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Electrical Machines

Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  f / s.
  sf / 2.
  s2.
  sf.

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Electrical Machines
The no load and full load speed of DC motor are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor ?

 15.30%.
 18.25%.
 16.67%.
 14.28%.

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Electrical Machines
The reduced air gap results in an increase

  cost of operation.
  breaking torque.
  power factor.
  starting torque.

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Electrical Machines
Which type of bearing is provided in small induction motors to support the rotor shaft?

None of these
  Cast iron bearings.
  Ball bearings.
  Bush bearings.

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 normal speed.
 any of the above.
 synchronous speed.
 slip speed.

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 rotor of an synchronous machine.
 stator of a dc machine.
 rotor of a dc machine.
 stator of a induction machine.

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