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Electrical Machines

Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 unity
 0.2 lead
 0.9 lag
 0.2 lag

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Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by

 using soft material for winding.
 increasing the number of turns.
 using the magnetic core of low reluctance.
 using transformer oil of better quality.

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Electrical Machines
It is advisable to start a DC series motor with some load to

 Avoid sparking.
 Limit the current.
 Limit the flux.
  Limit the speed.

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Electrical Machines
The noise resulting from vibrations of lamination set by magnetic forces, is termed as

 boo.
 magnetostriction.
 zoom.
  hum.

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Electrical Machines
Which of the following motor has more stability

 both motors has same stability
 cylindrical motor
None of these
 salient pole motor

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Electrical Machines
To increase starting torque of a 3-phase slip ring induction motor, preferred method is to increase

 supply voltage
None of these
 rotor resistance
 supply frequency

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