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Electrical Machines

Electrical Machines
The supply voltage to an induction motor is reduced by 10%. By what percentage, approximately, will the maximum torque decrease?

 5%
 40%
 19%
 10%

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

 shunt generator
 over compound generator
 both B and C
 series generators

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Electrical Machines
A three phase induction motor has a synchronous speed of 1500 rpm the machine runs at 1460 rpm at a particular load. The slip at this load is ___________.

 5 %.
  30 %.
  2.67 %.
 1.5 %.

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Electrical Machines
Satisfactory commutation of DC machine requires

 brushes should be of proper grade and size.
 brushes should smoothly run in the holders.
 smooth, concentric commutator properly undercut.
All of these

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Electrical Machines
Which of the following DC Motor requires 3 point starter?

  Shunt motor as well as compound motors.
  Series motor.
  Shunt, compound and series motor.
  Shunt motor.

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Electrical Machines
A 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be

 24.11 kW.
 26.21 kW.
 25 kW.
 23.06 kW.

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