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Electrical Machines

Electrical Machines
If input of a transformer is square wave the output will be

 triangular wave.
  pulsed wave.
 sine wave.
 square wave.

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Electrical Machines
The rotor of a three phase induction motor has an impedance of 0.4 + j4 ohm per phase at standstill the maximum torque occurs at a slip of _____________.

 15 %.
  10 %.
 50 %.
 25 %.

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Electrical Machines
The heat transfer by convection in a transformer least depends on

 air velocity.
 temperature difference.
 surface area.
  color of the paint.

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Electrical Machines
In 3 - Φ induction motor some times copper bars are placed deep in the rotor to

  improve starting torque.
  improve efficiency.
  reduce copper loss.
  improve power factor.

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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
 15.6 Nm
 16.55 Nm

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Electrical Machines
If the back emf in DC motor vanishes suddenly the motor will

 run at very low speed.
 run at very high speed.
 start haunting.
 burn.

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MORE MCQ ON Electrical Machines

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