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Electrical Machines

Electrical Machines
In case of induction motors the ratio of length to pole pitch for minimum cost, is taken as

 1.0.
 2 to 3.
  1.5 to 2.
 3 to 5.

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Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 1
 50
 10
 100

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Electrical Machines
In auto transformer if the turn ratio is K, what is the power transferred inductively?

None of these
 both A and B
 K × input power
 (1-K) × input power

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Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 36°
 18°
 72°
 30°

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Electrical Machines
As compared to DOL starting, a cage induction motor with star-delta starting shall have

 more starting torque.
 smoother acceleration.
 reduced starting current.
 more starting time.

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Electrical Machines
Regenerative braking is possible in

 DC compound motor.
 DC series motor.
 DC shunt motor with armature resistance control.
  DC shunt motor with field weakening control.

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