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Electrical Machines

Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 -0.08
 -1.92
 0.08
 1.92

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Electrical Machines
A synchronous motor is supplying a load at unity power factor. If the load on the motor is increased keeping its excitation and terminal voltage constant, the power factor

 will become leading
 will remain the same
 will become lagging
None of these

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Electrical Machines
In an alternator the voltage generated per phase is proportional to

  frequency of waveform.
All of these
  flux per pole.
  number of turns in coil.

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Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?

 BYR
All of these
 RBY
 BRY

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Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

 reduced by 10%
 increased by 20%
 reduced by 20%
 increased by 10%

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Electrical Machines
Rotating magnetic field is produced in an induction motor because of

None of these
  either stator winding or rotor winding.
  stator winding.
  rotor winding.

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