Pass Benchmark: 70% (21/30) • Standard: USCG NMC / 46 CFR
USCG Marine Electrical Systems (Set 11)
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Question 1 of 30
Which of the illustrated schematic symbols represents the type of switch pictured in figure "F" of the illustration? Illustration EL-0026
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30 MCQs #1 Which of the illustrated schematic symbols represents the type of switch pictured in figure "F" of the illustration? Illustration EL-0026 #2 Which electrical schematic symbol represents a normally open thermostat? Illustration EL-0059 #3 Which of the electrical schematic symbols represents a normally open limit switch? Illustration EL-0059 #4 What is statement is true in reference to reading electrical motor controller elementary diagrams? #5 What type of electrical diagram is shown in figure "B" of the illustration? Illustration EL-0007 #6 The electrical diagram shown in figure B of the illustration represents what type of DC motor? Illustration EL-0054 #7 Which of the following statements concerning electrical cables is correct? #8 Why are large cable sizes often formed as individual conductors comprised of several smaller strands? #9 The 24 volt DC bus on the emergency switchboard is used to supply power to what system or equipment? #10 What is a common type of protective covering used on electrical conductors? #11 What is the reason that some electric cables are formed of stranded wire? #12 In the illustrated one line diagram, if the ship's service generator on line fails, what statement is true concerning the operation of the emergency diesel generator? Illustration EL-0014 #13 As shown in figure "B" of the illustration, with respect to the common equipment grounding conductor, what statement is true? Illustration EL-0125 #14 As shown in the illustration, which of the following pieces of equipment is provided with a remote pushbutton station? Illustration EL-0165 #15 As shown in the illustrated one-line diagram of a two-tiered emergency power system for a passenger ship, what statement is true? Illustration EL-0166 #16 Which of the illustrated safety disconnect switches represents a double throw switch? Illustration EL-0176 #17 Why is copper often used as an electrical conductor? #18 Which of the following characteristics is most critical in determining the wire gauge size of the cable to be used in a particular circuit? #19 What is the characteristic that is associated with an "instantaneous-trip" single- element type fuse? #20 How would a circuit with a blown fuse be described? #21 For what purpose are time delayed or delayed action-type fuses used? #22 Which of the following precautions should be taken when a blown fuse, rated at 10 amperes, is replaced? #23 How are fuses rated? #24 In a dual element time-delay cartridge-type fuse, what type of protection is provided for motor applications? #25 By what means does a molded-case circuit breaker provide protection against short circuits? #26 How will a molded-case circuit breaker with a thermal trip unit react immediately after it has tripped, as a result of an overloaded motor circuit? #27 How can a motor be protected from overheating due to sustained motor overload? #28 In figure "1" of the illustration, what are the trip characteristics associated with this type of circuit breaker? Illustration EL-0033 #29 By what means is protection against sustained overloads occurring in molded-case circuit breakers provided? #30 The arc resulting from the tripping of a circuit breaker is prevented from damaging the contacts. How is this done?
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