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Electrical Machines

Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 30°
 36°
 18°
 72°

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Electrical Machines
The no load and full load speed of DC motor are 1400 rpm and 1200 rpm respectively. What is the percentage speed regulation of the motor ?

 16.67%.
 18.25%.
 14.28%.
 15.30%.

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Electrical Machines
The change in speed of a DC generator due to increased load is corrected by

  increasing armature resistance.
 increasing armature cooling.
  increasing input power of the prime mover.
  increasing terminal voltage.

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Electrical Machines
A 500 V, 120 KW, 50 Hz, star connected synchronous motor operating at 0.8 power factor leading has full load efficiency of 91%. The armature resistance is equal to 0.08Ω. The magnitude of armature current is nearly equal to

 240 A.
  190 A.
 173 A.
 127 A.

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Electrical Machines
Value of specific electric loading of Induction motor is in the range of

 30000 - 100000 ampere conductor / metre.
  400 - 4000 ampere conductor / metre.
  5000 - 45000 ampere conductor / metre.
 40 - 400 ampere conductor / metre.

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Electrical Machines
Crawling in an induction motor is due to

  time harmonics in supply.
  slip ring rotor.
  space harmonics produced by winding currents.
  insufficient starting torque.

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