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Electrical Machines

Electrical Machines
For a dc machine shunt resistance and armature resistance values are

 low and high
 high and high
 high and low
 low and low

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Electrical Machines
In a transformer maximum flux density is not constant, the eddy current loss varies as

 V
 V²
 f
 f²

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Electrical Machines
The wound rotor type IM is used for____________ speed operation.

  maximum.
  minimum.
  variable.
  constant.

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Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 0.2 lead
 unity
 0.9 lag
 0.2 lag

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Electrical Machines
Voltage regulation can be determined by which of the following?

All of these
 ZPF method.
 Synchronous impedance method.
 MMf method.

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Electrical Machines
A three phase 400 V, 6 pole, 50 Hz, squirrel cage induction motor is running at a slip of 5%. The speed of stator magnetic field with respect to rotor magnetic field and speed of rotor w.r.t stator magnetic field are

 1000 rpm, - 50 rpm.
 1000 rpm, 950 rpm.
 zero, 950 rpm.
 zero , - 50 rpm.

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