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Electrical Machines

Electrical Machines
The current drawn by a DC motor at the time of starting is

 Very high.
 Very low.
 Normal.
 Zero.

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Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 decreases
 any of the above
 increases
 remains unaffected

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Electrical Machines
An induction motor having 8 poles runs at 727.5 rpm. If the supply frequency is 50Hz, the emf in the rotor will have a frequency of

 2.5Hz
 51.5Hz
 1.5Hz
 48.5Hz

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Electrical Machines
In DC generators, the brushes remain in contact with conductors which

 lie in the inter polar gaps.
 lie under north pole.
 there is no hard and fast rule for this.
 lie under south pole.

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Electrical Machines
The use of double squirrel cage winding on the rotor provides

 higher efficiency.
  a large starting torque.
 low noise.
 reduced starting torque.

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Electrical Machines
Which of the following induction motor has the highest starting torque?

 Squirrel cage induction motor.
None of these
 Same in both induction motors.
 Slip ring induction motor.

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MORE MCQ ON Electrical Machines

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