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

USCG Marine Electrical Systems (Set 13)

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Question 1 of 30

When a low input voltage is delivered to a transformer which then produces a high output voltage, what is the proper name for the transformer type?

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30 MCQs

#1 When a low input voltage is delivered to a transformer which then produces a high output voltage, what is the proper name for the transformer type? #2 Which of the following statements is true concerning step-down transformer operation? #3 What will happen to the primary winding when the load increases on the secondary windings of a transformer? #4 When a transformer is used to step down voltage, what statement is true? #5 Which of the following statements describes the difference between the primary windings and the secondary windings of a 2:1 step-down voltage transformer? #6 What is the primary purpose associated with the use of transformers onboard ships with AC generators? #7 Which of the listed figures shown in the illustration represents a three phase transformer connected in a wye-delta configuration? Illustration EL-0084 #8 What is the basic operating principle of a transformer in terms of producing a voltage? #9 When working on a high voltage circuit, you should always have another person present with you. This person should have a good working knowledge of the hazards associated with working on high voltage electrical circuits as well as the first aid techniques for treating electrical shock. What other knowledge is essential? #10 What is the proper way to apply plastic electrical tape to an electric cable splice? #11 When working on electrical circuits containing large capacitors, in addition to de- energizing the circuit, which of the listed precautions should also be taken? #12 Which of the following statements represents the FIRST precaution to be taken prior to working on any installed electrical component? #13 When changing fuses, what safety precaution should be taken? #14 When replacing fuses, what practice should be observed? #15 What device can be used to check the calibration of a circuit breaker? #16 What should be done when performing maintenance of circuit breaker contacts? #17 As shown in the illustration, what maintenance would be required of the circuit components? Illustration EL-0058 #18 In order to safely carry out repairs to a generator circuit breaker, it must be isolated from the bus. How is this accomplished? #19 What should be included in the performance of routine maintenance of dry-type transformers? #20 When replacing a defective transformer in a paralleled transformer configuration, which of the following actions must be carried out to insure proper operation of the equipment it serves? #21 When maintenance personnel are working on electrical equipment, all supply switches should be secured in the open position and tagged. Who specifically should perform the lock-out/tag-out procedure? #22 Why must accidental grounds in a shipboard electrical system must be repaired as soon as possible? #23 The FIRST requirement for logical troubleshooting of any system requires the troubleshooter to do what? #24 Multiple grounds have developed and were initially indicated by the ground- detecting system as one ground. What is the FIRST step in locating the grounds? #25 When replacing a fuse with one of a ampere higher rating than the original, which of the following is true? #26 In order to definitively determine whether or not fuse "2", shown in the illustration is blown using an on-line testing technique, across what points would you connect the voltmeter leads? Illustration EL-0062 #27 If a digital multimeter is set up as shown in figure "A" of the illustration, what would be displayed on the screen if the fuse being tested is not blown and has proper continuity? Illustration EL-0210 #28 When testing for blown fuses in a three-phase supply circuit to a motor, what would be an acceptable method? #29 To test fuses in an energized circuit, what testing apparatus or meter should be used? #30 What would cause a fuse to blow?

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