1000+ Machine Design Questions and Answers Pdf - 2

Question: 6

Which of the following is an advantage of hydrogen cooling?

(A) smaller size of coolers

(B) increase in life

(C) increase in rating

(D) increase in efficiency

Question: 7

Materials exhibiting zero value of resistivity are known as

(A) superconductors

(B) insulators

(C) semiconductors

(D) conductors

Question: 8

_____ brushes are fragile and cause excessive wear of commutator.

(A) metal graphite

(B) electro-graphite

(C) hard carbon

(D) natural graphite

Question: 9

With conventional hydrogen cooling it is possible to increase the rating of a single unit to

(A) 50 MW

(B) 100 MW

(C) 200 MW

(D) 500 MW

Question: 10

_____ is universally used for windings of electrical machines because it is easily workable without any possibility of fracture.

(A) aluminium

(B) copper

(C) silver

(D) steel