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Single Phase Induction Motors - section-1
  1. In a shaded pole motor, the shading coil usually consist of

    2. A.

     a single turn of heavy wire which is in parallel with running winding
    B.

     a single turn of heavy copper wire which is short-circuited and carries only induced current
    C.

     a multilayer fine gauge copper wire in parallel with running winding
    D.

     none of the above

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  2. The shaded pole motor is used for

    3. A.

     high starting torque
    B.

     low starting torque
    C.

     medium starting torque
    D.

     very high starting torque

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  3. When a D.C. series motor is connected to A.C. supply, the power factor will be low because of

    4. A.

     high inductance of field and armature circuits
    B.

     induced current in rotor due to variations of flux
    C.

     fine copper wire winding
    D.

     none of the above

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  4. The motor used on small lathes is usually

    5. A.

     universal motor
    B.

     D.C. shunt motor
    C.

     single-phase capacitor run motor
    D.

     3-phase synchronous motor

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  5. The speed of a universal motor is generally reduced by using

    6. A.

     gear trains
    B.

     V-belts
    C.

     brakes
    D.

     chains

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  6. The speed of a universal motor is usually reduced by using

    7. A.

     gearing
    B.

     belts
    C.

     brakes
    D.

     chains

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  7. The rotor developed by a single-phase motor at starting is

    8. A.

     more than rated torque
    B.

     rated torque
    C.

     less than the rated torque
    D.

     zero

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  8. Torque developed by a single phase induction motor at starting is

    9. A.

     pulsating
    B.

     uniform
    C.

     none of the above
    D.

     nil

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  9. Speed control of a universal motor is achieved by

    10. A.

     Varying field flux with tapped field windings
    B.

     Connecting rheostat in series
    C.

     Applying variable voltage by means of silicon controlled rectifier
    D.

     All of the above methods

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  10. Which of the following statements regarding two value capacitor motor is incorrect ?

    11. A.

     It is a reversing motor
    B.

     It is preferred to permanent-split single-value capacitor motor where frequent reversals are required
    C.

     It has low starting as well as rushing currents
    D.

     It has high starting torque

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