In D.C. generators, the cause of rapid brush wear may be___________?

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...

Brushes of D.C. machines are made of_________?

A. carbon B. soft copper C. hard copper D. all of above...

Two generators A and B have 6-poles each. Generator A has wave wound armature while generator B has lap wound armature. The ratio of the induced e.m.f. is generator A and B will be_______________?

A. 2 : 3 B. 3 : 1 C. 3 : 2 D. 1 : 3...

Following D.C. generator 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. self-excited generator...

The open circuit voltage of a compound generator is 250 V. At full load the terminal voltage____________?

A. will be less than 250 V B. will always be 250 V C. may be greater or less than 250 V D. none of the above...