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

USCG Marine Electrical Systems (Set 5)

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Question 1 of 30

A main switchboard synchronizing panel is fitted with two synchronizing lamps and a synchroscope. When paralleling, if the synchroscope pointer is at the noon position and one synchronizing light is bright while the other remains dark, what does this indicate?

Browse Questions in Set 5

30 MCQs

#1 A main switchboard synchronizing panel is fitted with two synchronizing lamps and a synchroscope. When paralleling, if the synchroscope pointer is at the noon position and one synchronizing light is bright while the other remains dark, what does this indicate? #2 When an alternator is to remain idle for even a few days, what should be done? #3 Which of the following materials is recommended for burnishing the slip rings of an alternator after grinding or turning? #4 How may chattering of the collector/slip ring brushes on a generator be remedied? #5 Which of the following statements, concerning the cleaning maintenance of a brushless generator, is correct? #6 In performing routine maintenance of a ship's service alternator, what should be included? #7 If rotor-to-stator air gap readings for an electrical generating machine have changed significantly from the last reading, what should be checked? #8 Rotor-to-stator air gap readings should be periodically taken for electrical generation equipment. What is the best tool to use to take these measurements? #9 With regard to the maintenance of electrical generating machines with insulated pedestal bearings, what practice should be avoided? #10 If a shipboard AC generator experiences a failure to produce a voltage, what may be the cause? #11 What may be the cause of an AC generator to fail to produce a voltage? #12 An open occurring within the field rheostat of an AC generator can be detected by short circuiting its terminals and making specific observations. What should be checked for? #13 How can the loss of residual magnetism in an alternator or generator be corrected? #14 In actual applications, electrical connections associated with 'R1, R2 and R3' of the transmitter to 'R1, R2, and R3' of the indicators shown in figure "C" of the illustration are made by what means? EL-0092 #15 If coil 'R1-R2-R3' on the transmitter in figure "C" shown in the illustration is turned 30 degrees clockwise, how will the corresponding coils 'R1-R2-R3' on the receivers (indicators) respond? Illustration EL-0092 #16 As shown in figure "A" of the illustration, fine adjustments such as "rate of turn signal" have no effect on steering stand operation when the 'operation selector switch' is in what position? Illustration EL-0097 #17 What controls rudder movement when the Operation Selector Switch shown in figure "A" of the illustration is in the "Controller" position? Illustration EL-0097 #18 When power is restored after a complete power failure, how will the steering gear pump motor which was on-line respond? #19 What is the functional purpose of the 'LSH' contacts for the hoist controller circuit shown in the illustration? Illustration EL-0102 #20 As shown in the illustration, what is the functional purpose of the normally closed and normally open auxiliary contacts of the hoist and lower contactors respectively? Illustration EL-0102 #21 Which of the listed conditions occur when '4th point lower' is selected on the winch hoist controller shown in the illustration? Illustration EL-0102 #22 What functionality do the 'MS 1' contacts of the master switch shown in the illustration provide? Illustration EL-0102 #23 The progressive operation of the contactors marked "1A" through "4A" provide the winch hoist controller shown in the illustration with what functionality? Illustration EL-0102 #24 What is the function of the electric brake on an deck cargo winch? #25 In the event of a power failure during cargo loading operations, the movement of an electric powered cargo winch will be stopped by what means? #26 When the control handle is in the 'off' position, what is the status of the solenoid actuated brake of an electric winch? #27 What does the component labeled "B" shown in the illustration represent? Illustration EL-0093 #28 As shown in the illustration, which of the following statements is correct concerning the circuits in a sound powered telephone system? Illustration EL-0093 #29 The pushbutton on the handset of a ship's sound-powered telephone must be depressed in order to do what? #30 Where is the power necessary to energize the howler "relay" coil at the engine room station as shown in the illustration? Illustration EL-0093

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