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Electrical Machines

Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 50 Hz
 60 Hz
 40 HZ
 25 Hz

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Electrical Machines
Transformers operating in parallel will share the load depending upon their

 efficiency.
 percentage impedance.
 rating.
 leakage reactance.

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Electrical Machines
In DC machine shape of main field flux distribution is?

 saddle shape
 peaky in nature
 triangular
 flat tapped or trapezoidal

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Electrical Machines
If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field

  to a DC source.
 to earth.
 in reverse.
 to an AC source.

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Electrical Machines
Armature coil is short circuited by brushes when it lies

  along neutral axis.
  in any of above positions.
  along field axis.
  in none of above positions.

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Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

 1 and 2
 2 alone
 1, 2 and 3
 1 and 3

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