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

USCG Marine Electrical Systems (Set 30)

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Question 1 of 30

Upon failure of the normal power supply, how is the emergency generator placed on the line to feed power to the emergency bus?

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30 MCQs

#1 Upon failure of the normal power supply, how is the emergency generator placed on the line to feed power to the emergency bus? #2 In the illustration of the one line distribution system diagram, if the ship's service generator on line fails, what statement is true concerning the operation of the emergency diesel generator? EL-0014 #3 What is a purpose of the automatic bus transfer device shown in the illustration? EL-0014 #4 Referring to the containership one-line distribution diagram shown in the illustration, what is the purpose of the transformers providing power to the refrigerated container feeder bus? EL-0014 #5 Referring to the containership one-line distribution diagram shown in the illustration, what is the purpose of the feedback circuit breaker as used to bypass the automatic bus transfer device? EL-0014 #6 Referring to the containership one-line distribution diagram shown in the illustration, what statement is true concerning the battery charger? EL-0014 #7 Which of the following statements concerning analog and digital devices is correct? #8 The multiplier prefix 'giga' (G) such as used in "gigabytes" represents what multiplication factor? #9 Which of the wave shapes shown in the illustration is termed a sinusoidal wave? EL-0088 #10 As shown in the illustrated harmonic analysis diagram, which figure represents the fundamental (or first harmonic)? EL-0163 #11 Which of the substances listed can be used to shield sensitive equipment from static magnetic fields? #12 When placed in a magnetic field, which of the materials listed will maintain the highest permeability? #13 Which line in figure "B" shown in the illustration represents the trailing edge of the wave? EL-0088 #14 Which of the pictured solid state semiconductor devices is a light-emitting diode? EL-0068 #15 A silicon controlled rectifier (SCR) is a solid state device used for what functional purpose? #16 What is the name of the semiconductor that decreases in resistance with an increase in temperature? #17 Which of the following statements correctly applies to bipolar junction transistors? #18 What does the symbol in figure "1" shown in the illustration represent? EL-0065 #19 What is the name of the component labeled CR1 as shown in section "D" of the regulated DC power supply illustrated? EL-0085 #20 In what applications are germanium semiconductor diodes commonly used? #21 In comparing a semiconductor diode to a vacuum tube diode, what statement is true? #22 What is the functional purpose of the resistor 'RL" placed in parallel to the output of a DC power supply as shown in section "D" of the regulated DC power supply? EL-0085 #23 Which of the following statements represents an application of a silicon controlled rectifier? #24 Silicon diodes which are designed for a specific reverse breakdown voltage, and are most often used as electronic power supply voltage regulators, are specifically what type of diode? #25 A signal derived from an amplifier output and returned to the amplifier input is called what type of signal? #26 In which section of the 24 VDC power supply circuit illustrated does the greatest change in voltage level take place when fed from 120 VAC ship's power? EL-0085 #27 What is the correct term for the fluctuation of voltages in figure "H" shown in the illustration? EL-0085 #28 A common-emitter circuit has an input voltage of 0.1 volt, an output voltage of 2.0 volts, an input current of 0.5 milliamps, and an output current of 10 milliamps. What is the power gain? #29 What does the circuit shown in the illustration represent? EL-0085 #30 The component labeled 'CR1' in the circuit shown in the illustration serves what functional purpose? EL-0085

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