CHEMICAL ENGINEERING

Question: Draft allowance given to patterns is for
[A].

compensating the liquid state shrinkage.

[B].

easy removal of pattern from the mold cavity.

[C].

providing support for the core placement.

[D].

compensating the solidification shrinkage.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Identify the false statement
[A].

Martensitic steels are less susceptible to pitting corrosion than austenitic steels.

[B].

Pitting corrosion is usually very localised.

[C].

Hydrogen embrittlement is facilitated by tensile stress.

[D].

Stress corrosion cracking is facilitated by tensile stress.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Blast furnace is a
[A].

counter current reactor

[B].

co-current reactor

[C].

cross-current reactor

[D].

combination of all the three

Answer: Option A

Explanation:

No answer description available for this question.

Question: During decarburising of a plain carbon steel, the thickness of ferrite layer growth is proportional to
[A].

time

[B].

square root of time

[C].

square of time

[D].

cube of time

Answer: Option B

Explanation:

No answer description available for this question.

Question: Coating of zinc over steel is known as
[A].

cladding

[B].

galvanising

[C].

anodising

[D].

passivation

Answer: Option B

Explanation:

No answer description available for this question.

Question: In a furnace with heating element temperature at 1700°C, the dominant machanism of heat transfer will be
[A].

conduction

[B].

radiation

[C].

natural convection

[D].

forced convection

Answer: Option B

Explanation:

No answer description available for this question.

Question: An ingot is hot forged to a 60% reduction in cross-section area. The percentage reduction in the volume for the above process is
[A].

0

[B].

60

[C].

30

[D].

20

Answer: Option A

Explanation:

No answer description available for this question.

Question: M10 index of coke indicates its
[A].

compressive strength.

[B].

hardness.

[C].

abrasion resistance.

[D].

impact strength.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Lap joints are preferred over butt joints in soldering/brazing, because these joints are
[A].

weaker in tension but stronger in shear.

[B].

weaker in shear but stronger in tension.

[C].

stronger in both shear and tension.

[D].

The lap joints are easily made.

Answer: Option D

Explanation:

No answer description available for this question.

Question: Lead is added to 60:40 brass primarily to improve
[A].

machinability

[B].

corrosion resistance

[C].

fluidity

[D].

strength

Answer: Option A

Explanation:

No answer description available for this question.