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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
What is the necessity of copper brushes in a dc motors?

  None of these.
  To increase the flux cutting by the rotor.
  To absorb the mechanical shocks produced during running condition.
  To convert alternating supply current to direct current.

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Electrical Machines
Which 1 - Φ motor does operate at high power factor?

  Capacitor start.
  Split phase.
  Capacitor run.
  Shaded pole.

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Electrical Machines
In a loaded DC motor, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 improve and the speed rises.
 deteriorate and the speed falls.
 deteriorate and the speed rises.
 improve and the speed falls.

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Electrical Machines
A DC series motor has which of the following characteristics?

 Has a poor torque.
 Has its field winding consinting of thick wire and less no of turns.
 Can be started easily without load.
 Has a almost constant speed.

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Electrical Machines
In a transformer which of the following losses are zero?

 Copper loss
All of these
 Iron loss
 Rotational loss

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