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EEE :: Single Phase Induction Motors

  1. Which of the following motor will have relatively higher power factor ?

  2. A.

     Capacitor run motor

    B.

     Shaded pole motor

    C.

     Capacitor start motor

    D.

     Split phase motor

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  3. In split-phase motor auxiliary winding is of

  4. A.

     thick wire placed at the bottom of the slots

    B.

     thick wire placed at the top of the slots

    C.

     thin wire placed at the top of the slots

    D.

     thin wire placed at the bottom of the slots

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  5. In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to

  6. A.

     improve power factor

    B.

     increase overload capacity

    C.

     reduce fluctuations in torque

    D.

     to improve torque

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  7. Which of the following single-phase induction motors is generally used in time phonographs?

  8. A.

     Resistance start

    B.

     Capacitor start capacitor run

    C.

     Shaded pole

    D.

     Universal

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  9. In a capacitor start motor, the phase displacement between starting and running winding can be nearly

  10. A.

     10°

    B.

     30°

    C.

     60°

    D.

     90°

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  11. After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on

  12. A.

     running winding

    B.

     rotor winding

    C.

     field winding

    D.

     compensating winding

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  13. The power factor of a single-phase induction motor is usually

  14. A.

     lagging

    B.

     always leading

    C.

     unity

    D.

     unity to 0.8 leading

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  15. Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a

  16. A.

     Magnetic relay

    B.

     Thermal relay

    C.

     Centrifugal switch

    D.

     None of the above

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  17. To reverse the direction of rotation of acapacitor start motor while it is running we should

  18. A.

     disconnect motor from the supply till it stops then reconnect it to supply with reversed connection of main or auxiliary winding

    B.

     disconnect motor from supply and immediately reconnect it to supply with reversed con-nections of the main winding

    C.

     reverse the direction of connection of the auxiliary winding and after motor comes to rest then connect auxiliary winding to the supply

    D.

     reverse the direction of connections of the auxiliary winding and immediately connect it to supply

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  19. A universal motor is one which

  20. A.

     can be operated either on D.C. or A.C. supply at approximately the same speed and output

    B.

     can be marketed internationally

    C.

     runs at dangerously high speed on no-load

    D.

     none of the above

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