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Electrical Machines

Electrical Machines
When maximum starting torque is obtained, rotor power is

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Electrical Machines
A 4 pole lap wound dc generator has 4 brushes, if one of the brush is damaged, what will be the change in V, I and P ratings

 V, I/2 and P/2
 V/2, I and P/2
 V, I and P
 V/2, I/2 and P/4

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Electrical Machines
DC Shunt Motor has disadvantage(s) of

 constant speed.
 not suitable for rapidly changing loads.
 less expensive.
 none of above.

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Electrical Machines
In normal dc machines operating at full-load conditions, the most powerful electromagnet is

 armature winding
 field winding
 interpole and compensating windings together
 interpole winding

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Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

 Armature.
 Yoke.
  Commutator.
 Brush.

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Electrical Machines
What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A?

 10%
 21%
 11%
 41%

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