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Electrical Machines

Electrical Machines
If terminal voltage of one 1000 rpm shunt motor is reduced to half the speed of the motor will be

 2000 rpm
 250 rpm
 1000 rpm
 500 rpm

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Electrical Machines
The basic function of a transformer is to change

 the power level
 the power factor
 the level of the voltage
 the frequency

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Electrical Machines
Which of the following DC motors has got maximum relieving property?

 Shunt.
  Series.
 Cummulative compound.
 Differentical compound.

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

 cant be determined.
 266.20 N-m.
 234.76 N-m.
 133.22 N-m

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Electrical Machines
The wattage rating of a ceiling fan motor will be

 250 - 500 W.
 10 - 20 W.
  50 - 150 W.
 200 - 250 W.

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Electrical Machines
With the increases in field excitation of a DC generator, its generated emf

  increases upto a limit and then remains almost constant.
  decreases.
  remains constant.
 increases.

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