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Electrical Machines

Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 4 V
 0 V
 2 V
 1 V

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Electrical Machines
Regenerative braking is possible in

 DC series motor.
 DC shunt motor with armature resistance control.
 DC compound motor.
  DC shunt motor with field weakening control.

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Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

 Any where between 75 % and 90 %.
 Around 100 %.
 Less than 50 %
 Around 90 %

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Electrical Machines
Which of the following DC Motor is used in paper machines?

 Separately excited DC motor.
 DC compound motor.
 DC Shunt motor.
 DC series motor.

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Electrical Machines
The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in

  delta or star according to need.
None of these
  star.
  delta.

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

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

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