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Electrical Machines

Electrical Machines
Hysteresis loss will depends on

 f
 f³
 f²
 f1.6

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Electrical Machines
In which of the following motors DC excitation is not required?

 reluctance motor
 3-phase synchronous motor
 3-phase synchronous generator
 hysteresis motor

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Electrical Machines
A 4 pole dc motor with armature winding resistance of 0.6 ohm receives a supply of 230 Volt. If the back emf produced during running condition is equal to 210 volt. Calculate the current flowing through the armature at this point.

 44.47 Amp.
  33.33 Amp.
  43 Amp.
 29 Amp.

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Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for

 development of torque
 electromechanical energy conversion
 generation of voltage
 commutation

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Electrical Machines
The maximum possible speed at which an alternator can be driven to generate 50 Hz and 4000 V is

  1500 rpm.
  3000 rpm.
  4000 rpm.
  3600 rpm.

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Electrical Machines
A 4 pole dc generator is running at 1500 rpm the frequency of current in the armature winding is

 100Hz.
 200Hz.
 50Hz.
 150Hz.

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MORE MCQ ON Electrical Machines

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