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Electrical Machines

Electrical Machines
The output power of a dc motor is given by

  EbIa.
  none of these.
  EIa.
  EbIa2.

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Electrical Machines
In case of IM the torque is

  inversely proportional to slip.
  inversely proportional to √slip.
  directly proportional to slip2.
  directly proportional to slip.

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Electrical Machines
The inertia constant H of a synchronous condenser is

 equal to that of the effective length of the line.
 greater than that of turbo alternator.
  none of these.
 greater than that of hydro generator.

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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 ?

 14.28%.
 15.30%.
 18.25%.
 16.67%.

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Electrical Machines
The direction of rotation of a 3 - Φ induction motor can be reversed by

  transposing all the three leads from the supply.
  disconnecting any one phase.
  transposing any two leads from supply.
  transposing any two leads from slip rings.

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

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