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Electrical Machines

Electrical Machines
In alternator, the rotary part is

 armature.
  magnetic field poles.
 core.
 none of these.

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Electrical Machines
Find the developed torque DC Series Motor having armature resistance of 0.2 Ω and taking armature current of 60 A is connected to 250 V supply. Considered brush drop of 1 V each.

 cant be determined.
 266.20 N-m.
 133.22 N-m
 234.76 N-m.

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Electrical Machines
For a standard frequency the machine operates at a particular speed known as

 synchronous speed.
 normal speed.
 any of the above.
 slip speed.

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Electrical Machines
In circle diagram for induction motor, diameter of circle represents which of the following ?

 Running torque.
 Line voltage.
 Slip.
 Rotor current.

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Electrical Machines
Which of following motor is preferred for belt conveyor?

  Synchronous motors.
  Universal motor.
  Slip ring induction motor.
  Reluctance motor.

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Electrical Machines
If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?

  It will be doubled.
 It will remain the same.
  It will be halved.
  It will becomes four times.

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