Chemical Engineering Basics

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.

Question: Hardening of steel is not possible, unless it is heated __________ critical point.
[A].

above the highest

[B].

above the lowest

[C].

between the first & second

[D].

between the second & third

Answer: Option B

Explanation:

No answer description available for this question.

Question: Nitriding of steel is a process for
[A].

case hardening

[B].

spheroidising

[C].

normalising

[D].

annealing

Answer: Option A

Explanation:

No answer description available for this question.

Question: Austempering of steel requires.it to be heated to 875°C followed by sudden cooling to 250-525°C, thereby changing austenite to
[A].

sorbite

[B].

bainite

[C].

martensite

[D].

troostite

Answer: Option B

Explanation:

No answer description available for this question.

Question: __________ is not a heat treatment process.
[A].

Cyaniding

[B].

Pakerising

[C].

Austempering

[D].

Martempering

Answer: Option B

Explanation:

No answer description available for this question.