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Electrical Machines

Electrical Machines
Universal motor have which of the following application?

  Food mixer.
  Lift.
  Domestic pump.
  Traction.

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Electrical Machines
On which of the following factor/factors the speed of a DC motor depends upon?

 Applied voltage.
 Field flux.
 Armature current.
 All of these.

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Electrical Machines
A DC generator beyond critical resistance will generate

 maximum current.
 maximum power.
 no voltage.
 maximum voltage.

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Electrical Machines
DC series motor is best suited for electric traction as

 It runs at very high speed at light load.
 It consume less power.
 It is cheaper in cost.
  It develops high starting torque.

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Electrical Machines
Field divertor method of speed control of a DC series motor gives speed above rated one due to reduction of

 None of above.
 Field current.
 Line current.
 Armature current.

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Electrical Machines
In dc machines, 1. reactance voltage is proportional to armature current 2.reactance voltage is proportional to core length 3.reactance voltage is due to self-flux of the coil undergoing commutation 4. armature-cross flux is neutralized by interpolar flux 5. interpolarmmf is more than armature mmf in the interpolar zone From these, the correct answer is

 2, 3, 4
 1, 2, 5
 1, 3, 5
 1, 2, 3, 4

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