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

USCG Marine Electrical Systems (Set 24)

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Question 1 of 30

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Question 1 of 30

The winch shown in the illustration operates in any of the positions with the master switch in the 'lower' direction, but will not 'hoist' in any of the master switch hoist speed positions. Which of the listed faults could be the cause? EL-0102

Browse Questions in Set 24

30 MCQs

#1 The winch shown in the illustration operates in any of the positions with the master switch in the 'lower' direction, but will not 'hoist' in any of the master switch hoist speed positions. Which of the listed faults could be the cause? EL-0102 #2 Refer to figure "A" representing an electric oven as shown in the illustration. With the oven turned on, the power available indicator light is off, the oven on indicator light is off, and only elements "6" and "7" appear to be producing heat. Which fuse is blown? EL-0041 #3 Refer to figures "1" and "2" of the basic synchronous transmission system shown in the illustration. Figure "1" shows a properly connected system where the receiver TR remains in correspondence with the transmitter TX. In figure "2", although properly zeroed, the receiver goes out of correspondence with the transmitter due to improper connections resulting in reverse torque direction. Which connection error results in this behavior? Illustration EL-0149 #4 An open primary coil in a simple potential transformer will be indicated by which of the listed conditions? #5 A 480/120 VAC step down control transformer as configured in figure "E" of the illustration produces 89 VAC across its secondary winding (across X1 and X2) with 480 VAC applied to the primary winding (across H1 and H2). What condition is indicated? Illustration EL-0123 #6 The individual 12 volt lead-acid batteries, when connected as shown in the illustration, as a battery bank would produce how many volts? EL-0070 #7 As shown in the illustration, the wet-cell storage batteries are connected in what configuration? EL-0071 #8 What is true concerning the installation of batteries used for diesel engine starting? #9 What is the ampere-hour rating of a lead-acid battery that can deliver 20 amperes continuously for 10 hours? #10 Three 12 volt, lead-acid, batteries connected in series will develop how many volts? #11 Why should battery rooms we well ventilated during the charging of storage batteries? #12 Which of the following procedures represents the best method to prevent the freezing of batteries continuously exposed to low temperatures? #13 Which of the following statements describes the effects of ambient temperature on local action within lead-acid storage batteries? #14 As shown in the cutaway view of the lead acid battery in figure "A" of the illustration, if one half of the battery's cells are revealed by the cutaway section (with the other half remaining hidden from view), what is the nominal output voltage of the battery? EL-0031 #15 What is the nominal open-circuit cell voltage of one lead-acid storage battery cell? #16 To keep emergency lead-acid batteries in a full state of charge for emergency use, what is normally done? #17 Assuming that the electrolyte has had sufficient time to be uniformly diffused throughout the cell, if the open-circuit cell voltage as measured by a digital multimeter is 2.12, what would be the approximate specific gravity? #18 The nominal voltage of one cell of a wet cell nickel-cadmium battery is approximately how many volts? #19 Why are nickel-cadmium batteries superior to lead-acid batteries for standby service? #20 What is the approximate discharge voltage produced by one cell of a wet type nickel- cadmium battery at 75% of charge? #21 What material are the plates of a wet cell NiCad storage battery made of? #22 What is the most reliable and preferred method for determining the state of charge of a wet-cell NiCad battery? #23 Which of the illustrated motors has an open motor enclosure? EL-0001 #24 What will be the impact of reduced voltage applied to a motor during the starting period? #25 Which of the illustrated motors has an open, drip-proof (ODP) motor enclosure? EL-0001 #26 What is he most practical method of controlling the RPM of a multi-speed AC motor operating at a constant frequency? #27 As shown in figure A" of the illustrated motor nameplate, how much current could the motor safely draw on a continuous basis at sea level without overheating? EL-0171 #28 Regarding an induction motor, what does the power developed by the rotor automatically adjust itself to? #29 Which of the following motors has a frame configuration for solid base mounting only? EL-0184 #30 Which type of AC single-phase motor will also operate on direct current?

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