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Electrical Machines

Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 less than 50%.
 between 50% and 90%.
 more.
 same.

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Electrical Machines
A transformer has resistance and reactance in per unit as 0.01 and 0.04 respectively. Its voltage regulation for 0.8 power factor lagging and leading will be

None of these
 4.8% and -3.2%
 6% and -4%
 3.2% and -1.6%

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Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

 Yoke.
  Commutator.
 Brush.
 Armature.

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Electrical Machines
Which of the following will vary the maximum torque?

None of these
 rotor resistance R
 both 1 and 2
 rotor reactance X

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Electrical Machines
When a DC cummulative compound wound motor is loaded

 Torque and speed both increase.
 Torque decrease and speed increases.
 Both torque and speed decrease.
  Torque increase and speed decrease.

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Electrical Machines
A triangular mmf wave is produced in the air gap of an electric machine. Such wave is produced by

 rotor of an synchronous machine.
 rotor of a dc machine.
 stator of a dc machine.
 stator of a induction machine.

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