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

USCG Marine Electrical Systems (Set 34)

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Question 1 of 30

What is the functional purpose of the 'LSL' contacts for the hoist controller circuit shown in the illustration? EL-0102

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30 MCQs

#1 What is the functional purpose of the 'LSL' contacts for the hoist controller circuit shown in the illustration? EL-0102 #2 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? #3 What is the functional purpose of the 'MS 2' contacts in the hoist controller circuit shown in the illustration? EL-0102 #4 As shown in the illustration, how are the rotor windings of the motor configured? EL-0102 #5 When the control handle is in the 'off' position, what is the status of the solenoid actuated brake of an electric winch? #6 What type of motor is used in the AC hoist controller as shown in the illustration? Illustration EL-0102 #7 Which of the listed conditions occur when selection is made for 'third point hoist' on the winch hoist controller shown in the illustration? EL-0102 #8 As shown in the illustration, what is responsible for maintaining the "UV" relay energized when the master switch handle is moved away from the "off" position? EL-0102 #9 What is the name of the mechanism used to transmit rudder angle information from the steering gear itself to the wheelhouse in the illustrated rudder angle indicator system? EL-0092 #10 When power is restored after a complete power failure, how will the steering gear pump motor which was on-line respond? #11 As shown in figure "A" of the illustration, the actual rudder angle repeatback signal originates at what device and is delivered to what other device? EL-0097 #12 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? EL-0092 #13 What does figure "C" of the illustration represent? EL-0092 #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 What is the name of the mechanism used to transmit torque angle over distance in the illustrated rudder angle indicator system? EL-0092 #16 The electrical energy necessary to power a sound-powered telephone's small vibrating bell is obtained from what power source? #17 What type of equipment does the wiring diagram shown in the illustration represent? EL-0093 #18 Referring to the sound-powered telephone circuit shown in the illustration, in what component are the sound-powered transmitter and receiver units located? EL-0093 #19 Referring to the sound-powered telephone circuit shown in illustration, what statement is true concerning the button on the handset as represented by the component labeled "A"? EL-0093 #20 If overloading an electric motor becomes necessary in an emergency situation, what should be done to prevent damage to the motor while allowing sustained operation? #21 What should be included in the routine periodic maintenance checks for electrical motors? #22 When regreasing the electric motor bearing as shown in figure "B" of the illustration, what practice should be avoided? EL-0218 #23 When testing insulation resistance of electric equipment and machinery, ideally when should the insulation resistance be tested for the lowest normal insulation values? #24 What would be the indication of a grounded switch or cable as measured by a megohmmeter? #25 As shown in the illustrated plots of uncorrected and temperature corrected insulation resistance readings for a particular piece of equipment, at what point in time should the equipment have been refurbished or replaced? Illustration EL-0120 #26 Before any work on electrical or electronic equipment is performed, which of the following precautions should be carried out? #27 What should you be aware of when checking the specific gravity of the battery electrolyte with a hydrometer? #28 For accuracy purposes, which of the following devices should be used to measure the temperature of a battery electrolyte? #29 Which of the substances listed should be applied to battery terminals to help prevent corrosion? #30 Which of the listed battery charging circuits is used to maintain a wet-cell, lead-acid, storage battery in a fully charged state during long periods of disuse?

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