Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG Marine Electrical Systems (Set 14)
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Question 1 of 30
In figure "A" of the illustration, what is the position of the circuit breaker? Illustration EL-0033
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30 MCQs #1 In figure "A" of the illustration, what is the position of the circuit breaker? Illustration EL-0033 #2 What is the resistance reading at "2" on the megger scale shown in figure "A" of the illustration? Illustration EL-0044 #3 As shown in the illustrated plots of uncorrected and temperature corrected insulation resistance readings for a particular piece of equipment, at what point in time should the equipment have been refurbished or replaced? Illustration EL-0120 #4 When a fluorescent lamp fails to light and both ends of the tube are severely darkened, what must usually be replaced? #5 What is indicated by gradual blackening at the ends of component "4" shown in figures "B" and "C" of the illustration? Illustration EL-0081 #6 During start-up of the circuit shown in figure "B" of the illustration, it is noted that the ends of component "4" alternately glow and become dark without the tube illuminating. What is the most probable cause for this condition? Illustration EL-0081 #7 In the lighting distribution circuit shown in the illustrated lighting panel L110 of the illustration, if all circuit breakers are closed and due to a problem with the relevant feeder circuit breaker, there is a loss of power on the incoming phase A, which of the following statements is true? Illustration EL-0013 #8 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? #9 As shown in the illustration of a vessels navigational lighting circuit, if port running light "1" burns out, the trouble buzzer will sound and the port running light trouble lamp will illuminate. Switching to port running light "2" clears the alarm. If port running light "1" is replaced with a light of a smaller wattage and the circuit is switched back to port running light "1", which of the following is true? Illustration EL-0058 #10 As shown in the wiring diagram of the semi-automatic navigation lighting panel circuit, what would cause the buzzer to sound and for the indicator light to illuminate in the line section for a particular navigation running light? Illustration EL-0108 #11 If all of the ground detection lamps burn with equal brilliance, whether the test button is depressed or released, what does this indicate? #12 A switchboard ammeter indicates a reading slightly above 'zero' when the leads are disconnected. What is this caused by? #13 In a three-phase electrical system, three ground detecting lamps are provided. One lamp goes dark and the others increase in brightness when the "ground test" button is pushed. What is indicated? #14 A three-phase electrical system is equipped with ground detecting lamps. If one of the lamps is dark, and remains dark when the test switch is operated, what does this indicate? #15 In an ungrounded distribution system, as compared to a normal indication, what is the indication on a switchboard of a current carrying conductor making an accidental electrical contact with a wiring metal conduit? #16 An open primary coil in a simple potential transformer will be indicated by which of the listed conditions? #17 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 with a current of 12 amps? Illustration EL-0055 #18 What would be the source current and transformer current as shown in figure "B" of the illustration, with the secondary tap connected as shown, if the supply voltage at the branch circuit breaker is 440 VAC and the unity power factor load current draw is 50 amps? Illustration EL-0083 #19 In electronic circuitry, what does the abbreviation 'PCB' commonly represent? #20 Which line in figure "B" shown in the illustration represents the trailing edge of the wave? Illustration EL-0088 #21 In comparing a semiconductor diode to a vacuum tube diode, what statement is true? #22 The multiplier prefix 'giga' (G) such as used in "gigabytes" represents what multiplication factor? #23 Which of the wave shapes shown in the illustration is termed a ramp or saw tooth wave? Illustration EL-0088 #24 To minimize magnetic field interaction between electrical conductors in physical proximity, what is the best practice? #25 Which of the following statements represents an application of a silicon controlled rectifier? #26 Capacitors are commonly used on DC power supply circuits for engine room automation consoles. For what functional purpose are they primarily used in this application? #27 All of the schematic diagrams shown in the illustration represent which of the listed solid-state circuits? Illustration EL-0069 #28 In the regulated DC power supply illustrated, what is the function of section"B"? Illustration EL-0085 #29 What is the function of section "D" of the circuit shown in the illustration? Illustration EL-0085 #30 Given the circuit and individual AC and DC voltage waveforms shown in figure "A" producing the composite voltage waveform shown in figure "B", what would be the value of the average current passing through the load resistor with a resistance of 1 ohm? Illustration EL-0075
Illustration EL-0075: the U.S. Coast Guard has not released this illustration.
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