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

USCG Marine Electrical Systems (Set 26)

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Question 1 of 30

As shown in figure "B" of the illustration, what does the M-G set's three-phase drive motor mechanically drive? EL-0101

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30 MCQs

#1 As shown in figure "B" of the illustration, what does the M-G set's three-phase drive motor mechanically drive? EL-0101 #2 If a DC motor has its armature and field connected across a resistor when the motor is disconnected from its power supply, what statement is true? #3 What is an advantage of DC motors over AC motors? #4 The torque produced by a DC motor armature is the multiplication product of two factors, one being the density of the magnetic flux which is dependent upon the field current. What is the other multiplication factor? #5 As shown in the illustration, which brush holder would be appropriate to use in a bi- directional motor? EL-0029 #6 As shown in the illustration, which brush holder is of the reaction type? EL-0029 #7 Which of the following types of DC motors is considered to produce the highest starting torque? #8 In a series wound motor, the current passing through the field windings also passes through what component? #9 How is the speed of a series wound winch motor controlled? #10 What type of DC motor is never connected to a belt driven load? #11 What type of DC motor has extremely high starting torque, but has poor inherent speed regulation? #12 The wiring diagram found in figure "C" of the illustration represents what type of DC motor? EL-0054 #13 What type of DC motor has relatively low starting torque, but has excellent inherent speed regulation? #14 In a shunt wound DC motor, how is the shunt field connected? #15 What are the characteristics of the field winding of a shunt wound motor? #16 The wiring diagram found in figure "A" of the illustration represents what type of DC motor? EL-0054 #17 What statement is true concerning speed control of a shunt wound DC motor? #18 The wiring diagram found in figure "B" of the illustration represents what type of DC motor? EL-0054 #19 Which of the listed DC compound motor connection schemes is the most commonly used? #20 When a compound wound DC motor is cumulatively compounded, what does this mean? #21 When a compound wound DC motor is differentially compounded, what does this mean? #22 Assuming that a cumulatively compounded DC motor is fitted with interpoles and compensating windings, normally how is the direction of rotation in such a DC motor reversed? #23 What is the purpose of an electro-magnetic relay? #24 Which of the following statements represents the main difference between a relay and a contactor? #25 What is the functional name of an electrical device which prevents simultaneous energization of loads thereby preventing damage or injury? #26 Which of the following illustrated manual motor starters represents the wiring diagram illustrated in figure "A"? EL-0023 #27 What is one function of the movable cams in a drum-type winch motor controller? #28 What is the name of the type of motor control circuit that will not permit automatic restarting after power is restored, following a power failure? #29 As shown in the illustration, by what means are all the 'MS' contacts are opened and closed? EL-0073 #30 If a three-phase motor controlled by the control circuit illustrated in figure "B" of the illustration, is running in the forward direction, which of the following sequences must occur before the motor will reverse rotation? EL-0011

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