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ME Set-1
Engineering Materials
81

Engineering Materials MCQ with Answers

81) Killed steels

have minimum impurity level

are produced by L-D process

have almost zero percentage of phosphorus and sulphur

are free from oxygen

Answer is:

are free from oxygen

Explanation:

When steel has been fully deoxidized before casting and no gas was evolved during solidification, the resultant steel is known as killed steel. It is combined with an agent like casting before use. This steel is called "killed" because it quietly solidifies in the mold and no gas evolves.

Engineering Materials MCQ with Answers

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Related Engineering Materials MCQ with Answers

82) An alloy steel which is work hardenable and which is used to make the blades of bulldozers, bucket wheel excavators and other earth moving equipment contain iron, carbon and

chromium

silicon

manganese

magnesium

Answer is:

manganese

83) connecting rod is, usually made from

low carbon steel

high carbon steel

medium carbon steel

high speed steel

Answer is:

medium carbon steel

Explanation:

Connecting rod is, usually, made from Medium carbon steel

84) The alloying element which can replace tungsten in high speed steels is

nickel

vanadium

cobalt

molybdenum

Answer is:

molybdenum

85) Free cutting steels

contain carbon in free form

require minimum cutting force

is used where rapid machining is the prime requirement

can be cut freely

Answer is:

is used where rapid machining is the prime requirement

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