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Electrical Machines

Electrical Machines
The heat generated in the transformer is dissipated mainly by

 conduction.
  convection.
All of these
 radiation.

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Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 45°
 10°
 60°
 30°

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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will

 increase to rated voltage and then may decrease
 decrease
 remain nearly constant
 increase gradually and then stay at rated voltage

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Electrical Machines
The oscillation in a synchronous motor can be damped out by

  running the motor on leading power factors.
  oscillation cannot be damped.
  providing damper bars in the rotor pole faces.
  maintaining constant excitation.

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 10 volts.
 40 volts.
 20 volts.
 30 volts.

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Electrical Machines
Transformer oil is used as

 an insulator.
 a coolant.
 both A and B.
 inert medium.

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