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Electrical Machines

Electrical Machines
In single phase rotary converter the number of slip rings will be

 three.
 four.
 six.
 two.

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Electrical Machines
The magnetic circuit of a dc shunt generator with negligible armature resistance and brush contact voltage drop remains unsaturated when it delivers full-load current at rated terminal voltage. The brushes are kept in the interpolar axis and speed is maintained constant. When the load is switched off, the terminal voltage would

 increase
 remain the same
 decrease
 become zero

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Electrical Machines
A simple method of increasing the voltage of a DC generator is to

 increase the number of turns in field coil.
  increase the speed of shaft rotation.
 increase the source frequency.
 increase the number of turns in armature coil.

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Electrical Machines
Eddy current loss will depends on

All of these
 Frequency
 Flux density
 Thickness

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Electrical Machines
Inter pole winding is connected in-------------------------- ?

 series with armature
 series with main poles
 parallel with armature
 parallel with main poles

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Electrical Machines
The main disadvantage(s) of the ward-Leonard system is/are

 poor overall efficiency.
 all of above.
 high initial cost.
 high maintenance cost.

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MORE MCQ ON Electrical Machines

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