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Electrical Machines

Electrical Machines
Reactive power generated or delivered significantly depends on

 excitation.
 load angle.
 frequency.
 both 1 and 2.

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Electrical Machines
Which of the following methods of speed control is not affected through stator side?

  Change of supply frequency.
  Change of rotor resistance.
  Change of number of pole.
  Change of supply voltage.

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Electrical Machines
An 8 pole DC generator has 500 armature conductors and useful flux per pole of 0.065 Wb. What will be the emf generated if it is lap connected and runs at 1000 rpm. What must be the speed at which it is driven to produce the same emf if it is wave wound?

 541.67V, 200 rpm.
 2166.67V, 230 rpm.
 2166.67V, 270 rpm.
 541.67V, 250 rpm.

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Electrical Machines
In case of IM the torque is

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

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Electrical Machines
If the flux of DC motor approaches zero, its speed will

 between zero and infinity.
 remain unchanged.
 aprroach infinity.
 approach zero.

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Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 -3.33%
 +3%
 -3%
 +3.33%

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