Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR

USCG Marine Electrical Systems (Set 43)

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Question 1 of 30

What is a common type of protective covering used on electrical conductors?

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30 MCQs

#1 What is a common type of protective covering used on electrical conductors? #2 Which of the listed types of lighting fixtures does the diagram shown in figure "A" of the illustration represent? EL-0081 #3 What type of circuit is represented by the diagram shown in the illustration? EL-0058 #4 As shown in the illustration, the change-over switch is what type of device? EL-0058 #5 As shown in the illustration, what event would give the same indication that would occur when a stern light circuit fuse blows open? EL-0058 #6 What is the purpose of the capacitor within component "5" of the circuit shown in figure "B" of the illustration? EL-0081 #7 A shown in the illustration, which of the lighting fixtures represents an incandescent bulb? EL-0122 #8 What are the operating characteristics of a step-down potential transformer in terms of the secondary load? #9 Which of the listed transformers uses a single winding to produce voltage transformation? #10 What is the function of the autotransformers used with autotransformer starters used on some large AC motors? #11 How are power transformers rated? #12 Why are transformer cores laminated? #13 What is the purpose of the device labeled 'Man-Auto Sw.' in the illustrated switchboard? EL-0003 #14 Which of the listed sections of an emergency switchboard is used to supply power for alarm signals under emergency conditions? #15 The timer element of a reverse power relay cannot be energized unless what condition is met? #16 When electrical cables penetrate watertight bulkheads, what must be provided for? #17 What is the reason that some electric cables are formed of stranded wire? #18 Which of the following characteristics is most critical in determining the wire gauge size of the cable to be used in a particular circuit? #19 As shown in the illustration, which of the following pieces of equipment is fed with the three conductor cable with the individual conductors having the smallest cross-sectional area? EL-0165 #20 How are the line losses in a distribution circuit kept to a minimum? #21 Why is it necessary to perform periodic testing of correctly rated and properly installed circuit breakers? #22 What should be done when performing maintenance of circuit breaker contacts? #23 Which of the listed classes of electrical insulation is suited for the highest operating temperature? #24 Which of the following procedures should be used to maintain a large electric motor during periods of inactivity? #25 To check the three line fuses protecting a three-phase motor using a multimeter set up as a voltmeter, what should be done FIRST? #26 As a general rule, what is the first troubleshooting action to be taken in checking inoperative electric circuits? #27 In order to definitively determine whether or not fuse "1", shown in the illustration is blown using an on-line testing technique, across what points would you connect the voltmeter leads? Illustration EL-0062 #28 To test fuses in an energized circuit, what testing apparatus or meter should be used? #29 In addition to short circuits and sustained overloads, in what other situation are fuses likely to blow? #30 When replacing a fuse with one of a ampere higher rating than the original, which of the following is true?

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