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Electrical Machines

Electrical Machines
The armature voltage control is considered suitable for a DC motor driven at constant

 power.
 torque.
 current.
 speed.

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Electrical Machines
Generator works on the principle of production

 both A and B.
 dynamically induced emf.
 static induced emf.
None of these

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Electrical Machines
The slight curvature at the lower end of the OCC of a self excited DC generator is due to

  magnetic inertia.
  residual flux.
  high field resistance.
  high speed.

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Electrical Machines
A 3-phase, alternator has generated emf per phase of 230 V with 10% 3rd harmonic and 6% 5th harmonic content. Calculate rms line voltage for star connection.

 50 V.
 100 V.
 399 V.
  230.2 V.

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Electrical Machines
A simple method of increasing the voltage of a DC generator is to

 increase the number of turns in armature coil.
  increase the speed of shaft rotation.
 increase the source frequency.
 increase the number of turns in field coil.

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Electrical Machines
Synchronous reactance of an alternator represents

 a reactance operating at synchronous speed
 field winding reactance
 armature reactance and leakage reactance
All of these

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MORE MCQ ON Electrical Machines

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