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Electrical Machines

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

 Speed regulation.
 Running Torque.
  Effiency.
 Starting torque.

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Electrical Machines
What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field?

None of these
 Zero
 Slip speed
 Synchronous speed

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

 14.28%.
 15.30%.
  16.67%.
 18.25%.

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Electrical Machines
Consider the following statements : For a level compounded dc generator to run at constant voltage, the series field mmf must effectively compensate 1. armature reaction mmf 2.armature resistance drop 3. brush contact voltage drop Which of these statements is/are correct ?

 1 and 3
 1 and 2
 1, 2 and 3
 2 alone

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Electrical Machines
Which of the following transformer insulating oil generally used in India?

 Olefin based insulating oil.
  Paraffin based insulating oil.
 Aromatics based insulating oil.
 Naphtha based insulating oil.

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Electrical Machines
A frog leg winding is used in a DC machine to eliminate

 the use drum winding.
 reactance voltage produced due to communication.
  the use equalizer in lap winding.
 the use of compensating winding.

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MORE MCQ ON Electrical Machines

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