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Electrical Machines

Electrical Machines
The no load current in a transformer lags the applied voltage by

  about 75°.
 90°.
 0°.
 about 115°.

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Electrical Machines
What does happen if tripled harmonics given to induction motor?

  Nothing will happen.
  Will results in short circuit.
  Fail to start.
  Will results in open circuit.

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Electrical Machines
Transformers operating in parallel will share the load depending upon their

 percentage impedance.
 efficiency.
 leakage reactance.
 rating.

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Electrical Machines
If we increase the rotor reactance value, the maximum torque will

 not changed
None of these
 increase
 decrease

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Electrical Machines
It is an advisable to use auto transformer if the transformation ratio is

 Greater than 1.
 0.25.
 near to 1.
 0.5.

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Electrical Machines
A 220 V dc machine has an armature resistance of 1Ω.If the full-load current is 20 A, the differenc in the induced voltages when the machine is running as a motor and as a generator is

 50 V
 20 V
 40 V
 zero

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