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Electrical Machines

Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 between 50% and 90%.
 same.
 less than 50%.
 more.

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Electrical Machines
A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

 230 V
 somewhat less than 230 V
 somewhat more than 230 V
 6 V

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Electrical Machines
Torque developed in the rotor is

 directly proportional to slip
 either of these
 not dependent on the slip
 inversely proportional to slip

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Electrical Machines
If the field connection of a DC Shunt Motor is changed then

 it will run in same direction.
 it will run in opposite direction.
 it will run in same direction by slowly.
 motor will not run.

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors with armature resistance of 0.6 ohm. Calculate the starting current flowing through the armature if the supply voltage is 240 volt.

 320 Amp.
  400 Amp.
 800 Amp.
  0.5 Amp.

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Electrical Machines
When Flemings right hand rule to find the direction of induced emf, the thumb points towards

 direction of flux.
 direction of induced emf.
 direction of motion of the conductor.
 opposite to the direction of motion of the conductor.

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