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Electrical Machines

Electrical Machines
In a resistance split phase motor, what is the range of torque angle?

 70° to 85°
 90°
 25° to 30°
 0°

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Electrical Machines
If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?

  It will be doubled.
  It will becomes four times.
 It will remain the same.
  It will be halved.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 240 V
 474 V
 234 V
 6 V

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

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

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Electrical Machines
Swinburne's test is applicable to

 DC shunt and level Compound motor.
 DC compound motor.
 DC series motor.
 DC Shunt motor.

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Electrical Machines
At stand still condition the value of slip is

 1
 finite value
 0
 infinite value

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