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Electrical Machines

Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Zero
 S.Ns
 Nr
 Ns

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Electrical Machines
What does happen if tripled harmonics given to induction motor?

  Fail to start.
  Will results in open circuit.
  Nothing will happen.
  Will results in short circuit.

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Electrical Machines
Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque

 DC Series Motor
 Compound Wound DC Motor
 Separately Excited DC Motor
 DC Shunt Motor

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Electrical Machines
A 3 - Φ, 12 pole, 600 V, 50 Hz star connected IM has rotor resistance and stand still resistance of 0.03 Ω and 0.5 Ω respectively. The speed of maximum torque will be

  470 rpm.
 450 rpm.
 540 rpm.
  240 rpm.

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Electrical Machines
A DC shunt generator builds up 230 V when driven in clockwise direction. In case it is driven in anti clockwise direction, other things remaining unchanged, then the voltage build up is

 some what more than 230 V
 230 V
 not possible
 some what less than 230 V

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Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 50 Hz
 100 Hz
 25 Hz
 0 Hz

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MORE MCQ ON Electrical Machines

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