Brushes of D.C. machines are made of_________? – McqOptions

MCQOPTIONS

1.	Brushes of D.C. machines are made of_________?
A.	carbon
B.	soft copper
C.	hard copper
D.	all of above
Answer» B. soft copper

Discussion

No Comment Found

Related MCQs

<p> Which of the following components of a D.C, generator plays vital role for providing direct current of a D.C. generator ?</p>
<p> In D.C. generators the polarity of the interpoles_____________?</p>
<p> A sinusoidal voltage of 5 Hz is applied to the field of a shunt generator. The armature voltage wave will_____________?</p>
<p> If B is the flux density, I the length of conductor and v the velocity of conductor, then induced e.m.f. is given by______________?</p>
<p> Copper brushes in D.C. machine are used_____________?</p>
<p> In case of D.C. machines, mechanical losses are primary function of____________?</p>
<p> If a D.C. generator fails to build up the probable cause could not be_____________?</p>
<p> In a four-pole D.C. machine____________?</p>
<p> A separately excited generator as compared to a self-excited generator_____________?</p>
<p> In lap winding, the number of brushes is always_____________?</p>