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Electrical Machines

Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 -1.92
 1.92
 -0.08
 0.08

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Multiple voltage control.
 Field control.
 Armature control.
 Ward-Leonard control.

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Electrical Machines
The noise resulting from vibrations of lamination set by magnetic forces, is termed as

 zoom.
 boo.
  hum.
 magnetostriction.

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

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

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Electrical Machines
For a DC machine having P no of pair of pole pairs, Z no of conductors having length L of resistivity ρ and cross section S are arranged. what is the armature resistance?

 PZL/4Sa²
 PZL/ 4Sa
 PZL/4S
 PZL/4Sp²

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Electrical Machines
Air core transformer as compared to iron core transformer, has

  no magnetic core loss.
 more magnetic core loss.
 less magnetic core loss.
  more copper loss.

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