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Electrical Machines

Electrical Machines
The principle of dynamically induced emf is utilized in

 generator.
 transformer.
 thermocouple.
 choke.

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Electrical Machines
If an induction machine is run at above the synchronous speed it acts as

 a synchronous motor
 an induction generator
None of these
 an induction motor

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Electrical Machines
A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed?

 Zero
 15.6 Nm
 16.55 Nm
 15.28 Nm

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Electrical Machines
At what power factor, the voltage regulation of a transformer can be zero ?

 Zero power factor.
 Unity power factor.
  Leading power factor.
 Lagging power factor.

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Electrical Machines
In DC generator, full form of MNA is what?

 Magnetic neutral armature co-ordinate.
  Magnetic neutral axis.
 Magnetically no-load armature co-ordinate.
 Magnetic no-load axis.

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Electrical Machines
Compensating winding is placed in the

 armature core
All of these
 pole shoe
 main field

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MORE MCQ ON Electrical Machines

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