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Electrical Machines

Electrical Machines
What is the increase in the torque expressed as percentage of initial torque, if current drawn by the dc series motor is increased from 10A to 11A?

 11%
 21%
 41%
 10%

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Electrical Machines
An induction motor having 8 poles runs at 727.5 rpm. If the supply frequency is 50Hz, the emf in the rotor will have a frequency of

 1.5Hz
 48.5Hz
 2.5Hz
 51.5Hz

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Electrical Machines
It is advisable to start a DC series motor with some load to

 Limit the current.
 Limit the flux.
  Limit the speed.
 Avoid sparking.

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Electrical Machines
Drop in speed from no load to full load is very high in

  Series motor without interpoles.
 Cummulative compound motor with interpoles.
 Shunt motor with interpoles.
 Series motor with interpoles.

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Electrical Machines
In induction motor wound rotor motor is mainly is used in application where

  low starting torque.
  high starting torque.
  less costly motor is not required.
 power factor is less.

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

 rotates opposite direction
None of these
 stationary
 rotates same direction

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