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

USCG Marine Electrical Systems (Set 29)

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Question 1 of 30

If the primary winding of a voltage transformer is connected to a steady DC source, self-inductance and mutual inductance is not possible. As a result, what part of the transformer will result in current overload?

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30 MCQs

#1 If the primary winding of a voltage transformer is connected to a steady DC source, self-inductance and mutual inductance is not possible. As a result, what part of the transformer will result in current overload? #2 Which of the listed figures shown in the illustration represents a three phase transformer connected in a wye-wye configuration? EL-0084 #3 What is the purpose of a potential transformer in an electric circuit? #4 Which of the following statements is true concerning step-down transformer operation? #5 When a transformer is used to step down voltage, what statement is true? #6 What is the primary purpose associated with the use of transformers onboard ships with AC generators? #7 An autotransformer is equipped with a 50% tap, a 65% tap, and an 80% tap. Which of the following statements is true concerning a load connected to the 50% tap? #8 The transformer diagram shown in figure "B" of the illustration represents what type of transformer? EL-0082 #9 If the illustrated device in figure "B" has a step-up ratio of 10 to 1 what voltage would be measured at the secondary shortly after the primary of the device is connected to 110 volts DC and the primary current stabilized with a current of 12 amps? EL-0055 #10 Besides the fluorescent lamp itself and possibly a starter, which of the following components is included in a fluorescent lighting fixture? #11 What is the purpose of the inner phosphor coating of the fluorescent tube as shown in figure "A" of the illustration? EL-0081 #12 Incandescent lamps are classified according to the shape of the bulb and the type of service, as well as the size and style of the base. How are incandescent lamps rated? #13 Which of the following figures shown in the illustration represents incandescent lighting? EL-0122 #14 How is electrical conductor insulation classed? Example: insulation class H #15 Which of the following materials is a good electrical insulator? #16 Which of the following is the only known perfect dielectric for the purpose of serving as electrical insulation? #17 What is "the voltage per millimeter of insulation thickness that the insulation can withstand without breaking down" called? #18 What happens to the life expectancy of insulation for each 10 C rise in operating temperature? #19 Why are large cable sizes often formed as individual conductors comprised of several smaller strands? #20 When electrical cables penetrate watertight bulkheads, what must be provided for? #21 Why is copper often used as an electrical conductor? #22 How are the line losses in a distribution circuit kept to a minimum? #23 In the diagram of the switchboard shown in the illustration, what is the purpose of the current transformers? EL-0003 #24 What application would the switchboard instrumentation panel shown in the illustration best be suited for? EL-0040 #25 Which of the following represents a characteristic of an ungrounded electrical distribution system? #26 In the diagram of the switchboard shown in the illustration, if one of the turbines should fail due to a throttle trip, what will happen? EL-0003 #27 In the diagram of the switchboard shown in the illustration, what is the function of the device labeled "Gen. Bkr. Sw."? EL-0003 #28 The timer element of a reverse power relay cannot be energized unless what condition is met? #29 How is a wattmeter electrically connected in a circuit? #30 What is the name of the part of the shipboard electrical system used to control the distribution of power to the branch circuits?

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