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Electrical Machines

Electrical Machines
An ideal DC generated is one that has _____________ voltage regulation.

 negative.
  zero.
 low.
 positive.

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Electrical Machines
A smaller air gap in a induction motor helps to

 reduce the magnetizing current.
 increase the starting torque.
 reduce the chance of cogging.
 reduce the chance of crawling.

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Electrical Machines
Universal motors are used in

 cranes
All of these
 food processing
 traction

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Electrical Machines
A 3 - Φ, 12 pole, 600 V, 50 Hz star connected IM has rotor resistance and stand still resistance of 0.03 Ω and 0.5 Ω respectively. The speed of maximum torque will be

 540 rpm.
  240 rpm.
 450 rpm.
  470 rpm.

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

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Electrical Machines
A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction is

 magnetizing.
 ineffective.
 cross – magnetizing.
  demagnetizing.

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MORE MCQ ON Electrical Machines

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