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Electrical Machines

Electrical Machines
On what factors the speed of dc motor depends?

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

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Electrical Machines
The shaft of induction motor should be

  flexible.
  stiff.
  hollow.
  any of these.

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Electrical Machines
A dc shunt motor runs at a no-load speed of 1140 rpm. At full load, armature reaction weakens the main flux by 5% whereas the armature circuit voltage drops by 10%. The motor full-load speed in rpm is

 1203
 1080
 1000
 1200

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Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 decreases
 remains unaffected
 any of the above
 increases

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Electrical Machines
Ward Leonard control provides speed control

 in one direction only.
 in both direction.
 below rated speed.
 above rated speed.

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Electrical Machines
The core flux in transformer depends mainly on

 supply voltage and frequency
 supply voltage, frequency and load
 supply voltage and load
 supply voltage

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