Achr131 Module Final Review

50 Questions | Total Attempts: 773

SettingsSettingsSettings
Achievement Quizzes & Trivia

Possible Multiple Choice Questions


Questions and Answers
  • 1. 
    A split-phase has a _____ winding and a _____winding.
    • A. 

      Start, run

    • B. 

      Start, common

    • C. 

      Common, run

    • D. 

      Run, common

  • 2. 
    A split-phase motor can use a _____to energize and de-energize the start winding.
    • A. 

      Potential relay

    • B. 

      Current relay

    • C. 

      Centrifugal switch

    • D. 

      All of the above

  • 3. 
    A current magnetic relay opens and closes its contacts based on the _____.
    • A. 

      Current in the start winding

    • B. 

      Voltage across the start winding

    • C. 

      Voltage across the run winding

    • D. 

      Current in the run winding

  • 4. 
    A permanent split capacitor (PSC) motor that is running and up to speed will have the start winding _____ .
    • A. 

      Energized

    • B. 

      De-energized

    • C. 

      In series with the run winding

    • D. 

      Removed from the circuit

  • 5. 
    A split-phase motor that has a current relay and a start capacitor is called a _____motor.
    • A. 

      Capacitor Start, Capacitor Run (CSCR)

    • B. 

      Capacitor Start, Induction Run (CSIR)

    • C. 

      Induction Start, Induction Run (ISIR)

    • D. 

      Permanent Split Capacitor (PSC)

  • 6. 
    When a Capacitor Start, Capacitor Run (CSCR) motor initially starts, what is the total capacitance acting on the motor?  (Assume the run capacitor is 5 microfarads and the start capacitor is 20 microfarads.)
    • A. 

      5 microfarads

    • B. 

      4 microfarads

    • C. 

      20 microfarads

    • D. 

      25 microfarads

  • 7. 
    When a Capacitor Start Induction Run (CSIR) motor is running and up to speed, what is the total capacitance acting on the motor?  (Assume the run capacitor is 5 microfarads and the start capacitor is 20 microfarads.)
    • A. 

      4 microfarads

    • B. 

      5 microfarads

    • C. 

      20 microfarads

    • D. 

      25 microfarads

  • 8. 
    The starting device usually used on single phase, fractional horsepower compressor motors is the _____.
    • A. 

      Potential relay

    • B. 

      Current relay

    • C. 

      Centrifugal switch

    • D. 

      None of the above

  • 9. 
    A motor's speed is determined by _____.
    • A. 

      Size

    • B. 

      Voltage

    • C. 

      Amperage

    • D. 

      Number of motor poles

  • 10. 
    Start windings are placed _____the run windings.
    • A. 

      Outside

    • B. 

      Inside

    • C. 

      Between

    • D. 

      In series with

  • 11. 
    The start windings have _____.
    • A. 

      Fewer turns than the run windings

    • B. 

      More turns than the run windings

    • C. 

      The same number of turns as the run windings

    • D. 

      Larger diameter wire than the run windings

  • 12. 
    When a general duty split-phase motor reaches approximately 75% of its operating speed, the start winding is de-energized by a _____.
    • A. 

      Circuit board

    • B. 

      Capacitor

    • C. 

      Centrifugal switch

    • D. 

      Dual voltage switch

  • 13. 
    Capacitors wired in series with the starting winding provide _____.
    • A. 

      Longer starting time

    • B. 

      Greater starting torque

    • C. 

      An aid in starting three phase motors

    • D. 

      More efficient operation at full load speed

  • 14. 
    The shaded pole motor _____.
    • A. 

      Has little starting torque

    • B. 

      Has excessive starting torque

    • C. 

      Has greater efficiency than most split-phase motors

    • D. 

      Will start against a heavy starting load

  • 15. 
    Three phase motors have _____.
    • A. 

      Three start and three run windings for each phase

    • B. 

      One start and one run winding for each phase

    • C. 

      Run windings only

    • D. 

      A start switch in each phase circuit

  • 16. 
    The positive-temperature-coefficient start device is a type of _____.
    • A. 

      Capacitor

    • B. 

      Thermistor

    • C. 

      Switching device

    • D. 

      Diode

  • 17. 
    A permanent split-capacitor motor has a _____.
    • A. 

      Start and run capacitor

    • B. 

      Start capacitor only

    • C. 

      Run capacitor only

    • D. 

      Split phase capacitor

  • 18. 
    When referring to motors, to what does the "insulation class" relate?
    • A. 

      The noise level of the motor

    • B. 

      The type of base on which the motor is mounted

    • C. 

      The normal operating temperature of the motor

    • D. 

      Both a and b

  • 19. 
    Why are explosion-proof motors not normally used on standard equipment?
    • A. 

      They are too large.

    • B. 

      They are too noisy.

    • C. 

      They are too expensive.

    • D. 

      They cannot be replaced.

  • 20. 
    The motor that should be used in a potentially wet area is a(n) _____motor.
    • A. 

      Enclosed

    • B. 

      Drip proof

    • C. 

      Explosion proof

    • D. 

      Open

  • 21. 
    Which of the following voltages are not safe for a 208-V motor to operate?
    • A. 

      170 volts

    • B. 

      220 volts

    • C. 

      238 volts

    • D. 

      Both a and c

  • 22. 
    A sleeve bearing would typically be used in a motor that operates with a _____.
    • A. 

      Light load and where noise is a factor

    • B. 

      Heavy load and where noise is a factor

    • C. 

      Heavy load in a dirty atmosphere

    • D. 

      Heavy load in a moist atmosphere

  • 23. 
    If the voltage supplied to the motor is well below the motor rated voltage, the current draw will be _____it should be.
    • A. 

      Lower than

    • B. 

      The same as

    • C. 

      Higher than

    • D. 

      In reverse polarity than

  • 24. 
    The voltage tolerance of a standard electric motor is _____.
    • A. 

      +10% -5%

    • B. 

      +5% -10%

    • C. 

      +10% -10%

    • D. 

      +15% -15%

  • 25. 
    The locked-rotor amperage is normally _____times as great as the run-load amperage.
    • A. 

      Two

    • B. 

      Three

    • C. 

      Five

    • D. 

      Ten

Back to Top Back to top