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Electrical Machines

Electrical Machines
Reactive power generated or delivered significantly depends on

 excitation.
 both 1 and 2.
 frequency.
 load angle.

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Electrical Machines
What are the starters used for starting of cage motors?

 Star-delta starter.
  All of these.
 Auto transformer starter.
 DOL starter.

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Electrical Machines
If the field circuit of a DC shunt motor is opened

 The speed of motor will be reduced.
  The motor will attain dangerously high speed.
 The armature current will reduce.
 DC Shunt Motor

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Electrical Machines
In a 3-phase induction motor, if the supply voltage and frequency are reduced by the same ratio, then slip at which maximum torque occurs is

 less and maximum torque decreases
 more and maximum torque remains constant
 less and maximum torque increases
 more and maximum torque decreases

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

None of these
 decrease
 increase
 not changed

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

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

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MORE MCQ ON Electrical Machines

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