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Electrical Machines

Electrical Machines
Which of the following will vary the maximum torque?

 rotor reactance X
 both 1 and 2
 rotor resistance R
None of these

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Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 1.1.
 20.
  0.905.
  0.05.

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Electrical Machines
A short-shunt cumulatively-compounded dc generator builds up a voltage of 220 V at no load at rated speed. If it is operated as a differentially compounded generator, other things remaining the same, it would build up

 somewhat less than 220 V
 220 V
 6 V
 more than 220 V

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Electrical Machines
If the field of a dc shunt motor gets opened while the motor is running, then the

 armature current will drop
 motor will attain dangerously high speed
 motor will become slow.
 armature will oscillate about original speed as the mean speed

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Electrical Machines
The condition for maximum running torque is

 0.707 lagging
 0.5 lagging
 unity
 zero
 R = S.X

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Electrical Machines
If the handle of a three point starter goes to back to OFF position, it may be due to

 all of these.
 high filed circuit resistance.
 over load.
 zero or very low voltage supply.

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