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Engineering
Mechanical
ME Set-1
Engineering Materials
69

Engineering Materials MCQ with Answers

69) A small percentage of boron is added to steel in order to

increase hardenability

reduce machinability

increase wear resistance

increase endurance strength

Answer is:

increase hardenability

Explanation:

A small percentage of boron is added to steel in order to Increase hardenability.

Engineering Materials MCQ with Answers

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Related Engineering Materials MCQ with Answers

70) Which of the following material has nearly zero coefficient of expansion?

Stainless steel

high speed steel

Invar

Heat resisting steel

Answer is:

Invar

71) chromium when added to steel______the tensile strength.

does not affect

decreases

increases

may increase or decrease

Answer is:

increases

Explanation:

Chromium when added to steel to Increases the tensile strength.

72) Vanadium when added to steel

increases tensile strength

decreases tensile strength

raises critical temperature

lower critical temperature

Answer is:

increases tensile strength

73) Tungsten when added to steel ______ the critical temperature.

does not affect

lowers

raises

my raises or lowers

Answer is:

raises

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