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Electrical Machines

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

 72°
 30°
 18°
 36°

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Electrical Machines
Crawling in an induction motor is due to

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

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Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)

 T∝ P
 T∝ P²
 T∝ P³
 T is independent of P

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Electrical Machines
Eb/V ratio of a DC motor is an indication of

 Starting torque.
 Speed regulation.
 Running Torque.
  Effiency.

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Electrical Machines
An induction motor has a rotor resistance of 0.002 Ω / phase. If the resistance is increased to 0.004 Ω / phase then the maximum torque will

 increase by 100%
 reduced to half
 remain unaltered
 increase by 200%

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Electrical Machines
The speed regulation of a DC motor is given as

 NnL/NfL.
 (NfL − NnL)/NnL.
 NnL − NfL.
 (NnL − NfL)/NfL.

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