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Electrical Machines

Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  √Ia.
  1/Ia.
  Ia2.
  Ia.

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

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

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Electrical Machines
A 250 volt dc series motor having an armature resistance of 0.2 Ω takes a load current of 60 A. What will be the torque produced at the shaft of the motor? Consider brush drop of 1V.

 266.20 N-m.
 133.22 N-m
 234.76 N-m.
 can not be determined.

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Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

 1000.
 2000.
 0.
 500.

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Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 unity
 0.2 lead
 0.2 lag
 0.9 lag

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Electrical Machines
Which type of motors uses slip rings?

 Both Synchronous and Induction motor
 DC Shunt Motor
 Induction motors
 Synchronous motors

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MORE MCQ ON Electrical Machines

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