Mechanical Engineering

Question: A steel with 0.8% carbon is known as
[A].

eutectoid steel

[B].

hyper-eutectoid steel

[C].

hypo-eutectiod steel

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Pearlite is a combination of 87% ferrite and 13% cementite.
[A].

Yes

[B].

No

Answer: Option A

Explanation:

No answer description available for this question.

Question: A coarse grained steel
[A].

is less tough and has a greater tendency to distort during heat treatment

[B].

is more ductile and has a less tendency to distort during heat treatment

[C].

is less tough and has a less tendency to distort during heat treatment

[D].

is more ductile and has a greater tendency to distort during heat treatment

Answer: Option A

Explanation:

No answer description available for this question.

Question: A fine grained steel
[A].

is less tough and has a greater tendency to distort during heat treatment

[B].

is more ductile and has a less tendency to distort during heat treatment

[C].

is less tough and has a less tendency to distort during heat treatment

[D].

is more ductile and has a greater tendency to distort during heat treatment

Answer: Option B

Explanation:

No answer description available for this question.

Question: A material is said to be allotropic, if it has
[A].

fixed structure at all temperatures

[B].

atoms distributed in random pattern

[C].

different crystal structures at different temperatures

[D].

any one of the above

Answer: Option C

Explanation:

No answer description available for this question.

Question: Crystal structure of a material is, generally, examined by
[A].

naked eye

[B].

optical microscope

[C].

metallurgical microscope

[D].

X-ray techniques

Answer: Option D

Explanation:

No answer description available for this question.

Question: Micro-structure of a material is, generally, examined by
[A].

naked eye

[B].

optical microscope

[C].

X-ray techniques

[D].

none of these

Answer: Option D

Explanation:

No answer description available for this question.

Question: Macro-structure of a material is, generally, examined by
[A].

naked eye

[B].

optical microscope

[C].

metallurgical microscope

[D].

X-ray techniques

Answer: Option A

Explanation:

No answer description available for this question.

Question: Which of the following statement is true about brittle fracture?
[A].

High temperature and low strain rates favour brittle fracture

[B].

Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture

[C].

Brittle fracture is always preceded by noise

[D].

Cup and cone formation is characteristic for brittle materials

Answer: Option B

Explanation:

No answer description available for this question.

Question: Dye penetrant method is generally used to locate
[A].

core defects

[B].

surface defects

[C].

superficial defects

[D].

temporary defects

Answer: Option B

Explanation:

No answer description available for this question.