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Electrical Machines

Electrical Machines
Which of the following represents the pitch factor?

 Cos α
 sin (α/2)
 Cos α²
 Cos (α/2)

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Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 20.
  0.05.
  0.905.
 1.1.

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Electrical Machines
DC series motor is best suited for electric traction as

  It develops high starting torque.
 It runs at very high speed at light load.
 It is cheaper in cost.
 It consume less power.

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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will

 increase gradually and then stay at rated voltage
 decrease
 increase to rated voltage and then may decrease
 remain nearly constant

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Electrical Machines
A separately excited DC motor has an armature resistance of 0.5 Ohm. The supply voltage is 250V. Armature current is 20A and the speed of rotation is 1500 rpm. Find the torque developed?

 15.28 Nm
 15.6 Nm
 16.55 Nm
 Zero

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Electrical Machines
A smaller air gap in a polyphase induction motor helps to

  reduce the chance of cogging.
  reduce the chance of crawling.
  reduce the magnetizing current.
  increase the starting torque.

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MORE MCQ ON Electrical Machines

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