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Electrical Machines

Electrical Machines
Induction motors have the advantage of

  less maintenance.
  less cost.
  all of below.
  simple in construction.

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Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

 4.
 6.
  8.
  2.

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Electrical Machines
Under which of the following conditions hunting of synchronous motor is likely to occur ?

  Small and constant load.
  Periodic variation of load.
  Over-excitation.
  Over-loading for long period.

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Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then

  I1 = KI2 + Iw + Iμ.ok
 I1 = KI2.
 I1 = KI2 + Iμ.
 I1 = KI2 + Iw.

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Electrical Machines
A series motor is efficiently suitable for

  high starting torque operation.
 constant speed operation.
 none of these.
 low starting torque operation.

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Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  constant.
  variable.
  maximum.
  minimum.

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MORE MCQ ON Electrical Machines

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