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Electrical Machines

Electrical Machines
When maximum starting torque is obtained, rotor power is

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Electrical Machines
In which of the following speed control of DC motor the speed obtained is below than the rated speed?

 Armature circuit resistance control.
 Field resistance control.
 Any of above.
 Armature voltage control.

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Electrical Machines
A dc series motor driving and electric train faces a constant power load. It is running at rated speed and rated voltage. If the speed has to be brought down to 0.25 p.u. the supply voltage has to be approximately brought down to

  0.5 p.u
  0.125 p.u
  0.75 p.u
  0.25 p.u

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Ward-Leonard control.
 Field control.
 Multiple voltage control.
 Armature control.

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Electrical Machines
Armature reaction in DC generators will result in

 short circuit.
 open circuit.
 increase in slip.
 reduction in generated emf.

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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

 Blv.
 Bl2v.
 Blv2.
 Bl2v2.

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