In a D.C. generator the critical resistance refers to the resistance of_____________?

Related Mcqs:

The resistance of armature winding depends on

A. length of conductor B. cross-sectional area of the conductor C. number of conductors D. all of the above...

The insulating material used between the commutator segments is normally_____________?

A. graphite B. paper C. mica D. insulating varnish...

Compensating windings are used in D.C. generators______________?

A. mainly to reduce the eddy currents by providing local short-circuits B. to provide path for the circulation of cooling air C. to neutralise the cross-magnetising effect of the armature reaction D. none of the above...

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...

When two D.C. series generators are running in parallel, an equilizer bar is used________________?

A. to increase the speed and hence generated e.m.f. B. to increase the series flux C. so that two similar machines will pass approximately equal currents to the load D. to reduce the combined effect of ar-mature reaction of both machines...