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Electrical Machines

Electrical Machines
Reactive power generated or delivered significantly depends on

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

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

 rotor resistance
 supply frequency
None of these
 supply voltage

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 R1 /K
 K×R1
 K²R1
 R1 /K²

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Electrical Machines
High starting torque and low starting current is the advantage of

  squirrel cage induction motor.
  stepper motor.
  slip ring induction motor.
  hysteresis motor.

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Electrical Machines
In DC shunt motor if load is increased, the speed

 increase proportional.
 reduce slightly.
 increased slightly.
 remains constant.

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Electrical Machines
If the field winding connection of DC shunt motor is changed

  It will run in opposite direction.
 motor will not run.
 It will run in same direction.
 motor will become slow.

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MORE MCQ ON Electrical Machines

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