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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%
 +3.33%
 +3%
 -3.33%

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Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 co- sinusoidal
 rectangular
 flat-topped
 sinusoidal

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Electrical Machines
What happens if fifth multiples of harmonics is given to induction motor?

  Either short circuit or open circuit occurs.
  It will rotates in reverse direction.
  It will rotates in normal operation.
  Fail to start.

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

 no load
 any of the above
 half load
 full load

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Electrical Machines
Eddy current loss will depends on

 Flux density
 Thickness
All of these
 Frequency

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Electrical Machines
The power developed by salient pole synchronous machine is/are

None of these
 excitation power only
 both 1 and 2
 power due to saliency or reluctance only

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