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Electrical Machines

Electrical Machines
Find the number of poles required, when the frequency is 50Hz and speed of the motor is 500 rpm?

 12
 10
 5
 24

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Electrical Machines
For the same power output rating and full load speed, the motor will have poorest starting torque, is

 Differential compound.
  Shunt.
 Series.
 Cummulative compound.

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Electrical Machines
Voltage regulation can be determined by which of the following?

 Synchronous impedance method.
All of these
 ZPF method.
 MMf method.

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

 1.92
 -0.08
 -1.92
 0.08

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Electrical Machines
A DC shunt generator builds up 230 V when driven in clockwise direction. In case it is driven in anti clockwise direction, other things remaining unchanged, then the voltage build up is

 not possible
 some what less than 230 V
 230 V
 some what more than 230 V

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Electrical Machines
Which of the following induction motor has the highest starting torque?

 Squirrel cage induction motor.
None of these
 Slip ring induction motor.
 Same in both induction motors.

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