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Electrical Machines

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

  wound.
  cage.
  linear.
  none of these.

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Electrical Machines
In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is

 2, 3, 4
 1, 3, 5
 1, 2, 5
 1, 2, 3, 4

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Electrical Machines
In synchronous generator V curve is drawn between

 field current on Y-axis and armature current on X-axis.
 either of these.
 field current on X-axis and power factor on Y-axis.
 field current on X-axis and armature current on Y-axis.

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Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

 3000W
 500W
 1000W
 100W

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Electrical Machines
Slip exists in

  in both machines.
  none of above.
  induction motor.
  synchronous motor.

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Electrical Machines
The back emf produced in a dc motor depends on

  P.
  Z.
  P and Z.
  none of these.

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