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Electrical Machines

Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 50 Hz
 40 HZ
 60 Hz
 25 Hz

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Electrical Machines
In case of a compensated DC series motor, the compensating winding is provided

 As a separate unit.
 In parallel with the field winding.
 In parallel with the armature winding.
  In series with the armature winding.

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Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

 50Hz.
 150Hz.
 200Hz.
 100Hz.

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Electrical Machines
The rotor electromotive force of the IM is observed to make 100 complete alterations per minute, calculated slip

 3 %.
None of these
  3.33 %.
 0 .001 %.

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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

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

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

 0 V
 4 V
 2 V
 1 V

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