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Electrical Machines

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

  minimum.
  constant.
  variable.
  maximum.

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

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Electrical Machines
Saving of copper in auto transformer is increased as compared to two winding transformer, when transformation ratio K approaches to

 zero.
 two.
 infinity.
  unity.

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Electrical Machines
What is power factor of a 3 - φ induction motor at no load?

  High.
  Equal to 1.
  Low.
  Same as full load.

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Electrical Machines
For 250 volt DC Shunt Motor the armature and field resistance are 0.5 ohm and 250 ohm respectively. What will be the back e.m.f. produced when it takes a load current of 21A.

 280 V.
 150 V.
 240 V.
 220 V.

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Electrical Machines
For the same power output rating and full load speed, the motor will have poorest starting torque, is

 Series.
 Differential compound.
  Shunt.
 Cummulative compound.

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