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EEE :: Single Phase Motor

  1. The capacitance of a small single phase motor will be of the order of
  2. A.
    Kilo farads
    B.
    Few hundred farads
    C.
    Farads
    D.
    Micro or pico farads

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  3. In case of split phase motors the phase shift is usually limited to
  4. A.
    3 degrees
    B.
    60 degrees
    C.
    90 degrees
    D.
    150 degrees

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  5. For ceiling fans generally the single phase motor used is
  6. A.
    split phase type
    B.
    capacitor start type
    C.
    capacitor start and run type
    D.
    permanent capacitor type

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  7. In portable tools the speed of the driven shaft is reduced by
  8. A.
    Gearing
    B.
    Belt drive
    C.
    Chain drive
    D.
    Fluid coupling

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  9. Which of the following applications make use of a universal motor ?
  10. A.
    Floor polishing machine
    B.
    Oil expeller
    C.
    Portable tools
    D.
    Lathe machines

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  11. When a universal motor is operated on no load, its speed is limited by
  12. A.
    armature reaction
    B.
    armature weight
    C.
    windage and friction
    D.
    supply voltage frequency

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  13. As compared to other single phase ac motors a universal motor has
  14. A.
    speed ratio of 2: 1 on ac/dc
    B.
    highest efficiency on 50 Hz supply
    C.
    high horse power/kg ratio
    D.
    all of the above

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  15. When a motor speed of 5000 rpm is required, which motor will you select ?
  16. A.
    Capacitor start motor
    B.
    Shaded pole motor
    C.
    Hysteresis motor
    D.
    Universal motor

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  17. The motor used for driving the record player deck is
  18. A.
    dc series motor
    B.
    synchronous motor
    C.
    hysteresis motor
    D.
    dc shunt motor

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  19. Which capacitor is preferred in case of single phase motor
  20. A.
    Paper capacitor
    B.
    Ceramic capacitor
    C.
    Mica capacitor
    D.
    Electrolytic capacitor

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