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Electrical Machines

Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is

 60
 600
 660
 40

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Electrical Machines
Armature flux is.............with respect to main field flux or main field poles?

 stationary
None of these
 rotates same direction
 rotates opposite direction

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Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

 100 W, 2000 W.
  3190 W, 5040 W.
 1000 W, 5040 W.
 6000 W, 7000 W.

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Electrical Machines
The shaft of induction motor should be

  stiff.
  any of these.
  hollow.
  flexible.

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Electrical Machines
Quadrature axis synchronous reactance is the ratio of

 Vmax to Imax.
 Vmin to Imax.
 Vmax to Imin.
 Vmin to Imin.

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Electrical Machines
A shaded pole single phase induction motor can be used for

 wet grinders
 food mixers
 personal computers as cooling fan
 tape recorders

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