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Electrical Machines

Electrical Machines
For pure resistive load what is the armature reaction?

All of these
 cross magnetization
 magnetization
 demagnetization

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Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  none of these.
  cage.
  wound.
  linear.

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Electrical Machines
A 3 - Φ induction motor draws an current of 50 A from mains when starts by direct switching. If an auto transformer with 60 % tapping is used for starting the current drawn from the mains will be

 36.
 80.
 50.
  18.

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Electrical Machines
A 3-phase slip ring induction motor is wound for 4 poles on stator and 6 poles on the rotor. When 3-phase balanced voltage source at 50 Hz is applied, it will run at

 750rpm
 1500 rpm
 zero speed
 1000 rpm

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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 ?

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

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Electrical Machines
Which of the DC Motor use flywheel?

 Differently compared motor.
 Shunt motor.
 Cumulatively compound motor.
 Series motor.

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