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Electrical Machines

Electrical Machines
Which type of motors are preferred in lifts?

None of these
 DC shunt motors.
 DC series motors.
 DC compound motors.

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Electrical Machines
If we increase the rotor reactance value, the maximum torque will

 decrease
 increase
 not changed
None of these

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

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

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Electrical Machines
Armature of DC machine is made of

 silicon steel.
 conducting material.
 non-ferrous material.
 insulating material.

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Electrical Machines
If an AC servomotor has one of its winding excited by AC, then voltage measured at the other winding with rotor running will be

 constant independent of speed.
 proportional to square of rotor speed.
 zero.
  proportional to rotor speed.

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Electrical Machines
When a synchronous motor is running at synchronous speed, the damper winding produces

 eddy current torque.
 both 1 and 2.
 no torque.
 damping torqe.

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MORE MCQ ON Electrical Machines

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