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Electrical Machines

Electrical Machines
The armature resistance of the dc motor is generally of the range

 50 ohm.
 100 ohm.
  0.1 ohm.
  0.5 ohm.

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Electrical Machines
The breakdown torque of a synchronous motor varies as

 1/V²
 V²
 1/V
 applied voltage V

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Electrical Machines
To have sparkless commutation, the armature reaction effect in a DC machine is neutralized by

 increasing field excitation.
  compensating winding and commutating poles.
 shifting the brush axis from GNA to MNA.
 fixing the brush axis inline with the pole axis.

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Electrical Machines
A 100 KVA transformer is operating at 60 Hz, 240 V supply. The same transformer is operating at 50 Hz, 200 V supply. The new rating is

 83.33 KVA
 123.3 KVA
 100 KVA
 50 KVA

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Electrical Machines
The slip of an induction motor during DC rheostatic braking is

 1 - s.
  s.
 2 + s.
  2 - s.

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Electrical Machines
Dynamic braking is very effective for

 separately excited motors.
 differential compound motors.
 series motors.
 shunt motors.

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MORE MCQ ON Electrical Machines

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