Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG Marine Electrical Systems (Set 12)
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Question 1 of 30
When the operating handle of a molded-case circuit breaker is in the mid-position, what is the indication for the position of the circuit breaker?
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30 MCQs #1 When the operating handle of a molded-case circuit breaker is in the mid-position, what is the indication for the position of the circuit breaker? #2 A thermal-magnetic circuit breaker for a 300 KW alternator is rated at 500 amperes at full continuous load. Which of the following conditions will trip the breaker? #3 How does a circuit breaker differ from a fuse? #4 Under voltage trips are frequently installed on switchboard circuit breakers for what reason? #5 How is electrical conductor insulation classed? Example: insulation class H #6 Which of the following materials is a good electrical insulator? #7 As shown in the illustration, what event would give the same indication that would occur when a stern light circuit fuse blows open? Illustration EL-0058 #8 What is the purpose of the capacitor within component "5" of the circuit shown in figure "B" of the illustration? Illustration EL-0081 #9 What type of circuit is represented by the diagram shown in the illustration? Illustration EL-0058 #10 A shown in the illustration, which of the lighting fixtures represents an incandescent bulb? Illustration EL-0122 #11 Besides the fluorescent lamp itself and possibly a starter, which of the following components is included in a fluorescent lighting fixture? #12 Which of the listed types of lighting fixtures does the diagram shown in figure "A" of the illustration represent? Illustration EL-0081 #13 What is the functional purpose component "5" as shown in figure "B" of the illustration? Illustration EL-0081 #14 Incandescent lamps are classified according to the shape of the bulb and the type of service, as well as the size and style of the base. How are incandescent lamps rated? #15 As shown in the illustration, the change-over switch is what type of device? Illustration EL-0058 #16 As shown in the illustration, what are the characteristics of the trouble relay contacts? Illustration EL-0058 #17 When will the timer element of a reverse power relay activate the relay? #18 Which of the following represents a characteristic of an ungrounded electrical distribution system? #19 What is a wattmeter used to measure and indicate? #20 The true power indicated by a wattmeter depends on the current flow through the load, the magnitude of the voltage across the load, and what other factor? #21 What is a bus disconnect link used to isolate? #22 Capacitors can be used in electric distribution systems to improve power factor. This is accomplished by seesawing energy between the capacitor and what device or devices? #23 Ammeters and voltmeters used in sinusoidal AC power systems indicate which of the following values of the waveforms measured? #24 What is meant by a 'dead front' switchboard? #25 What is a purpose of the automatic bus transfer device shown in the illustration? Illustration EL-0014 #26 In comparison to a main switchboard for a DC electrical distribution system, a main switchboard for an AC electrical distribution system requires the use of which of the following devices, whereas a DC main switchboard does not? #27 What statement is true concerning a ground in an 450 VAC electrical circuit outside the engine room? #28 How are the line losses in a distribution circuit kept to a minimum? #29 What is the name of the part of the shipboard electrical system used to control the distribution of power to the branch circuits? #30 Which of the following is a pictured three phase power transformer, usually used to step down line voltage for supplying reduced voltage lighting circuits? Illustration EL-0177
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