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Electrical Machines

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

 Synchronous machine
 DC machine
 Induction machine
All of these

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Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 decreases
 increases
 remains unaffected
 any of the above

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Electrical Machines
In a three phase slip-ring induction motor, brushes are connected to

  3 - Φ AC supply.
  equalizing coils.
  DC supply.
  external star-connected resistors.

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Electrical Machines
An induction motor has a rotor resistance of 0.002 Ω / phase. If the resistance is increased to 0.004 Ω / phase then the maximum torque will

 increase by 100%
 reduced to half
 increase by 200%
 remain unaltered

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Electrical Machines
which of the following losses are negligible in blocked rotor test?

 both A and B
 iron loss
 mechanical loss
 copper loss

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Electrical Machines
Ward Leonard control provides speed control

 in one direction only.
 below rated speed.
 above rated speed.
 in both direction.

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