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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?

 20°
 30°
 60°
 18°

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Electrical Machines
Stray losses in transformer occurs in

 steel core.
 paper insulation in transformers.
 transformer insulating oil.
  winding conductors and steel structures of transformer.

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Electrical Machines
Field weakening control method is used for the _________ ?

 above rated speed
 below rated speed
 both A and B
None of these

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Electrical Machines
Compensating winding are used to rectify the flux density waveform at

 interpole region.
  region under main pole.
None of these
 throughout the air gap.

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Electrical Machines
Reluctance and hysteresis motors are the types of which electrical motor?

 3 - Φ induction motor.
  1 - Φ synchronous motor.
 Stepper motor.
 DC motor.

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Electrical Machines
The output indicate on the name plate of any motor is always the

 Power drawn in KW.
 Power drawn in KVA.
  Output power at the shaft.
 Gross power.

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