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Electrical Machines

Electrical Machines
At stand still condition the value of slip is

 finite value
 infinite value
 0
 1

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Electrical Machines
Regenerative braking is possible in

 DC series motor.
 DC shunt motor with armature resistance control.
  DC shunt motor with field weakening control.
 DC compound motor.

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors. Calculate the back emf produced when it is running at a speed of 1500 rpm.

  220 volt.
 230 volt.
 440 volt.
 240 volt.

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Electrical Machines
A single phase transformer when supplied from 220 V, 50 Hz has eddy current loss of 50 W. If the transformer is connected voltage of 330 V, 75 Hz, the eddy current loss will be

 112.5 W
 50 W
 75 W
 168.75 W

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Electrical Machines
Which of the following motor is suitable for frequent starting and stoppings?

 Capacitor start capacitor run motor
All of these
 Capacitor start motor
 Resistance split phase motor

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Electrical Machines
Which of the following load normally needs starting torque more than rated torque?

 Blowers.
 Centrifugal pumps.
  Conveyers.
 Air compressors.

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