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Electrical Machines

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

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Electrical Machines
In synchronous motor, the damper winding is generally used to

  reduce noise level only.
  prevent hunting and provide the starting torque.
  reduce the eddy currents.
  provide starting torque only.

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

  hum.
 magnetostriction.
 boo.
 zoom.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 234 V
 240 V
 6 V
 474 V

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Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 2000 rpm
 500 rpm
 1000 rpm
 250 rpm

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Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

 plugging.
 locking.
 cogging.
 crawling.

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