ELECTRICIAN`S MATE Quiz 05

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david11090
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ELECTRICIAN`S MATE Quiz 05
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2013-09-01 01:48:22
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ELECTRICIAN`S MATE Quiz 05
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ELECTRICIAN`S MATE Quiz 05
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  1. Limit switches are installed so they are connected in what configuration with (a) the master switch and (b) the voltage supply circuit?



    • 
    (a) Parallel (b) parallel

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    (a) Parallel (b) series

    • 
    (a) Series (b) series

    • 
    (a) Series (b) parallel
    (a) Series (b) series
  2. Kickpipes that penetrate wooden decks should be made from what material?



    • 
    Aluminum
    • 
    Neoprene

    • 
    Steel

    • 
    Iron
    Aluminum
  3. What is the size and designation for casualty power cables on ac power systems?



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    LSFHOF-48

    • 
    LSDHOF-93

    • 
    LSTHOF-42

    • 
    LSMHOF-3
    LSTHOF-42
  4. If local lighting switches are double pole, leaving them open allows their insulation resistance to be measured when testing the local branch circuit.



    • 
    True

    • 
    False
    False
  5. To actuate a phase-failure relay, what action must take place?



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    An imbalance between the flux produced in the relays in the Rectox unit

    • 
    An imbalance of current through the relay coils 

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    A flux cancellation between the flux produced by one relay and one coil in the Rectox unit, and the flux produced by the other relay coil and the other coil in the Rectox unit

    • 
    A flux cancellation between the flux produced in the relay coils and the flux produced in the coils in the Rectox unit
    An imbalance of current through the relay coils 
  6. Shore power is supplied to the ship through the use of (a) what specific length of (b) what type of cable?



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    (a) 150 feet (b) TSGU-400

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    (a) 175 feet (b) THOF-400

    • 
    (a) 150 feet (b) THOF-400

    • 
    (a) 175 feet (b) TSGU-400
    (a) 150 feet (b) THOF-400
  7. What is used to compensate for variations in reactance of the reactors introduced during manufacturing?



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    A bridge rectifier is placed in series with the reactors

    • 
    Two resistors 

    • 
    Two 2-coil reactors

    • 
    An inductor is placed in each Rectox
    Two resistors
  8. Shipboard lighting transformers in a 60-hertz circuit are constructed using what class insulation?



    • 
    Class O

    • 
    Class A

    • 
    Class B 

    • 
    Class C
    Class B
  9. You would use a nomograph when taking what measurement?



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    To correct a resistance reading of a piece of equipment

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    The resistance/foot of a cable

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    To correct a resistance reading of a cable 

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    To translate a resistance reading to a temperature index
    To correct a resistance reading of a cable
  10. The polarity of the voltage applied to the potential coil on a reverse-current relay will remain the same when the generator terminal current is reversed.



    • 
    True 

    • 
    False
    True
  11. What type of cable is used to connect fixed terminals that penetrate decks and bulkheads?



    • 
    LSDSGU-75

    • 
    LSTHOF-75

    • 
    LSDHOF-75

    • 
    LSTSGU-75
    LSTSGU-75
  12. To provide or install shore power to a ship requires which of the following equipment?



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    Shore power station and receptacle

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    Connecting cable

    • 
    Cable plug

    • 
    All of the above
    All of the above
  13. The shore-power system is designed to provide enough power for all equipment normally energized while at sea.



    • 
    True

    • 
    False
    False
  14. A thermal overload relay is adjusted to trip at a predetermined value. What action can you take to vary the tripping current?



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    Change the relative position of the contacts

    • 
    Rotate the splitter arm

    • 
    Move the relay heater coil 

    • 
    Raise and lower the dashpot plunger
    Move the relay heater coil
  15. When two or more dc generators are connected in parallel, what device disconnects a generator from the line if the generator starts drawing power from the line?



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    A thermal-type relay

    • 
    A reverse-current relay

    • 
    A magnetic-type relay

    • 
    A reverse-power relay
    A reverse-current relay
  16. Casualty power cable leads are color coded for identification. What are the proper colors for A, B, and C phases, respectively?



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    Red, black, and white

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    Red, white, and black

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    Black, red, and white

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    Black, white, and red
    Black, white, and red
  17. What is a pilot device?



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    A small device that controls other small devices

    • 
    A large device that controls a small device

    • 
    A large device that controls other large devices

    • 
    A small device that controls a large device
    A small device that controls a large device
  18. If a cable has been energized for 6 hours, what temperature should the cable be assumed to be for purposes of heating resistance?



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    40°F

    • 
    104°F

    • 
    70°F

    • 
    90°F
    70°F
  19. What is the limiting temperature of a piece of equipment with class N insulation?



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    155°C

    • 
    200°F

    • 
    180°F

    • 
    200°C
    200°C
  20. Electrical insulating materials are classified according to what characteristic?



    • 
    Their temperature index

    • 
    Their material composition

    • 
    Their resistivity coefficient

    • 
    Their thickness
    Their temperature index
  21. You are connecting casualty power cables in a dark compartment. What conductor feature is identified by three separate servings of twine or O-rings?



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    Phase C

    • 
    The conductor polarity

    • 
    Phase A

    • 
    The neutral connection
    Phase C
  22. You are testing the phase sequence of a shore connection. What is indicated by a clockwise rotation of the phase sequence indicator?



    • 
    Incorrect phase at the shore station

    • 
    Three-phase power is not available

    • 
    Correct phase sequence

    • 
    High voltage at the shore station
    Correct phase sequence
  23. What type of protection is provided by reversepower relays?



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    They prevent loss of power to the prime movers

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    They protect the generators from damage by motoring prime movers

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    They limit the amount of circulating current between paralleled generators

    • 
    They prevent the motoring generator from damaging the prime movers
    They prevent the motoring generator from damaging the prime movers
  24. When measuring the insulation resistance of a complete lighting circuit with a Megger, what is the minimum desired resistance to ground?



    • 
    500,000 

    • 
    More than 1 M

    • 
    1

    • 
    Less than 1
    500,000
  25. When measuring the insulation resistance of an armored power cable with a Megger, what is the maximum desired resistance from the cable armor to ground?



    • 
    0

    • 
    Greater than 1 M

    • 
    1 M 

    • 
    100W
    1 M

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