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Electrical Machines

Electrical Machines
The back emf produced in a dc motor depends on

  P.
  P and Z.
  Z.
  none of these.

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Electrical Machines
In shunt dc motor the direction of rotation of the motor will reversed. When

  either field terminals are reversed or armature terminals are reversed.
  none of above.
  only field terminals are changed.
  only armature terminals are reversed.

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Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 750 rpm
 3000 rpm
 1000 rpm
 1500 rpm

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Electrical Machines
Which of the following statement is correct, if short circuit ratio is high?

 Low short circuit current
 High voltage regulation
 Good voltage regulation
None of these

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Electrical Machines
A series generator is connected in series to a feeder having 0.5Ω resistance to boost the voltage. The induced voltage is given by Eg = 0.6Ia, Ra = 0.2Ω and Rs = 0.3Ω. Find the voltage boosted by the generator, when delivering 400 Amp?

 90 V.
 40 V.
 30 V.
 60 V.

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Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 Greater than 90o.
 0o.
 less than 90o.
 90o.

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