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Electrical Machines

Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 36 W.
 30 W.
 28 W.
 25 W.

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Electrical Machines
The overall power factor of an on load transformer

 is always unity.
  depends on the power factor of the load.
 is always leading.
 is always lagging.

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Electrical Machines
What is/are the necessary conditions for parallel operation of alternators?

 Speed of alternators should be same
 Frequency should be same
 Terminal voltage is same
 Both 1and 2

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Electrical Machines
Eddy current loss will depends on

 Frequency
All of these
 Flux density
 Thickness

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Electrical Machines
When applied rated voltage per phase is reduce to one half, the starting torque of three phase squirrel cage induction motor becomes

 twice the initial value
 4 time the initial value
 1/4 of the intial value
 1/2 of the initial value

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Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the

 motor field terminal.
 motor armature terminal.
 generator armature terminal.
 generator field terminal.

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