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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

  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

  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

  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

  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

  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

  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

  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

  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

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