ELECTRICIAN`S MATE Quiz 06

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david11090
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ELECTRICIAN`S MATE Quiz 06
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2013-09-01 01:47:47
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ELECTRICIAN`S MATE Quiz 06
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ELECTRICIAN`S MATE Quiz 06
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  1. Which of the following trip elements should NOT be used on the AQB-A250 circuit breaker?



    • 
    150 A

    • 
    300 A

    • 
    125 A

    • 
    275 A
    300 A
  2. The output of all ac generators is generated in what winding?



    • 
    The field winding

    • 
    The armature winding 

    • 
    The stator winding

    • 
    The rotor winding
    The armature winding
  3. What indication is given if lamp C is dim when switch S is closed?



    • 
    Phase C has a ground

    • 
    Phase B is shorted

    • 
    Phase A is open

    • 
    Phase C has a partial open
    Phase C has a ground
  4. On small ships, locating distribution panels centrally with respect to the load and feeding them directly from the generators has which of the following advantages?



    • 
    It simplifies the installation

    • 
    It reduces the weight and space requirements

    • 
    It reduces equipment requirements

    • 
    Each of the above
    Each of the above
  5. Which of the following conditions is most likely to cause a relay magnet to chatter?



    • 
    Rusty magnet sealing surfaces
    • 
    Open coils

    • 
    Burned contacts

    • 
    Shorted coils
    Rusty magnet sealing surfaces
  6. You are troubleshooting a circuit and you want to know the maximum allowed current. This information is marked on which, if any, of the following plates?



    • 
    Distribution panel circuit information plate

    • 
    Distribution panel cabinet information plate

    • 
    Cable identification plate

    • 
    None of the above
    None of the above
  7. Aboard ships, switchgear groups are physically separated as much as practical for what reason?



    • 
    To prevent accidental loss of power

    • 
    To prevent unnecessary weight during construction

    • 
    To afford greater protection from damage during battle 

    • 
    To allow easy access for maintenance
    To afford greater protection from damage during battle
  8. Selective tripping is useful aboard ship for what reason?



    • 
    It isolates faulty circuits without interrupting other associated circuits 

    • 
    It systematically opens all circuits when damage occurs

    • 
    It maintains overcurrents where fuses will not

    • 
    It allows overcurrents to flow in the circuits
    It isolates faulty circuits without interrupting other associated circuits
  9. What information is contained on circuit information plates located on distribution panels?



    • 
    The circuit number, the name of the circuit controlled, and the space served 

    • 
    The space served and the circuit number only

    • 
    The circuit number and the name of the circuit controlled only

    • 
    The space served, the circuit number, and the circuit power used
    The circuit number, the name of the circuit controlled, and the space served
  10. Which of the following is NOT a function provided by switchboards aboard ships?



    • 
    Control, monitoring, and protection of the ship’s service generators

    • 
    Automatic shifting of power to alternate sources if normal power is lost 

    • 
    Circuit protection

    • 
    Distribution of three-phase, 450-volt power
    Automatic shifting of power to alternate sources if normal power is lost
  11. If lamp A is out when switch S is open, what problem is indicated?



    • 
    Lamp A is burned out

    • 
    Phase A is grounded

    • 
    Phase A is partially grounded

    • 
    Phases B and C are shorted
    Phase A is grounded
  12. Which of the following circuit breakers must be manually operated to interrupt current flow?



    • 
    Type NQB

    • 
    Type NLB

    • 
    Both 1 and 2 above

    • 
    Type ACB
    Type ACB
  13. For what reason, if any, is the phase sequence important to the distribution system aboard ship?



    • 
    An improper phase sequence will cause voltage fluctuations

    • 
    The phase sequence determines the amount of current available

    • 
    The phase sequence determines the direction of rotation of three-phase motors 

    • 
    None; the phase sequence has no effect on the distribution system
    The phase sequence determines the direction of rotation of three-phase motors
  14. A magnetic-type overload dashpot relay tends to trip before the overload current becomes excessive. How can you adjust the relay to trip at a greater current?



    • 
    Raise the indicating plate

    • 
    Lower the indicating plate

    • 
    Raise the plunger by turning the dashpot in a forward direction

    • 
    Lower the plunger by turning the dashpot in a reverse direction
    Lower the plunger by turning the dashpot in a reverse direction
  15. Revolving armature generators are seldom used for what reason?



    • 
    They are more expensive to operate

    • 
    They are subject to arc-over at high voltages 

    • 
    Their output power is conducted through fixed terminals

    • 
    They are physically larger than other types of generators
    They are subject to arc-over at high voltages
  16. Which, if any, of the following systems make(s) up the power distribution system?



    • 
    The casualty power system

    • 
    The emergency power system

    • 
    The ship’s service system

    • 
    All of the above
    All of the above
  17. At what interval should the connections of new portable electric wiring be tested?



    • 
    Before being used for the first time

    • 
    Annually

    • 
    Semiannually

    • 
    Before every use
    Before being used for the first time
  18. The instantaneous trip setting of the AQB-A250 circuit breaker is adjusted by using what components?



    • 
    Shunt trips

    • 
    Thermal studs

    • 
    Trip coils

    • 
    Adjusting wheels
    Adjusting wheels
  19. While testing the power cord of a portable electric drill, you notice a fluctuation in the resistance reading. The fluctuating resistance reading indicates which of the following problems?



    • 
    A short

    • 
    A ground

    • 
    A faulty cable 

    • 
    Each of the above
    A faulty cable
  20. What service is provided by bus transfer equipment?



    • 
    Prevention of overloading the generator circuit breakers

    • 
    Prevent paralleling of two switchboards if the voltage and current relationships are improper

    • 
    Short-circuit protection to the ship’s service generators

    • 
    Two sources of power to equipment that is vital to the ship
    Two sources of power to equipment that is vital to the ship
  21. What is the advantage of using an MBT as an alternate power source to a vital load?



    • 
    The maintaining of 58% of the lighting circuits if one phase is lost

    • 
    Automatic switching of power supplies

    • 
    Circuit conditions can be met before energizing

    • 
    The load can be secured faster in an emergency
    The load can be secured faster in an emergency
  22. What is the function of the switchboard bus ties?



    • 
    To permit switchboards to be cross connected and to allow paralleling of generators

    • 
    To allow power distribution direct from the generator to the load

    • 
    To feed power to the dc generator

    • 
    To allow the generators to operate in series
    To permit switchboards to be cross connected and to allow paralleling of generators
  23. What is the closing sequence of the contacts in an ACB circuit breaker?



    • 
    Arcing contacts and the main contacts close together

    • 
    The main contacts close; then the arcing contacts close

    • 
    Main contacts close only

    • 
    Arcing contacts close; then the main contacts close
    Arcing contacts close; then the main contacts close
  24. When testing a grounded receptacle, what is the maximum acceptable resistance from the ground connection to the ship’s hull?



    • 
    1.05

    • 
    0.0001

    • 
    Less than 1

    • 
    1.0
    Less than 1
  25. What is the purpose of the disconnect links?



    • 
    They provide a convenient means of load testing ship’s service generators

    • 
    They are used to provide overcurrent protection to the main bus

    • 
    They provide a means of securing power to a switchboard during a fire

    • 
    They enable repairs to be conducted to one switchboard without affecting the operation of the whole system
    They enable repairs to be conducted to one switchboard without affecting the operation of the whole system

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