Electrical Machines: D.C. Machine as a Generator

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10 Questions

What principle do all generators work on?

Faraday's law of electromagnetic induction

What determines the magnitude of the induced e.m.f in a conductor?

Rate of change of flux associated with the conductor

What is the relative motion required to induce an e.m.f in a conductor?

Rotating conductor with respect to flux or rotating flux with respect to a conductor

What is the winding formed by connecting a number of conductors together called?

Armature winding

What part of a D.C. machine is the armature winding kept on?

Armature

What is the function of the yoke in a DC machine?

To protect insulating materials from atmospheric elements

Why is cast iron chosen for making the yoke in a DC machine?

It is the cheapest material available

What is the function of the pole shoe in a DC machine?

To enlarge the area of armature core to come across the flux

Why is a laminated construction used for making the poles in a DC machine?

It requires a definite shape and size

What is the role of the field winding in a DC machine?

To produce the magnetic flux

Explore the principle of dynamically induced e.m.f in D.C. machines and how generators work based on Faraday's law of electromagnetic induction. Learn about the magnitude of the induced e.m.f in a conductor.

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