Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG Marine Electrical Systems (Set 37)
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Question 1 of 30
There are very specific rules that govern the testing of generators found in the appropriate publication incorporated by reference. According to 46 CFR, Subchapter J (Electrical Engineering), which agency publishes the rules for the construction and testing of generators.
Browse Questions in Set 37
30 MCQs #1 There are very specific rules that govern the testing of generators found in the appropriate publication incorporated by reference. According to 46 CFR, Subchapter J (Electrical Engineering), which agency publishes the rules for the construction and testing of generators. #2 You are in the planning stages of setting the longtime over current trip of a ship's service generator circuit breaker. According to 46 CFR, Subchapter J (Electrical Engineering), what statement is true regarding the criteria for the longtime over current trip set point, assuming the generator is capable of being paralleled? #3 Assuming that a ship's service generator is directly coupled to the prime mover, what condition must cause a prime mover to automatically shut down? #4 According to 46 CFR, Subchapter J (Electrical Engineering), emergency diesel engine starting systems are required to have sufficient capacity to provide power for at least how many consecutive starts? #5 Emergency generators are required to automatically start upon a loss of normal supply voltage, according to 46 CFR, Subchapter J (Electrical Engineering). In conducting a test of the emergency generator automatic transfer of load function, if the normal system supply voltage is 450 VAC, to what value would the emergency generator output voltage have to rise to trigger the automatic transfer of emergency loads to the emergency generator? #6 Emergency generators are required to automatically start upon a loss of normal supply voltage, according to 46 CFR, Subchapter J (Electrical Engineering). In conducting a test of the emergency generator automatic transfer of load function, if the normal system supply voltage is 480 VAC, to what value would the normal source output voltage have to rise to trigger the automatic transfer of emergency loads back to the normal power source? #7 According to 46 CFR, Subchapter J (Electrical Engineering), which of the following starting aids is the ONLY method allowed to ease the starting of emergency diesel generator engines? #8 According to 46 CFR, Subchapter J (Electrical Engineering), in response to a loss of normal power or a simulated test, when will the emergency loads automatically be transferred to the emergency diesel generator? #9 According to 46 CFR, Subchapter J (Electrical engineering), regulations prohibit the use of portable electric cord or fixture wire aboard ship if that wire or cord is smaller than what size? #10 According to 46 CFR, Subchapter J (Electrical Engineering), what statement is true concerning the use of twist-on connectors? #11 According to CFR, Subchapter J (Electrical Engineering), which of the following statements is true concerning flexible electric cord and cable used aboard ship? #12 According to 46 CFR, Subchapter J (Electrical Engineering), when considering replacement, instrument and control wiring in a switchboard is to be of what minimum size? #13 Electrical wire in general, when used aboard vessels must meet minimum requirements. Which of the following statements is/are correct? #14 You are in the planning stages of making up a portable cable to be used for transmitting power from a battery charger on a ship to a charging receptacle on a lifeboat. According to 46 CFR, Subchapter J (Electrical Engineering), which of the following statements is true regarding the transmitting of power between receptacles? #15 It is desired to add additional 120 VAC, 100 watt lighting fixtures in the accommodations, port side fed from circuit #1 (1L110) as illustrated in the lighting panel L110 of the illustration. According to 46 CFR 111.75-5, would be the maximum allowable additional lighting fixtures that could be installed? EL-0013 #16 According to CFR 111.75-5, what would be the maximum amperage load on circuit #2 (2L110) of the illustrated lighting panel board L110 of the illustration? EL-0013 #17 According to 46 CFR, Subchapter J (Electrical Engineering) regulations, receptacle outlets at or above what voltage are required to have grounding poles? #18 According to 46 CFR, Subchapter J (Electrical Engineering) regulations, what is the minimum conductor size associated with a 25 or 30 ampere lighting branch circuit supplying a non- switched cargo hold light fixture? #19 What is the primary means by which an electrical maintenance worker is protected from electrical hazards while performing work on an electrical circuit? #20 Which of the following voltage testers would be associated with high quality, be safe to use, and minimize the electric shock hazard? #21 Which of the following devices would be forbidden to use as a primary means of electrical isolation? #22 Before electrical work can be safely undertaken, the equipment must be de-energized, locked and tagged out, and verification must be made that the circuit is actually dead. What testing device is most certain to reliably verify that a circuit is actually dead? #23 With all other factors considered equal (such as voltage, conducting path through the body and the duration of contact), contact with an energized electrical system conductor of which system type would produce the most damaging effect? #24 At a minimum threshold, how many milliamps of current through the body produces a condition where most people would suffer ventricular fibrillation and could only be resuscitated with a ventricular defibrillator? #25 At a minimum threshold, how many milliamps of current through the body produces a condition where most people would experience respiratory paralysis and be unable to breathe while still in contact with the energized conductor? #26 At a minimum threshold, how many milliamps of current through the body produces a condition where most people would be unable to let go of the energized electrical conductor due to involuntary muscular contraction? #27 After prior isolation and lockout/tagout procedures are performed, which electrical device requires discharging any stored electrical energy before any work may safely begin? #28 At a minimum threshold, how many milliamps of current through the body produces a painful sensation that most people would perceive as an electric shock? #29 In figure "B" of the illustrated circuit, if the resistance of R1 is 10 ohms, R2 is 10 ohms, and R3 is 10 ohms, what is the total resistance? Illustration EL-0032 #30 What would be the terminal voltage and ampere-hour capacity of the battery bank illustrated if each battery was rated at 75 ampere-hours and 12 volts? EL-0107
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