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Electrical Machines

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

 18°
 36°
 72°
 30°

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

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

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Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 less than 90o.
 90o.
 0o.
 Greater than 90o.

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Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?

 4
 6
 1
 2

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Ward-Leonard control.
 Field control.
 Armature control.
 Multiple voltage control.

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Electrical Machines
In which transformer, the tertiary winding is used?

 Star - delta
 Star - star
 Delta - star
 Delta - delta

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