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Electrical Machines

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

 about 115°.
 90°.
 0°.
  about 75°.

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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

  increased.
 kept constant to certain value.
 remains same.
 decreased.

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Electrical Machines
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when

  the generator runs on designed speed.
  there is no load on the generator.
  the generator runs on overload.
  the generator runs on full load.

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Electrical Machines
A motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m2. Calculate the force experienced by the conductor, when the armature current is 5 Amp?

  None of these.
 20 N.
  Can't be determined.
  15 N.

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Electrical Machines
In travelling cranes for crane travel, trolley and boom hoist which motor is preferred?

  DC differential compound motor.
  Synchronous motor.
  Stepper motor.
  Slip ring induction motor.

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Electrical Machines
Which of the following will vary the maximum torque?

 both 1 and 2
None of these
 rotor reactance X
 rotor resistance R

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