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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?

 24
 5
 12
 10

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Electrical Machines
A single-winding single-phase motor has

  zero starting torque.
 starting torque equal to full-load torque.
 high starting torque.
 low starting torque.

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Electrical Machines
A 6 pole lap connected DC generator with 480 conductors has armature resistance of 0.06 Ω. If the conductors are reconnected to from a wave winding other things remaining unchanged, the value of armature resistance will be

  0.54 Ω.
 0.01 Ω.
 0.54 Ω.
 0.06 Ω.

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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

 -0.08
 0.08
 1.92
 -1.92

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Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

 0.87
 0.95
 1.06
 0.96

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Electrical Machines
Hysteresis loss is proportional to

  f.
 f3.
 f1.5.
 f2.

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