Copper brushes in D.C. machine are used_____________?

D.C. Generators 06/05/2020

A. where low voltage and high currents are involved
B. where high voltage and small cur-rents are involved
C. in both of the above cases
D. in none of the above cases

Related Mcqs:

    In case of D.C. machines, mechanical losses are primary function of____________?
    A. current B. voltage C. speed D. none of above...
    Brushes of D.C. machines are made of_________?
    A. carbon B. soft copper C. hard copper D. all of above...
    The e.m.f. induced in the armature of a shunt generator is 600 V. The armature resistance is 0.1 ohm. If the armature current is 200 A, the terminal voltage will be_____________?
    A. 640 V B. 620 V C. 600 V D. 580 V...
    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 purpose of providing dummy coils in a generator is__________________?
    A. to reduce eddy current losses B. to enhance flux density C. to amplify voltage D. to provide mechanical balance for the rotor...

Leave a Reply

Your email address will not be published. Required fields are marked *