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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

 1000 rpm
 250 rpm
 500 rpm
 2000 rpm

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Electrical Machines
In dc machine armature windings are placed on rotor because of the necessity for

 commutation.
 electromechanical energy conversion.
 development of torque.
 generation of voltage.

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Electrical Machines
In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be

  cross-magnetisation.
 demagnetisation.
  cross-magnetization as well as demagnetization.
  none of above.

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

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

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Electrical Machines
In above question, find rms line voltage for delta connection?

 50 V.
 100 V.
 399 V.
  230.2 V.

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Electrical Machines
A 240 V, dc shunt motor draws 15 A while supplying the rated load at a speed of 80 rad/s. The armature resistance is 0.5 W and the field winding resistance is 80 W. The net voltage across the armature resistance at the time of plugging will be

 474 V
 6 V
 240 V
 234 V

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