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Electrical Machines

Electrical Machines
Hysteresis loop represents the area of

 copper loss
 total iron losses
 hysteresis loss
 eddy current loss

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Electrical Machines
Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause

  less heating of the rotor.
  less heating of the rotor.
  all of these.
  negative sequence current.

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Electrical Machines
If the mechanical angle α between the stator and rotor poles increases, then the stator current

 Decreases.
  Increases.
 None of above.
 Remains unchanged.

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Electrical Machines
A 2 pole synchronous machine is operating at 3000 rpm. Find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm) ?

 ωe = ωm
 ωe = 2*ωm
 ωe = 4*ωm
 ωe = 1/2*ωm

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Electrical Machines
When maximum starting torque is obtained, rotor power is

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Electrical Machines
If the number of rotor slots is equal to number of stator slots, then motor refuses to start. Hence it is known as

  air gap.
  cogging.
  crawling.
  relative speed.

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MORE MCQ ON Electrical Machines

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