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Electrical Machines

Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 2 V
 0 V
 4 V
 1 V

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Electrical Machines
The sparking at the the brushes, in a DC machines is due to

 presence of commutator.
 high resistance of carbon brushes.
  reactance voltage.
 armature reaction.

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Electrical Machines
In dc machines, the field-flux axis and armature-mmf axis are respectively along

 quadrature axis and interpolar axis
 quadrature axis and direct axis
 direct axis and indirect axis
 direct axis and interpolar axis

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Electrical Machines
A load of 900 lbs is to be raised with a lift car weighting 855 lbs at a speed of 110 feet per minute, the over balance being 40 % and percentage efficiency 45 %. Find the horse power of the motor without counterweight

 170.
 180.
  150.
 160.

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Electrical Machines
What is the emf generated by a 4 pole Lap connected DC Motor rotating at 1500 rpm having 1000 conductors and useful flux per pole is 0.4 mWb.

 10 volts.
 20 volts.
 30 volts.
 40 volts.

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Electrical Machines
In a seperately excited DC Motor if field current is increased, it will

 Reduce armature heating.
 Increase acceleration duration.
 Increase speed
 Reduce starting torque.

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