Following energized winding of a D.C. machine should not be opened as it would produce high inductive voltage which may be dangerous to personnel and may cause its own insulation failure.

Related Mcqs:

Fleming’s right-hand rule regarding direction of induced e.m.f., correlates__________?

A. magnetic flux, direction of current flow and resultant force B. magnetic flux, direction of motion and the direction of e.m.f. induced C. magnetic field strength, induced voltage and current D. magnetic flux, direction of force and direction of motion of conductor...

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...

To avoid formation of grooves in the commutator of a D.C. machine?

A. the brushes of opposite polarity should track each other B. the brushes of same polarity should track each other C. brush position has no effect on the commutator grooving D. None...

Which of the following D.C. generators will be in a position to build up without any residual magnetism in the poles?

A. Series generator B. Shunt generator C. Compound generator D. None of the above...

Shunt generators are most suited for stable parallel operation because of their______________?

A. rising voltage characteristics B. identical voltage characteristics C. drooping voltage characteristics D. linear voltage characteristics...