical conductor due to involuntary muscular contraction?

 
 
 
 

6. Which of the following voltage testers would be associated with high quality, be safe to use, and minimize the electric shock hazard?

 
 
 
 

7. After prior isolation and lockout/tagout procedures are performed, which electrical device requires discharging any stored electrical energy before any work may safely begin?

 
 
 
 

8. At a minimum threshold, how many milliamps of current through the body produces a painful sensation that most people would perceive as an electric shock?

 
 
 
 

9. When you are making a high potential test (megger) on the motor coils of repaired electrical machinery to ground. What would a low resistance reading indicate?

 
 
 
 

10. Which of the listed conditions will occur if dirt and grease are allowed to accumulate between the commutator segments of a DC motor?

 
 
 
 

11. In general, what can cause D.C. propulsion motor brush sparking to be excessive?

 
 
 
 

12. What statement is true concerning the charging a 100 amp-hour lead-acid battery?

 
 
 
 

13. What should be used in the cleaning of a D.C. propulsion motor's commutator face?

 
 
 
 

14. How is the seating the brushes on a DC motor commutator first accomplished?

 
 
 
 

15. D.C. propulsion motor brush pressure depends on the brush grade used. In practice with what device is the proper brush pressure established?

 
 
 
 

16. With regard to the maintenance of electrical generating machines with insulated pedestal bearings, what practice should be avoided?

 
 
 
 

17. Rotor-to-stator air gap readings should be periodically taken for electrical generation equipment. What is the best tool to use to take these measurements?

 
 
 
 

18. If rotor-to-stator air gap readings for an electrical generating machine have changed significantly from the last reading, what should be checked?

 
 
 
 

19. How may chattering of the collector/slip ring brushes on a generator be remedied?

 
 
 
 

20. In performing routine maintenance of a ship's service alternator, what should be included?

 
 
 
 

21. Which of the following materials is recommended for burnishing the slip rings of an alternator after grinding or turning?

 
 
 
 

22. Which of the following statements, concerning the cleaning maintenance of a brushless generator, is correct?

 
 
 
 

23. When an alternator is to remain idle for even a few days, what should be done?

 
 
 
 

24. While inspecting the copper commutator bars of a DC generator, you notice a chocolate brown film covering the bars. What should be done?

 
 
 
 

25. As the brushes ride on the commutator of a DC generator, eventually mica ridges will form between the bars causing sparking and chipping of the brushes. When this happens the mica must be undercut. To what depth is the mica undercut?

 
 
 
 

26. Incorrect brush pressure can result in accelerated brush wear on a DC generator. What statement concerning brush pressure is true?

 
 
 
 

27. If a DC generator was disassembled during overhaul, it is important that the brush holder rigging be installed in the neutral plane. On larger machines, if the brush rigging and end bells are not match-marked, what is the correct procedure for determining the neutral setting using factory marks?

 
 
 
 

28. With the marked armature slots positioned directly between the interpoles and the main field poles, the brushing rigging should be adjusted and clamped so that the brushes are positioned directly over the marked armature bars.

 
 
 
 

29. Before working on an electric cargo winch master switch or controller, what should be done?

 
 
 
 

30. Which of the following methods should be used to dress the face of silver-plated contacts?

 
 
 
 

31. The current at which a magnetic-type overload relay tends to trip may be decreased by raising the plunger further into the magnetic circuit of the relay. What effect does this action have?

 
 
 
 

32. High pressure compressed air should not be used to clean electric motors or controller equipment. Why not?

 
 
 
 

33. What device can be used to check the calibration of a circuit breaker?

 
 
 
 

34. Which of the listed pairs of materials make the best insulators?

 
 
 
 

35. When a fluorescent lamp has reached the end of its useful life, it should be replaced immediately. If not, what condition could the resultant flashing cause?

 
 
 
 

36. As part of a routine maintenance program for deck machinery motor controllers, what should be done?

 
 
 
 

37. If deck machinery is expected to be idle for an extended period of time, what should be done?

 
 
 
 

38. If a spring-set electric solenoid-released brake on a winch fails to hold a load properly when the solenoid is de-energized, what must be done?

 
 
 
 

39. If it becomes absolutely necessary to run an alternator at lower than 5% below its rated frequency, in terms of output voltage, what must be done?

 
 
 
 

40. Upon loss of field excitation of a generator operating in parallel with others, what must be done?

 
 
 
 

41. Under unusual circumstances, it may be required to operate a ship's service generator above its rated kVA. What supplemental casualty control action will be required?

 
 
 
 

42. When a self-excited alternator's field has lost its residual magnetism due to a prolonged idle period, it will fail to produce a voltage. Flashing the field is the procedure used to restore the residual magnetism. Using a 12 volt storage battery, how is this performed?

 
 
 
 

43. You are in the planning stages of replacing a battery charger, where an exact duplicate of the charger to be replaced is not available. Obviously the charger must be suitable for the battery to be charged. According to 46 CFR, Subchapter J (Electrical Engineering), which of the following is a true statement concerning battery chargers?

 
 
 
 

44. According to 46 CFR, Subchapter J (Electrical Engineering), which of the following statements concerning battery installations is correct?

 
 
 
 

45. Suppose a cargo vessel of 1600 gross tons or more is fitted with emergency storage batteries for the purpose of supplying emergency lighting and power. According to 46 CFR Subchapter J (Electrical Engineering), the capacity of the storage batteries is such that they should be able to successfully power the emergency loads for a period of 18 hours. Beginning with fully charged batteries, what is the minimum allowable voltage of the batteries after the 18 hour discharge period assuming a nominal voltage rating of 24 VDC and operating at rated capacity.

 
 
 
 

46. Suppose a cargo vessel of 1600 gross tons or more is fitted with emergency storage batteries for the purpose of supplying emergency lighting and power. According to 46 CFR, Subchapter J (Electrical Engineering), the capacity of the storage batteries is such that they should be able to successfully power the emergency loads for a period of 18 hours. Beginning with fully charged batteries, what is the minimum allowable percentage of the voltage rating of the batteries after the 18 hour discharge period assuming a nominal voltage rating of 24 VDC and operating at rated capacity

 
 
 
 

47. In accordance with 46 CFR Part 112, a storage battery for an emergency lighting and power system must have the capacity to accomplish which of the following?

 
 
 
 

48. In accordance with 46 CFR, Subchapter J (Electrical Engineering), each diesel engine driven generator prime mover must have an over speed device, independent of the normal operating governor. If in testing the over speed device, what should be the trip point setting in terms of rated speed?

 
 
 
 

49. You are in the planning stages of setting the instantaneous trip of a ship's service generator circuit breaker. According to 46 CFR, Subchapter J (Electrical Engineering), what statement is true regarding the criteria for the instantaneous trip set point, assuming the generator is capable of being paralleled?

 
 
 
 

50. There are very specific rules that govern the testing of generators found in the appropriate publication incorporated by reference. According to 46 CFR, Subchapter J (Electrical Engineering), which agency publishes the rules for the construction and testing of generators.

 
 
 
 

51. You are in the planning stages of setting the longtime over current trip of a ship's service generator circuit breaker. According to 46 CFR, Subchapter J (Electrical Engineering), what statement is true regarding the criteria for the longtime over current trip set point, assuming the generator is capable of being paralleled?

 
 
 
 

52. Assuming that a ship's service generator is directly coupled to the prime mover, what condition must cause a prime mover to automatically shut down?

 
 
 
 

53. Emergency generators are required to automatically start upon a loss of normal supply voltage, according to 46 CFR, Subchapter J (Electrical Engineering). In conducting a test of the emergency generator automatic transfer of load function, if the normal system supply voltage is 450 VAC, to what value would the emergency generator output voltage have to rise to trigger the automatic transfer of emergency loads to the emergency generator?

 
 
 
 

54. Emergency generators are required to automatically start upon a loss of normal supply voltage, according to 46 CFR, Subchapter J (Electrical Engineering). In conducting a test of the emergency generator automatic transfer of load function, if the normal system supply voltage is 480 VAC, to what value would the normal source output voltage have to rise to trigger the automatic transfer of emergency loads back to the normal power source?

 
 
 
 

55. It would have to rise to 408 VAC. According to 46 CFR, Subchapter J (Electrical Engineering), which of the following starting aids is the ONLY method allowed to ease the starting of emergency diesel generator engines?

 
 
 
 

56. According to 46 CFR, Subchapter J (Electrical Engineering), in response to a loss of normal power or a simulated test, when will the emergency loads automatically be transferred to the emergency diesel generator?

 
 
 
 

57. According to 46 CFR, Subchapter J (Electrical Engineering), emergency diesel engine starting systems are required to have sufficient capacity to provide power for at least how many consecutive starts?

 
 
 
 

58. According to 46 CFR, Subchapter J (Electrical engineering), regulations prohibit the use of portable electric cord or fixture wire aboard ship if that wire or cord is smaller than what size?

 
 
 
 

59. According to 46 CFR, Subchapter J (Electrical Engineering), what statement is true concerning the use of twist-on connectors?

 
 
 
 

60. According to CFR, Subchapter J (Electrical Engineering), which of the following statements is true concerning flexible electric cord and cable used aboard ship?

 
 
 
 

61. According to 46 CFR, Subchapter J (Electrical Engineering), when considering replacement, instrument and control wiring in a switchboard is to be of what minimum size?

 
 
 
 

62. Electrical wire in general, when used aboard vessels must meet minimum requirements. Which of the following statements is/are correct?

 
 
 
 

63. You are in the planning stages of making up a portable cable to be used for transmitting power from a battery charger on a ship to a charging receptacle on a lifeboat. According to 46 CFR, Subchapter J (Electrical Engineering), which of the following statements is true regarding the transmitting of power between receptacles?

 
 
 
 

64. According to 46 CFR, Subchapter J (Electrical Engineering) regulations, receptacle outlets at or above what voltage are required to have grounding poles?

 
 
 
 

65. According to 46 CFR, Subchapter J (Electrical Engineering) regulations, what is the minimum conductor size associated with a 25 or 30 ampere lighting branch circuit supplying a nonswitched cargo hold light fixture?

 
 
 
 

66. What is the primary means by which an electrical maintenance worker is protected from electrical hazards while performing work on an electrical circuit?

 
 
 
 

67. Which of the following devices would be forbidden to use as a primary means of electrical isolation?

 
 
 
 

click here to take the assessment test