Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG Marine Electrical Systems (Set 6)
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Question 1 of 30
Concerning the illustrated fire detection and alarm system, what statement is true concerning the wiring between zones? Illustration EL-0114
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30 MCQs #1 Concerning the illustrated fire detection and alarm system, what statement is true concerning the wiring between zones? Illustration EL-0114 #2 Impressed current cathodic hull protection systems are commonly used on modern vessels. What are these systems designed to replace or reduce? #3 For more complete vessel protection when using an impressed current cathodic system, what other features are built into the system? #4 As part of a routine maintenance program for deck machinery motor controllers, what should be done? #5 If deck machinery is expected to be idle for an extended period of time, what should be done? #6 As shown in figure "1" of the illustration, a correctly connected synchronous transmission causes the receiver to be in correspondence with the transmitter. If the receiver is out of correspondence, 180 degrees out of zero, but the torque direction is correct as shown in figure "2", what figure shows the incorrect connections responsible for this condition? Illustration EL-0150 #7 As shown in the illustrated wiring diagram for an engine order telegraph system, what statement concerning the constant ringing and trouble alarm is true? Illustration EL-0113 #8 Erratic operation of the device represented in the diagram labeled "A" shown in the illustration could be traced to what condition? Illustration EL-0092 #9 If it is required that the coils 'R1-R2-R3' in the indicator of figure "A", turn opposite to those in the transmitter, as shown in the illustration, what action should be taken? Illustration EL-0092 #10 Which of the following conditions will occur if the brake solenoid coil burns out on a cargo winch with an electrical brake? #11 The winch shown in the illustration will operate normally in all speeds in both directions, with the exception that it will not accelerate into 'fifth point' hoist or 'fifth point' lower. What would be a possible cause? Illustration EL-0102 #12 As shown in the illustration, what is responsible for maintaining the "UV" relay energized when the master switch handle is moved away from the "off" position? Illustration EL-0102 #13 In the system shown in the illustration, the engine room station is unable to signal any other station, nor is any other station able to signal the engine room station. The engine room station can, however, ring itself by proper positioning of its selector switch. What is the most probable cause of this problem? Illustration EL-0093 #14 In the circuit 'B' of the illustration, what would be the result of the upper heating element being burned out and open circuited? Illustration EL-0041 #15 What will be the resulting current when a voltage of 110 VDC is applied to a resistance of 32 ohms in figure "A" of the illustrated circuit when the switch is closed? Illustration EL-0018 #16 If the voltage supplied to the lighting circuit is 110 volts, how much current is drawn by a 100 watt light bulb? #17 An electrical component is connected across a 120 volt 60 hertz AC supply. What is the current drawn by the component if the impedance is 200 ohms? #18 What will be the resulting current when a voltage of 115 VDC is applied to a resistance of 12 ohms in figure "A" of the illustrated circuit with the switch closed? Illustration EL-0018 #19 What would be the total current flowing in the circuit shown in figure "B" of the illustration if the source is 30 volts, the resistance of R1 is 10 ohms, R2 is 10 ohms and R3 is 10 ohms, respectively? Illustration EL-0032 #20 In a simple DC circuit, the resistance is held constant while the applied voltage is halved. What will be the effect on the current flow as compared to the original current? #21 What will be the resulting current when a voltage of 442.7 VDC is applied to a resistance of 1.25 ohms in figure "A" of the illustrated circuit when the switch is closed? Illustration EL-0018 #22 What is the current flow through R1 of the circuit in figure "B" of the illustration with the switch closed if the resistance of R1 is 2 ohms, R2 is 3 ohms and R3 is 6 ohms and the battery voltage is 12 VDC? Illustration EL-0019 #23 A lamp has a source voltage of 110 volts and a current of 0.9 amps. What is the hot resistance of the lamp filament? #24 What is the total resistance of figure "B" of the illustrated circuit if the resistance of R1 is 3 ohms, R2 is 4 ohms, and R3 is 5 ohms? Illustration EL-0020 #25 What is the total resistance of the electrical circuit illustrated in figure "B" if the resistance of R1 is 2 ohms, R2 is 4 ohms, and R3 is 4 ohms and the battery voltage is 6 volts? Illustration EL-0019 #26 In figure of "A" of the illustrated circuit, what is the voltage measured across R1 if the battery voltage is 24 volts, the resistance of R1 is 34 ohms, and the resistance of R2 is 126 ohms when the switch is closed? Illustration EL-0020 #27 As shown in figure "A" of the illustration if the applied voltage is 12 VDC, the resistance of R1 is 10 ohms, and R2 is 10 ohms what is the current flowing through R1 when the switch is closed? Illustration EL-0020 #28 What is the voltage across 'R1' of figure "B" of the illustrated circuit with the switch closed if the applied voltage is 24 volts and resistance of R1 is 3 ohms, R2 is 4 ohms, and R3 is 5 ohms, respectively? Illustration EL-0020 #29 What would be the voltage drop across the parallel branches of the circuit shown in figure "B" of the illustration if the source voltage is 30 volts, the resistance for R1 is 10 ohms, the resistance for R2 is 10 ohms and the resistance for R3 is 10 ohms? Illustration EL-0032 #30 What would be the terminal voltage and ampere-hour capacity of the battery bank if each battery was rated at 50 amp-hours and 6 volts? Illustration EL-0107
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