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Electrical Machines

Electrical Machines
In DC machine torque depends on which of the following?

 flux (φ)
 speed
 armature current (I)
 both A and B

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Electrical Machines
Poles of DC machine are often laminated to

 reduce pulsation loss.
 reduce iron weight.
 dissipate more heat.
 reduce armature reaction.

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Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 0.08
 -1.92
 1.92
 -0.08

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Electrical Machines
In most condition which frame of motor will be preferred?

  Totally enclosed fan coiled.
 Splash proof.
 Drip proof.
 Open type.

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Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.2
 0.04
 0.02
 0.4

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

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

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