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Electrical Machines

Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 rectangular
 flat-topped
 co- sinusoidal
 sinusoidal

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 slip speed.
 normal speed.
 any of the above.
 synchronous speed.

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Electrical Machines
When operating, two or more transformers in parallel, % impedance of these transformers should be

 such that actual impedance of all transformers would be same.
 inversely proportional to MVA rating of transformers.
 proportionate to MVA rating of transformers.
  same.

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Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  f / s.
  s2.
  sf / 2.
  sf.

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Electrical Machines
Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque

 Separately Excited DC Motor
 DC Shunt Motor
 Compound Wound DC Motor
 DC Series Motor

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Electrical Machines
In case of a compensated DC series motor, the compensating winding is provided

 In parallel with the armature winding.
 As a separate unit.
 In parallel with the field winding.
  In series with the armature winding.

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MORE MCQ ON Electrical Machines

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