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Electrical Machines

Electrical Machines
Hopkinson test is conducted under which of the following condition?

 any of the above
 half load
 no load
 full load

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Electrical Machines
Which of the following relation is correct?

None of these
 Xd = Xq.
 Xd > Xq.
 Xd < Xq.

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Electrical Machines
Which of following DC motors will have percentage increase of input current for the same percentage increase in torque?

 Differntical compound.
 Series.
  Shunt.
 Cummulative compound.

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Electrical Machines
Which of the following motors has negative speed regulation?

 Series motors.
 Both B and C.
 Shunt motors.
 Differential compound motors.

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Electrical Machines
The air gap between the yoke and armature is dc machine is kept very small

All of these
 to avoid over heating.
 to avoid locking of the armature.
 to achieve a stronger magnetic field.

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Electrical Machines
If an additional resistance is connected in series with a DC series motor operating at rated speed, the speed of the motor will

 Reduce.
 Increase.
 Oscillate around the normal speed.
 Remain unaltered.

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