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Electrical Machines

Electrical Machines
Which motor cannot be started on no load?

 both B and C
 series motors
 shunt motors
 cumulative compound motors

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Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 f²
 f
 V
 V²

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Electrical Machines
In circle diagram for induction motor, diameter of circle represents which of the following ?

 Rotor current.
 Running torque.
 Line voltage.
 Slip.

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Electrical Machines
A 4 pole wave wound dc motor having flux per pole of 9.56 X 10-3 Wb contains 460 armature conductors. Calculate the back emf produced when it is running at a speed of 1500 rpm.

 240 volt.
 230 volt.
  220 volt.
 440 volt.

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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?

 15.6 Nm
 Zero
 15.28 Nm
 16.55 Nm

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Electrical Machines
Consider the following statements : 1. interpole windings are connected in series with armature windings 2. polarity of interpoles must be the same as that of the main poles in advance 3. distortion of the main field under the pole shoes is not affected by the use of interpoles From above, the correct answer is

 1 alone
 1 and 2
 2 and 3
 1 and 3

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