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Electrical Machines

Electrical Machines
The flux involved in the emf equation of a transformer has

  maximum value.
 average value.
 rms value.
 total value.

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Electrical Machines
A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 5.7 Ω
 2.2 Ω
 1.9 Ω
 6 Ω

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Electrical Machines
A 4-pole generator with 16 coil has a two layer lap winding. The pole pitch is

 32.
  4.
 8.
 16.

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Electrical Machines
The power factor of squirrel cage induction motor is

 both A and B
 low at heavy loads only
 low at light loads only
 low at rated load only

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Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is

 60
 660
 600
 40

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Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  linear.
  cage.
  none of these.
  wound.

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