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Electrical Machines

Electrical Machines
No load test of 3-phase induction motor gives which of the following?

None of these
 both A and B
 variable loss
 constant loss

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Electrical Machines
If an induction machine is run at above the synchronous speed it acts as

None of these
 an induction motor
 an induction generator
 a synchronous motor

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Electrical Machines
In escalator which motor is used?

  Universal motor.
  1 - φ IM.
  3 - φ IM.
  DC shunt motor.

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Electrical Machines
A self-excited shunt generator fails to build up, because 1. the field circuit is open 2. The armature circuit is open 3. the residual magnetism is absent 4. The direction of rotation is wrong From these, the correct answer is

 1, 2 and 3
 1, 2, 3 and 4
 3 only
 1, 3

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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

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

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Electrical Machines
The power developed by salient pole synchronous machine is/are

 both 1 and 2
None of these
 power due to saliency or reluctance only
 excitation power only

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