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Synchronous Motors - section-1
Synchronous Motors - Section-2
  1. Synchronous motors are

    2. A.

     Not-self starting
    B.

     Self-starting
    C.

     Essentially self-starting
    D.

     None of the above

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  2. The standard full-load power factor ratings for synchronous motors are

    3. A.

     zero or 0.8 leading
    B.

     unity or 0.8 lagging
    C.

     unity or 0.8 leading
    D.

     unity or zero

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  3. If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then

    4. A.

     the stator current will be zero
    B.

     the stator current will be very small
    C.

     the stator current will be very high
    D.

     the back e.m.f. will be more than the supply voltage

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  4. The speed regulation of a synchronous motor is always

    5. A.

     1%
    B.

     0.5%
    C.

     positive
    D.

     zero

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  5. The construction of a synchronous motor resembles

    6. A.

     a series motor
    B.

     an induction motor
    C.

     an alternator
    D.

     a rotary converter

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  6. A three-phase synchronous motor will have

    7. A.

     no slip-rings
    B.

     one slip-ring
    C.

     two slip-rings
    D.

     three slip-rings

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  7. The operating speed of a synchronous motor can be changed to new fixed value by

    8. A.

     changing the load
    B.

     changing the supply voltage
    C.

     changing frequency
    D.

     using brakes

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  8. The minimum armature current of the synchronous motor corresponds to operation at

    9. A.

     zero power factor leading
    B.

     unity power factor
    C.

     0.707 power factor lagging
    D.

     0.707 power factor leading

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  9. If the field circuit of an unloaded salientpole synchronous motor gets suddenly open-circuited, then

    10. A.

     it runs at a slower speed
    B.

     the motor stops
    C.

     it continues to run at the same speed
    D.

     it runs at a very high speed

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  10. A synchronous motor can be started by

    11. A.

     pony motor
    B.

     D.C. compound motor
    C.

     providing damper winding
    D.

     any of the above

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