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Electrical Machines

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

 72°
 30°
 36°
 18°

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Electrical Machines
In a synchronous motor torque or load angle δ ------------- with increase in load

 remains unaffected
 decreases
None of these
 increases

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Electrical Machines
Wave winding is employed in DC machine of

  low current and high voltage rating.
 high current and low voltage rating.
 high current and low voltage rating.
 low current and low voltage rating.

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Electrical Machines
Compensating winding are used to rectify the flux density waveform at

None of these
 throughout the air gap.
 interpole region.
  region under main pole.

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.4
 0.02
 0.04
 0.2

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Electrical Machines
Which of the following motors are suitable for computer printer drive ?

 Shaded pole motor.
 Reluctance motor.
 Hysteresis motor.
  Stepper motor.

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