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Electrical Machines

Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

 50Hz.
 150Hz.
 100Hz.
 200Hz.

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Electrical Machines
Which of the following load normally needs starting torque more than rated torque?

 Centrifugal pumps.
  Conveyers.
 Air compressors.
 Blowers.

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Electrical Machines
When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes

 1/2 of the initial value
 1/4 of the intial value
 twice the initial value
 4 time the initial value

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Electrical Machines
A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is

 5%
 4%
 2%
 25%

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Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

 Less than 50 %
 Any where between 75 % and 90 %.
 Around 100 %.
 Around 90 %

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

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

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MORE MCQ ON Electrical Machines

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