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Electrical Machines

Electrical Machines
At stand still condition the value of slip is

 finite value
 infinite value
 1
 0

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Electrical Machines
A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be

 15.92 Nm
 15.28 Nm
 16.55 Nm
 15.6 Nm

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Electrical Machines
Which of the following methods of speed control is not affected through stator side?

  Change of supply voltage.
  Change of number of pole.
  Change of rotor resistance.
  Change of supply frequency.

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Electrical Machines
A synchronous machine has P number of poles, find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm)?

 ωe = 2/P*ωm
 ωe = P/2*ωm
 ωe = ωm
 ωe = P*ωm

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Electrical Machines
Stability of a synchronous motor ---------- with the increase in excitation.

 decreases
 any of the above
 remains unaffected
 increases

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Electrical Machines
The application that need frequent starting and stopping is

  jaw crushers.
  paper mills.
  lifts and hoists.
  blowers.

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MORE MCQ ON Electrical Machines

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