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Electrical Machines

Electrical Machines
The slip of an induction motor during DC rheostatic braking is

 1 - s.
  2 - s.
 2 + s.
  s.

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Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 460 V.
 230 V.
 200 V.
 115 V.

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Electrical Machines
The size of inter poles is small as compared to main poles. What is the reason?

 In order to get more flux.
 In order to get saturated.
 In order to not to get saturated.
All of these

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Electrical Machines
Which of the following represents the rotating losses of machine?

 Friction and windage losses
 All of the them
 Hysteresis losses
 Eddy current losses

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Electrical Machines
DC machine is a

 none of above are correct.
 both are correct.
 convection machine.
 conduction machine.

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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?

 Zero
 15.6 Nm
 16.55 Nm
 15.28 Nm

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