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Electrical Machines

Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

None of these
 both of above.
 AC.
 DC.

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Electrical Machines
A 8-pole, DC generator has a simplex wave-wound armature containing 32 coils of 6 turns each. Its flux per pole is 0.06 Wb. The machine is running at 250 rpm. The induced armature voltage is

 96 V
 768 V
 384 V
 192 V

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Electrical Machines
Which of the following statements are correct ?

 The leakage reactance of the induction motor should be small.
None of these
 Both 1 and 2.
 A small value of leakage reactance will increase the maximum power output of motor.

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Electrical Machines
If input of a transformer is square wave the output will be

  pulsed wave.
 triangular wave.
 square wave.
 sine wave.

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 K×R1
 R1 /K²
 K²R1
 R1 /K

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Electrical Machines
In an alternator the voltage generated per phase is proportional to

  frequency of waveform.
All of these
  number of turns in coil.
  flux per pole.

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