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

 234 V
 6 V
 240 V
 474 V

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Electrical Machines
An alternator is feeding an infinite busbar. Its prime mover is suddenly shutdown. The alternator will

 come to stand still.
 continue to work as synchronous motor with same direction of rotation.
 start working as induction motor.
 continue to work as alternator but the direction of rotation will reverse.

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Electrical Machines
Due to magnetic saturation, the flux per pole in a DC machine without brush shift

  decreases in both generators and the motors with load.
 increases in both the generators and the motors with load.
 decreases in generators and increases in motor with load.
 increases in generators but decreases in motor with load.

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