Mechanical Engineering

Question: Hardness of steel is increased by adding sulphur, lead and phosphorus.
[A].

Yes

[B].

No

Answer: Option B

Explanation:

No answer description available for this question.

Question: Corrosion resistance of steel is increased by adding nickel and chromium.
[A].

Agree

[B].

Disagree

Answer: Option A

Explanation:

No answer description available for this question.

Question: Chromium when added to steel __________ the tensile strength.
[A].

does not effect

[B].

decreases

[C].

increases

Answer: Option C

Explanation:

No answer description available for this question.

Question: A small percentage of boron is added to steel in order to
[A].

increase hardenability

[B].

reduce machinability

[C].

increase wear resistance

[D].

increase endurance strength

Answer: Option A

Explanation:

No answer description available for this question.

Question: In high speed steels, manganese is used to tougher the metal and to increase its
[A].

yield point

[B].

critical temperature

[C].

melting point

[D].

hardness

Answer: Option B

Explanation:

No answer description available for this question.

Question: A steel alloy containing 36% nickel is called
[A].

stainless steel

[B].

high speed steel

[C].

invar

[D].

heat resisting steel

Answer: Option C

Explanation:

No answer description available for this question.

Question: A carbon steel having Brinell hardness number 100 should have ultimate tensile strength closer to
[A].

100 N/mm2

[B].

200 N/mm2

[C].

350 N/mm2

[D].

1000 N/mm2

Answer: Option C

Explanation:

No answer description available for this question.

Question: In low carbon steels, presence of small quantities of sulphur improves
[A].

weldability

[B].

formability

[C].

machinability

[D].

hardenability

Answer: Option C

Explanation:

No answer description available for this question.

Question: Which of the following when used in ordinary low carbon steels, makes the metal ductile and of good bending qualities?
[A].

Sulphur

[B].

Phosphorus

[C].

Manganese

[D].

Silicon

Answer: Option C

Explanation:

No answer description available for this question.

Question: In low carbon steels, __________ raises the yield point and improves the resistance to atmospheric corrosion.
[A].

sulphur

[B].

phosphorus

[C].

manganese

[D].

silicon

Answer: Option B

Explanation:

No answer description available for this question.