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Electrical Machines

Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 115 V.
 200 V.
 230 V.
 460 V.

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Electrical Machines
In shunt dc motor the direction of rotation of the motor will reversed. When

  either field terminals are reversed or armature terminals are reversed.
  none of above.
  only armature terminals are reversed.
  only field terminals are changed.

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Electrical Machines
What is/are the advantages of parallel operation of alternators?

 continuity supply is maintained
All of these
 Increase efficiency under light load conditions
 Increase in reliability

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Electrical Machines
If B is flux density, l the length of the conductor and v the velocity of the conductor, then emf is given by

 Blv2.
 Bl2v2.
 Blv.
 Bl2v.

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Electrical Machines
Capacitor start capacitor run provides

  high staring torque and high power factor.
  high power factor only.
  high staring torque only.
  none.

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Electrical Machines
For pure resistive load what is the armature reaction?

 magnetization
 cross magnetization
 demagnetization
All of these

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