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EEE :: Single Phase Induction Motors

  1. A shaded pole motor can be used for

  2. A.

     toys

    B.

     hair dryers

    C.

     circulators

    D.

     any of the above

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  3. Hysteresis motor is particularly useful for high-quality record players and tape-recorders because

  4. A.

     it revolves synchronously

    B.

     it is not subject to any magnetic or mechanical vibrations

    C.

     it can be easily manufactured in extremely small sizes of up to 1 W output

    D.

     it develops hysteresis torque which is extremely steady both in amplitude and phase

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  5. The speed/load characteristics of a universal motor is same as that of

  6. A.

     D.C. motor

    B.

     D.C. shunt motor

    C.

     D.C. series motor

    D.

     none of the above

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  7. If the capacitor of a single-phase motor is short-circuited

  8. A.

     the motor will not start

    B.

     the motor will run

    C.

     the motor will run in reverse direction

    D.

     the motor will run in the same direction at reduced r.p.m.

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  9. The repulsion start induction run motor is used because of

  10. A.

     good power factor

    B.

     high efficiency

    C.

     minimum cost

    D.

     high starting torque

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  11. In split phase motor main winding is of

  12. A.

     thin wire placed at the top of the slots

    B.

     thin wire placed at the bottom of the slots

    C.

     thick wire placed at the bottom of the slots

    D.

     thick wire placed at the top of the? slots

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  13. Most of the fractional horsepower motors have either

  14. A.

     hard and annealed bearings

    B.

     ball or roller bearings

    C.

     soft and porous bearings

    D.

     plain or sleeve bearings

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  15. The motor used for the compressors is

  16. A.

     d.c. series motor

    B.

     shaded pole motor

    C.

     capacitor-start capacitor-run motor

    D.

     reluctance motor

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  17. If a particular application needs high speed and high starting torque, then which of the following motor will bepreferred ?

  18. A.

     Universal motor

    B.

     Shaded pole type motor

    C.

     Capacitor start motor

    D.

     Capacitor start and run motor

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  19. If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then

  20. A.

     motor will not come up to speed

    B.

     motor will not carry the load

    C.

     current drawn by the motor will be excessively high

    D.

     electrolytic capacitor will, in all probability, suffer break down

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