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Electrical Machines

Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 650 W
 625 W
 600 W
 700 W

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Electrical Machines
In DC machine shape of main field flux distribution is?

 saddle shape
 flat tapped or trapezoidal
 peaky in nature
 triangular

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Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is

 40
 60
 600
 660

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Electrical Machines
In which of the following generators negative voltage regulation can occur?

 both B and C
 series generators
 over compound generator
 shunt generator

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Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at

 leading power factor.
 any of the above.
 lagging power factor.
 unity power factor.

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Electrical Machines
Dynamic braking can be used for

 series motors.
 compound motors.
 shunt motors.
All of these

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