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Electrical Machines

Electrical Machines
A 3-phase, 2 pole, 12 slot synchronous machine is operating at synchronous speed. Find the slot angle?

 30°
 20°
 60°
 18°

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Electrical Machines
The principal of starting of 3 - Φ IM is similar to

  capacitor run IM.
  repulsion motor type starting.
  synchronous motor.
  transformer with short-circuited secondary.

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Electrical Machines
Hunting in a synchronous cannot be due to

  variable frequency.
  variable load.
  variable supply voltage.
  windage friction.

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Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor

  Decreases.
 Increases.
 Remains unchanged.
 Oscillates around the rated speed.

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Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 -3.33%
 -3%
 +3.33%
 +3%

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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is

 100 KVA
 123.3 KVA
 83.33 KVA
 50 KVA

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