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Electrical Machines

Electrical Machines
Hysteresis loop represents the area of

 total iron losses
 copper loss
 eddy current loss
 hysteresis loss

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Electrical Machines
The working principle of transformer depends on

 Faradays law of electromagnetic induction.
 Coulombs law.
 Amperes law.
 Newtons law.

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Electrical Machines
Which type of motors are used for lathes?

 DC shunt motors.
 Synchronous motor.
 Cage induction motor.
 Either A or B.

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Electrical Machines
Hunting in a synchronous cannot be due to

  variable frequency.
  variable load.
  variable supply voltage.
  windage friction.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 474 V
 6 V
 240 V
 234 V

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Electrical Machines
What is the shunt resistance component equivalent circuit obtained by no load test of an induction motor representative of ?

 Copper loss
 both 1 and 2
 core loss only
 windage and friction loss

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