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Electrical Machines

Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 25 Hz
 100 Hz
 50 Hz
 0 Hz

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Electrical Machines
In a DC compound motor the field regulator is provided to

 control the armature flux.
 limit the armature current.
 demagnetize the field partially.
 control the field flux.

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Electrical Machines
The basic function of a transformer is to change

 the power level
 the frequency
 the power factor
 the level of the voltage

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Electrical Machines
A motor armature conductor of length 0.5 m is exposed to a flux density of 4 Wb / m2. Calculate the force experienced by the conductor, when the armature current is 5 Amp?

  Can't be determined.
 20 N.
  None of these.
  15 N.

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Electrical Machines
Universal motors are used in

All of these
 food processing
 traction
 cranes

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Electrical Machines
Value of specific electric loading of Induction motor is in the range of

  400 - 4000 ampere conductor / metre.
 40 - 400 ampere conductor / metre.
  5000 - 45000 ampere conductor / metre.
 30000 - 100000 ampere conductor / metre.

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