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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
 700 W
 600 W

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Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

 2 alone
 1 and 2
 1 and 3
 1, 2 and 3

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Electrical Machines
Armature resistance control method is used for the _______ ?

 above rated speed
 below rated speed
 both 1 and 2
None of these

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Electrical Machines
Oil is provided in an oil filled transformer for

 lubrication.
  insulating.
  both cooling and insulation.
 cooling.

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Electrical Machines
In DC generators, the brushes remain in contact with conductors which

 there is no hard and fast rule for this.
 lie under south pole.
 lie in the inter polar gaps.
 lie under north pole.

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Electrical Machines
A smaller air gap in a induction motor helps to

 reduce the chance of cogging.
 reduce the chance of crawling.
 reduce the magnetizing current.
 increase the starting torque.

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