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Electrical Machines

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

 36°
 18°
 72°
 30°

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Electrical Machines
The magnetic circuit of a dc shunt generator with negligible armature resistance and brush contact voltage drop remains unsaturated when it delivers full-load current at rated terminal voltage. The brushes are kept in the interpolar axis and speed is maintained constant. When the load is switched off, the terminal voltage would

 become zero
 increase
 remain the same
 decrease

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Electrical Machines
Autotransformer makes effective saving on copper and copper losses, when its transformation ratio is equal to

  very low
  approx to one.
  less than one.
  greater than one.

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Electrical Machines
Ratio of starting torque to full load torque is minimum in

  Differential compound motor.
  Shunt motor.
  Series motor.
  Cumulative compound motor.

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

 increase.
 decrease.
 either of these.
None of these

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Electrical Machines
Which of the following is the largest conversion device?

 DC machine
 Induction machine
All of these
 Synchronous machine

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