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Electrical Machines

Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 40%
 19%
 10%
 5%

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Electrical Machines
For larger units high torque it is preferred to use

 Partial motor.
 Slip induction motor.
 Universal motor.
 DC shunt motor.

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Electrical Machines
Maximum power developed in a cylindrical synchronous machine depends on

 excitation
 load angle
 synchronous reactance
 both 1and 2

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Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T∝ V²
 T ∝ V
 T ∝ 1/V²
 T ∝ 1/V

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Electrical Machines
If the excitation is increased, the power factor is

None of these
 leading power factor
 lagging power factor
 unity power factor

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Electrical Machines
Which of the following motor used in hair dryers?

  Split phase IM.
  Synchronous motors.
  Cage induction motor.
  Shaded pole IM.

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MORE MCQ ON Electrical Machines

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