CHEMICAL ENGINEERING

Question: Copper is not present as an alloying constituent in
[A].

silicon bronze

[B].

constantan

[C].

nichrome

[D].

delta metal

Answer: Option C

Explanation:

No answer description available for this question.

Question: Oxide layer formed on the non-ferrous metal surface after its annealing is
[A].

removed by acid pickling.

[B].

hammered into the surface.

[C].

removed with coarse emery cloth.

[D].

left as such to protect the surface.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Which of the following processes follows the hardening process for reducing the hardening strains & increasing the toughness of the steel part?
[A].

Anodising

[B].

Tempering

[C].

Carburising

[D].

Annealing

Answer: Option B

Explanation:

No answer description available for this question.

Question: Normalising of an object does not
[A].

refine coarse grain structure obtained during hot working.

[B].

improve ductility.

[C].

improve yield strength.

[D].

improve machanical properties.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Annealing of metal does not
[A].

precede its wire drawing.

[B].

induce softness and removes stresses & dissolved gases.

[C].

refine the crystalline structure & produce a definite microstructure.

[D].

alter toughness, ductility and magnetic & electrical or other physical properties.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Pearlite comprises of
[A].

87% cementite & 13% Fe.

[B].

87% ferrite & 13% cementite.

[C].

93.33% ferrite & 6.67% C.

[D].

87% ferrite & 13% C.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Eutectoid reaction for iron-carbon system occurs at a temperature of __________ °C.
[A].

597

[B].

959

[C].

1147

[D].

1493

Answer: Option D

Explanation:

No answer description available for this question.

Question: Eutectic reaction for iron-carbon system occurs at a temperature of __________ °C.
[A].

723

[B].

959

[C].

1147

[D].

1493

Answer: Option A

Explanation:

No answer description available for this question.

Question: Work hardening of a material
[A].

decreases its tensile strength.

[B].

decreases its ductility.

[C].

increases its ductility.

[D].

does not affect its ductility.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Carbon supply in pack carburising process is in the form of
[A].

charcoal

[B].

calcium carbide

[C].

hydrocarbon oil

[D].

graphite

Answer: Option A

Explanation:

No answer description available for this question.