[Solved] Copper brushes in D.C. machine are used

McqMate

Q.	Copper brushes in D.C. machine are used
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
Answer» A. where low voltage and high currents are involved

2.4k

0

Do you find this helpful?

19

View all MCQs in

Electrical Machine 1

Discussion

No comments yet

Related MCQs

If brushes of a D.C. generator are moved in order to bring these brushes in magnetic neutral axis, there will be
The full-load copper loss of a trans¬former is 1600 W. At half-load, the copper loss will be
Auto-transformer makes effective saving on copper and copper losses, whenits transformation ratio is
In lap winding, the number of brushes is always
Brushes of D.C. machines are made of
The material for commutator brushes is generally
In D.C. generators, the brushes on commutator remain in contact with conductors which
The number of brushes in a commutator depends on
In a D.C. generator in order to reduce sparking at brushes, the self-induced e.m.f. in the coil is neutralised by all of the following except
To achieve sparkless commutation brushes of a D.C. generator are rockedm ahead soas to bring them