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Electrical Machines

Electrical Machines
If input of a transformer is square wave the output will be

 square wave.
 sine wave.
 triangular wave.
  pulsed wave.

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Electrical Machines
In case of a dc motor the ratio Eb / E is indicative of

  ratio of starting to running current.
  ratio of input to output voltage.
  ratio of starting to running torque.
  efficiency.

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

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

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Electrical Machines
DC series motor is best suited for electric traction as

 It runs at very high speed at light load.
 It consume less power.
  It develops high starting torque.
 It is cheaper in cost.

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Electrical Machines
In which of the following generators negative voltage regulation can occur?

 over compound generator
 both B and C
 shunt generator
 series generators

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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
 both 1 and 2
 Copper loss

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