7000+ GATE Mechanical Question Paper with Solutions Pdf - 2

Question: 6

Carbon steel is

(A) An alloy of carbon generally obtained by adding graphite to low carbon steels

(B) An alloy of carbon and iron obtained by oxidising excessive carbon steel

(C) An alloy of carbon and iron obtained by oxidising excessive carbon from cast iron

(D) An alloy of carbon and iron with varying quantities of phosphorous

Question: 7

In cold working metals

(A) Close dimensional tolerance cannot be maintained

(B) Grain structure remains unchanged

(C) Recrystallization temperature for steel is reduced

(D) Poor surface finish is obtained

Question: 8

When elastic limit is reached

(A) Tensile strain decreases more quickly

(B) Tensile strain increases more quickly

(C) Tensile strain increases in proportion to stress

(D) Tensile strain decreases in proportion to stress

Question: 9

Which of the following material can be used at temperature above 100°C?

(A) Teflon

(B) Polythene

(C) Rubber

(D) Paraffin wax

Question: 10

Ball bearings are generally made of

(A) Cast iron

(B) Carbon chrome steel

(C) Carbon steel

(D) Malleable cast iron