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Electrical Machines

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

 18°
 72°
 36°
 30°

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Electrical Machines
Two transformers operating in parallel will share the load depending on their

 per unit impedance
 leakage reactance
 ratings
 efficiency

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Electrical Machines
What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field?

 Zero
None of these
 Slip speed
 Synchronous speed

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Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 200 V
 230 V
 460 V
 115 V

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Electrical Machines
A DC series motor has which of the following characteristics?

 Has a almost constant speed.
 Has its field winding consinting of thick wire and less no of turns.
 Has a poor torque.
 Can be started easily without load.

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Electrical Machines
Secondary winding of an auto transformer is also called

 compensating winding.
  common winding.
 tertiary winding.
 damping winding.

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