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Electrical Machines

Electrical Machines
In a DC generator, if P be the number of poles and N be the rpm of the rotor, then frequency of magnetic reversals will be

 PN/3000.
 PN/2.
 PN/120.
 PN/60.

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Electrical Machines
In case of IM the torque is

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

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Electrical Machines
In electric locomotive which of the following motor are used ?

  DC series motor.
  Synchronous motor.
  Shunt motor.
  Separately compound motor.

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

  about 75°.
 0°.
 90°.
 about 115°.

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Electrical Machines
Which motor used in Lathe machine?

  D.C. cumulative compound motor.
None of these
  D.C . series motor.
  D.C. shunt motor.

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Electrical Machines
Which of the following motor is suitable for frequent starting and stoppings?

 Capacitor start motor
 Resistance split phase motor
 Capacitor start capacitor run motor
All of these

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