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Electrical Machines

Electrical Machines
When the rotor of a 3 phase induction motor is blocked then the slip is

 0.7.
  1.
  0.54.
 0.3.

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Electrical Machines
Iron losses in a DC machine are independent of variation in

 speed.
  speed and voltage.
  voltage.
  load.

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

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

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Electrical Machines
Eb/Vt ratio of a DC motor is an indication of

 starting torque.
 efficiency.
 speed regulation.
 running torque.

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Electrical Machines
What is the full form of MNP?

  Magnetic neutral pole.
  Magnetic field neutral plane.
  Magnetic field neutral pole.
  Magnetic neutral plane.

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Electrical Machines
A 3- phase synchronous motor can operate over a wide range of power factors i.e. from lagging to leading power factor. This is achieved by

 changing the field excitation.
 varying the speed.
 varying the applied voltage.
 changing the load.

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