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Electrical Machines

Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 230 V
 115 V
 460 V
 200 V

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Electrical Machines
The ___________________ generator has the poorest voltage regulation.

  differential compounded.
  under-compounded.
  over compounded.
  shunt.

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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

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

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Electrical Machines
The no load and full load speed of DC mototr are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor?

 15.30%.
 14.28%.
 18.25%.
  16.67%.

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Electrical Machines
Which of the following statements are correct ?

None of these
 A small value of leakage reactance will increase the maximum power output of motor.
 The leakage reactance of the induction motor should be small.
 Both 1 and 2.

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Electrical Machines
A DC 4 pole lap wound generator is running at 1000 rpm having 1200 conductors and flux density is 10 mwb. find the generated emf?

 100V
 10V
 20V
 200V

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