ELECTRICIAN`S MATE Quiz 12

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ELECTRICIAN`S MATE Quiz 12
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2013-08-31 23:29:40
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ELECTRICIAN`S MATE Quiz 12
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ELECTRICIAN`S MATE Quiz 12
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  1. What action should you take to prevent a small boat motor from overheating?



    • 
    Operate the starting motor for a maximum of 2-minute periods at 30- second intervals

    • 
    Intermittently operate the starting motor for about 2 minutes, and, if the engine fails to start, allow the motor to cool before trying again

    • 
    Operate the starting motor for 30-second periods at 2-minute intervals

    • 
    Continue the operation of the starting motor after the drive pinion engages the flywheel
    Operate the starting motor for 30-second periods at 2-minute intervals
  2. The oil pressure safety switch is designed to secure the refrigeration compressor if the oil pressure drops to what minimum value?



    • 
    18 psi

    • 
    22 psi

    • 
    24 psi

    • 
    12 psi
    12 psi
  3. The output of the battery charger is determined by what component(s)?



    • 
    Switch S2 

    • 
    Resistor R4

    • 
    Switch S3

    • 
    The SCRs
    Switch S2
  4. What compressor component operates to allow the flow of the injection water?



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    Control relay 1CR

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    Servo valve SV1 

    • 
    Pressure switch PS1

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    Timing relay 6TR
    Servo valve SV1
  5. What is the purpose of the elapsed time meter?



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    To prevent equipment from being overused between overhauls

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    To keep track of the time a compressor is operated

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    To operate timed contacts at precise set points

    • 
    To allow operators to set the equipment to start and stop automatically
    To keep track of the time a compressor is operated
  6. What are the three major components of a window wiper?



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    Control box, drive unit, and wiper arm

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    Control box, rectifier unit, and drive unit

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    Load monitor, drive unit, and wiper arm

    • 
    Drive unit, load monitor, and wiper arm
    Control box, drive unit, and wiper arm
  7. What is the purpose of timing relay TR?



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    It closes after a 10-second time delay to de-energize the compressor if water pressure has not caused water pressure switch W to close its contacts

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    It prevents short circuiting the compressor motor by inserting a time delay on start up

    • 
    It inserts a 10-second time delay between the time the compressor is energized and suction pressure switch SP becomes active

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    It opens after a 10-second time delay to de-energize the compressor if oil pressure has not caused oil pressure switch OP to close its contacts
    It opens after a 10-second time delay to de-energize the compressor if oil pressure has not caused oil pressure switch OP to close its contacts
  8. The tank of the ultrasonic cleaner has what total number of sections?



    • 
    One

    • 
    Three

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    Four

    • 
    Two
    Two
  9. What feature de-ices the window served by the wiper?



    • 
    A 36-watt heating element in the wiper arm 

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    The friction of the blades on the window

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    Heaters placed on the bulkhead next to the window

    • 
    A wire-wound resistor placed in the control box
    A 36-watt heating element in the wiper arm
  10. When operating in the automatic 125 setting, the compressor is set to (a) start and (b) stop at what pressure?



    • 
    (a) 110 psig falling (b) 125 psig rising

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    (a) 105 psig rising (b) 120 falling

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    (a) 110 psig rising (b) 125 psig falling

    • 
    (a) 105 psig falling (b) 120 psig rising
    (a) 110 psig falling (b) 125 psig rising
  11. What compressor component operates to drain the dehydrator condensate sump?



    • 
    Solenoid valve SV7 

    • 
    Control relay 16CR

    • 
    Timing relay 3TR

    • 
    Selector switch 1SEL
    Solenoid valve SV7
  12. What is the purpose of the heater in the control circuit?



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    To prevent condensation from forming in the compressor motor windings

    • 
    To keep the ambient temperature above freezing to prevent sluggish operation of the compressor

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    To keep the oil of the compressor warm

    • 
    To keep the control circuitry from freezing
    To keep the oil of the compressor warm
  13. The suction pressure switch SP is set to (a) open and (b) close at what pressure?



    • 
    (a) 5 in.Hg (b) 5 psig

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    (a) 5 in.Hg (b) 8 psig 

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    (a) 8 in.Hg (b) 8 psig

    • 
    (a) 8 in.Hg (b) 5 psig
    (a) 5 in.Hg (b) 8 psig
  14. The low pressure air compressor has what total number of modes of operation?



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    Two auto (low and high) and one manual 

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    Two manual (low and high) and two auto (low and high)

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    One auto and two manual (low and high)

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    One manual and three auto (low, medium, and high)
    Two auto (low and high) and one manual
  15. What is the ratio of the speed of the starting motor to that of the engine?



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    150 to 1

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    15 to 1

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    2 to 1

    • 
    1 to 1
    15 to 1
  16. On a starting motor, what causes the pull-in coil to de-energize once the solenoid switch is closed?



    • 
    The holding coil closes auxiliary contacts in the start circuit

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    The pull-in coil is shorted by the plunger disk closing the start contacts

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    The start motor terminals are opened, shorting the pull-in coil 

    • 
    The solenoid plunger opens the coil contacts
    The start motor terminals are opened, shorting the pull-in coil
  17. What component compensates for temperature changes?



    • 
    Control coil L1

    • 
    Resistor R4

    • 
    Zener diode CR13

    • 
    Resistor R5
    Resistor R5
  18. What component acts to delay compressor shutdown for 10 minutes once a discharge pressure of 125 psig is reached?



    • 
    Selector switch 1SEL

    • 
    Pressure switch PS1

    • 
    Timing relay 1TR 

    • 
    Undervoltage relay UV
    Timing relay 1TR
  19. What voltage is used to operate the components of the control circuit?



    • 
    120 Vac

    • 
    110 Vac

    • 
    28 Vac

    • 
    440 Vac
    120 Vac
  20. On a refrigeration system, timing relays provide what safety feature?



    • 
    Secure the refrigeration after 10 seconds if no oil pressure develops

    • 
    Secure the controller if there is a loss of voltage

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    Prevent the unit from operating if there is no water

    • 
    Prevent overloading the refrigeration compressor
    Secure the refrigeration after 10 seconds if no oil pressure develops
  21. What type of controller is used on the airconditioning system?



    • 
    LVCR

    • 
    LVRE

    • 
    LVR

    • 
    LVP
    LVP
  22. Freeze storerooms and chill storerooms are maintained at what temperature, respectively?



    • 
    0°F and 33°F

    • 
    0°C and 33°C

    • 
    32°F and 40°F

    • 
    33°F and 0°F
    0°F and 33°F
  23. You have spilled battery acid on your arm. What is the first step you should take?



    • 
    Cover the area with boric acid powder

    • 
    Spread a thin coating of petroleum jelly over the area

    • 
    Sprinkle baking soda on the area

    • 
    Wash the area thoroughly with fresh water
    Wash the area thoroughly with fresh water
  24. What voltage is used to operate the wiper motor?



    • 
    68 to 115 Vdc

    • 
    115 Vac

    • 
    220 Vdc

    • 
    440 Vac
    68 to 115 Vdc
  25. On an air compressor, what condition is indicated by the enable running light?



    • 
    The compressor is in the automatic mode

    • 
    The compressor is in an operative condition 

    • 
    The dew point is at a safe level

    • 
    Power is available to the compressor
    The compressor is in an operative condition

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