Engineering Materials | Mechanical Engineering

Hardness of steel is increased by adding sulphur, lead and phosphorus.

Byadmin September 14, 2022

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

Yes

[B].

Answer: Option B

Explanation:

No answer description available for this question.

Engineering Materials

Recrystallization temperature is one________________?

Recrystallization temperature is one________________?

A. at which crystals first start forming from molten metal when it is cooled
B. at which new spherical crystals first begin to form from the old deformed one when a strained metal is heated
C. at which change of allotropic form takes place
D. at which crystals grow bigger in size
E. at which crystals are destroyed on heating

Read More Recrystallization temperature is one________________?
Engineering Materials | Mechanical Engineering

In normalising process, the hypo-eutectiod steel is heated from 30° C to 50° C above the upper critical temperature and then cooled in still air.

Question: In normalising process, the hypo-eutectiod steel is heated from 30° C to 50° C above the upper critical temperature and then cooled in still air.
[A].

True
[B].
False

Answer: Option A

Explanation:

No answer description available for this question.

Read More In normalising process, the hypo-eutectiod steel is heated from 30° C to 50° C above the upper critical temperature and then cooled in still air.
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

In aqua-ammonia and Lithium-bromide water absorption refrigeration systems, the refrigerants are respectively

Question: In aqua-ammonia and Lithium-bromide water absorption refrigeration systems, the refrigerants are respectively
[A].

water and water
[B].
water and lithium bromide
[C].
ammonia and lithium bromide
[D].
ammonia and water

Answer: Option D

Explanation:

No answer description available for this question.

Read More In aqua-ammonia and Lithium-bromide water absorption refrigeration systems, the refrigerants are respectively
Engineering Materials

Which of the following is used for bearing liner_______________?

Which of the following is used for bearing liner_______________?

A. gun metal
B. bronze
C. bell metal
D. babbit metal
E. brass

Read More Which of the following is used for bearing liner_______________?
Heat Transfer | Mechanical Engineering | Refrigeration and Air Conditioning

If a gas is to be liquified, its temperature must be

Question: If a gas is to be liquified, its temperature must be
[A].

increased to a value above its critical temperature
[B].
reduced to a value below its critical temperature
[C].
equal to critical temperature
[D].
none of the above

Answer: Option C

Explanation:

No answer description available for this question.

Read More If a gas is to be liquified, its temperature must be
Ic Engines And Nuclear Power Plants | Mechanical Engineering

A mixture containing 65% of iso-octane and 35% of normal heptane will have

Question: A mixture containing 65% of iso-octane and 35% of normal heptane will have
[A].

cetane number 65
[B].
octane number 65
[C].
qetane number 35
[D].
octane number 35

Answer: Option B

Explanation:

No answer description available for this question.

Read More A mixture containing 65% of iso-octane and 35% of normal heptane will have

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