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Electrical Machines

Electrical Machines
An induction motor has synchronous speed of 1500 rpm. What will be the slip when it is running at a speed of 1450 rpm?

 +3%
 -3%
 +3.33%
 -3.33%

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Electrical Machines
If the temperature of armature resistance is increased, the speed of a series motor would

 increase.
 None of above.
 not change.
 decrease.

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Electrical Machines
The fall in speed of the DC generator due to increase in load can be corrected by

  increasing the input to the prime mover.
  reducing the load voltage.
 cooling the armature.
  increasing the excitation.

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Electrical Machines
Which of following winding is connected in series with armature winding of DC machine?

 Commutating pole winding.
 Both Compensating and Commutating pole winding.
 Compensating winding.
 Auxiliary winding.

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Electrical Machines
Compensating windings is placed in which part of a D.C motor?

 On yoke in the inter pole gap.
 On armature.
None of these
  On yoke in the pole faces.

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Electrical Machines
Swinburne test is conducted under which of the following condition?

 half load
 any of the above
 full load
 no load

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