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Single Phase Motor - Single Phase Motor
  1. When a universal motor is operated on no load, its speed is limited by
    2. A.
    armature reaction
    B.
    armature weight
    C.
    windage and friction
    D.
    supply voltage frequency

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  2. As compared to other single phase ac motors a universal motor has
    3. 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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  3. When a motor speed of 5000 rpm is required, which motor will you select ?
    4. A.
    Capacitor start motor
    B.
    Shaded pole motor
    C.
    Hysteresis motor
    D.
    Universal motor

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

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

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  6. A motor suitable for signaling device is
    7. A.
    induction motor
    B.
    dc shunt motor
    C.
    dc series motor
    D.
    reluctance motors

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  7. Which of the following single phase motors will operate at high power factor ?
    8. A.
    shaded pole motor
    B.
    capacitor run motor
    C.
    split phase motor
    D.
    capacitor start motor

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  8. A universal motor operates on
    9. A.
    constant speed and varying load
    B.
    constant load and varying speed
    C.
    approximately constant speed and load
    D.
    synchronous speed with varying load

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  9. The direction of rotation of universal motor can be reversed by
    10. A.
    reversing the supply terminals
    B.
    switching over from ac to dc
    C.
    interchanging the brush leads
    D.
    any of the above

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  10. Single phase motors are commercially manufactured up to
    11. A.
    1H.P.
    B.
    2 H.P.
    C.
    5 H.P.
    D.
    10 H.P.

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