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Electrical Machines

Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 0.08
 -1.92
 -0.08
 1.92

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Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 any of the above
 remains unaffected
 decreases
 increases

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Electrical Machines
In diesel engine, gas engine type of machine contains ___________________ pole type of alternator.

  salient.
 none of these.
 cylindrical.
 non uniform cylindrical.

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Electrical Machines
The armature mmf in a dc machine is 1. stationary with respect to field poles 2. stationary with respect to armature 3. rotating with respect to field poles 4. rotating with respect to armature From these, the correct answer is

 2, 3
 2, 4
 1, 3
 1, 4

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Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is

  0.02 pu.
 0.16 pu.
  0.08 pu.
 0.01 pu.

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Electrical Machines
When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes

 1/2 of the initial value
 twice the initial value
 4 time the initial value
 1/4 of the intial value

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