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Electrical Machines

Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 30°
 36°
 18°
 72°

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Electrical Machines
In field flux method speed control of DC Motor is

 constant power drive above base speed.
 constant torque drive above the base speed.
 constant hp drive below the base speed.
 constant torque drive below the base speed.

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Electrical Machines
The stator frame in an induction motor is used to

  protect the whole machine.
  provide return path for the flux.
  ventilate the armature.
  hold armature stamping in position.

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Electrical Machines
In double cage induction motor, the inner cage offers

  low resistance and high reactance.
  high resistance and high reactance.
  high resistance and low reactance.
  low resistance and low reactance.

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Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 lagging
 zero
 leading
 unity

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Electrical Machines
A 3-phase 6 pole 50 Hz induction motor is running at 5% slip.What is the speed of the motor?

 1000 rpm
 900 rpm
 950 rpm
 850 rpm

ANSWER DOWNLOAD EXAMIANS APP
MORE MCQ ON Electrical Machines

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