Eddy currents are induced in the pole shoes of a D.C. machine due to______________?

Byadmin July 5, 2018August 11, 2021

Eddy currents are induced in the pole shoes of a D.C. machine due to______________?

A. oscillating magnetic field
B. pulsating magnetic flux
C. relative rotation between field and armature
D. all above

D.C. Generators

In case of D.C. machines, mechanical losses are primary function of____________?

In case of D.C. machines, mechanical losses are primary function of____________?

A. current
B. voltage
C. speed
D. none of above

Read More In case of D.C. machines, mechanical losses are primary function of____________?
D.C. Generators

Armature reaction in a generator results in_____________?

Armature reaction in a generator results in_____________?

A. demagnetisation of leading pole tip and magnetisation of trailing pole tip
B. demagnetisation of trailing pole tip and magnetisation of leading pole tip
C. damagnetising the center of all poles
D. magnetising the center of all poles

Read More Armature reaction in a generator results in_____________?
D.C. Generators

For both lap and wave windings, there are as many commutator bars as the number of_____________?

For both lap and wave windings, there are as many commutator bars as the number of_____________?

A. slots
B. armature conductors
C. winding elements
D. poles

Read More For both lap and wave windings, there are as many commutator bars as the number of_____________?
D.C. Generators

Which of the following generator will have negligible terminal voltage while running on no-load?

Which of the following generator will have negligible terminal voltage while running on no-load?

A. Series generator
B. Shunt generator
C. Compound generator
D. Separately excited generator

Read More Which of the following generator will have negligible terminal voltage while running on no-load?
D.C. Generators

Which of the following components of a D.C, generator plays vital role for providing direct current of a D.C. generator ?

Which of the following components of a D.C, generator plays vital role for providing direct current of a D.C. generator ?

A. Dummy coils
B. Commutator
C. Eye bolt
D. Equilizer rings

Read More Which of the following components of a D.C, generator plays vital role for providing direct current of a D.C. generator ?
D.C. Generators

Satisfactory commutation of D.C. machines requires______________?

Satisfactory commutation of D.C. machines requires______________?

A. brushes should be of proper grade and size
B. brushes should smoothly run in the holders
C. smooth, concentric commutator properly undercut
D. all of the above

Read More Satisfactory commutation of D.C. machines requires______________?

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