Satisfactory commutation of D.C. machines requires

Home / Engineering / D.C. Generators / Question

M

Mr. Dubey • 51.43K Points
Coach

Q.) Satisfactory commutation of D.C. machines requires

(A) brushes should be of proper grade and size

(B) brushes should smoothly run in the holders

(C) smooth, concentric commutator properly undercut

(D) all of the above

Correct answer : Option (D) - all of the above

Share

Discusssion

Login to discuss.

Related MCQs on D.C. Generators

Q. Which of the following happens when start Delta starter is used ?

Q. An increase in gain, in most systems, leads to

Q. With a D.C. generator which of the following regulation is preferred ?

Q. For Colpitts oscillator, the capacitors C1 and C2 in the feedback network are 1 µF and 25 µF respectively. Then the β value of the transistor is:

Q. In the cables, sheaths are used to

Q. Due to which of the following reasons excessive bond width in control systems should be avoided ?

Q. The efficiency of diesel locomotives is nearly

Q. Which of the following protects a cable against mechanical injury ?

Q. Oscillators operating at millimeter wavelength are difficult to realize and are also less efficient.

Q. In crossed field tubes, the electron beam traverses the length of the tube and is parallel to the electric field.