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Electrical Machines

Electrical Machines
In a dc machine 72 number of coils are used. Find the number of commutator segments required?

 74
 37
 72
 36

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Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 30°
 36°
 72°
 18°

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Electrical Machines
If we increase the rotor reactance value, the maximum torque will

 increase
 decrease
 not changed
None of these

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Electrical Machines
What is the effect of armature reaction ?

  Both option B and C.
 None of the options.
 Armature flux weakens the main field flux.
 Armature flux distorts the main field flux.

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Electrical Machines
Which one of the following statement is correct ? In an induction motor if the air gap is increased then

 its power factor will reduce
 its speed will reduce
 its efficiency will improve
 its speed will increase

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Electrical Machines
If field current is decreased in shunt dc motor, the speed of the motor

 remains same.
None of these
 increases.
 decreases.

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