Chemical Engineering Basics

Question: With decrease in the grain size of a material, its creep resistance
[A].

increases.

[B].

decreases.

[C].

remains constant.

[D].

either (a) or (b) ; depends on the material.

Answer: Option C

Explanation:

No answer description available for this question.

Question: In cold working of metal as compared to its hot working
[A].

cracks and blow holes are eliminated.

[B].

ductility and impact strength improves.

[C].

appreciable strain hardening is produced.

[D].

yield stress, hardness and fatigue strength is not at all affected.

Answer: Option D

Explanation:

No answer description available for this question.

Question: Crystallisation of polymers is an undesirable property. Crystallisation of celluloid is prevented by adding
[A].

glycerol

[B].

nitro cellulose

[C].

camphor

[D].

none of these

Answer: Option D

Explanation:

No answer description available for this question.

Question: No cutting fluid is normally used, while machining
[A].

cast iron

[B].

aluminium

[C].

mild steel

[D].

stainless steel

Answer: Option A

Explanation:

No answer description available for this question.

Question: Ceramic materials are
[A].

organic in nature.

[B].

stronger in compression than in tension.

[C].

always amorphous in nature.

[D].

always bad heat conductors.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Heating the hypoeutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called
[A].

tempering

[B].

hardening

[C].

annealing

[D].

normalising

Answer: Option C

Explanation:

No answer description available for this question.

Question: Young’s modulus of elasticity of a material is the slope of the initial linear portion of the stress-strain curve. It decreases ap-preciablyby
[A].

alloying additions

[B].

heat treatment

[C].

cold work

[D].

increasing temperature

Answer: Option B

Explanation:

No answer description available for this question.

Question: In troposphere (the weather domain), the temperature ‘t’ at height ‘h’ above the sea level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)
[A].

t = 15 – 0.0065 h

[B].

t = 15 + 0.0065 h

[C].

t = 0.0035 h – 15

[D].

t = 15 – 0.0035 h

Answer: Option A

Explanation:

No answer description available for this question.

Question: Cold chiesel’s hammers are made of
[A].

high speed steel

[B].

high carbon steel

[C].

forged steel

[D].

mild steel

Answer: Option B

Explanation:

No answer description available for this question.

Question: Addition of __________ to steel does not help in improving its machinability.
[A].

sulphur

[B].

silicon

[C].

lead

[D].

phosphorous

Answer: Option B

Explanation:

No answer description available for this question.