Chemical Engineering Basics

Question: Heat treatment of steel is done mainly to change its
[A].

mechanical properties.

[B].

physical properties,

[C].

chemical composition.

[D].

all ‘a’, ‘b’ & ‘c’.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Eutectoid composition of carbon steel at room temperature is
[A].

cementite

[B].

pearlite

[C].

martensite

[D].

ferrite

Answer: Option B

Explanation:

No answer description available for this question.

Question: Overheating of satellites during re-entry to earth is controlled by
[A].

thick insulation.

[B].

ceramic lining.

[C].

cooling by flow of air over the surface.

[D].

none of these.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Cold chiesel & 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: Brittleness induced due to the presence of sulphur in steel can be reduced by adding
[A].

manganese

[B].

magnesium

[C].

vanadium

[D].

copper

Answer: Option A

Explanation:

No answer description available for this question.

Question: Out of the following, the best material capable of withstanding shock & vibration without the danger of cracking is
[A].

malleable iron

[B].

grey cast iron

[C].

chilled cast iron

[D].

white cast iron

Answer: Option A

Explanation:

No answer description available for this question.

Question: Energy of the sun arises mainly from __________ reactions.
[A].

fusion

[B].

fission

[C].

combustion

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Cast iron has the unique property of high
[A].

ductility

[B].

damping characteristics

[C].

hardness

[D].

malleability

Answer: Option B

Explanation:

No answer description available for this question.

Question: Machinability of hard alloys & tool steels is improved by
[A].

spherodising

[B].

annealing

[C].

tempering

[D].

normalising

Answer: Option B

Explanation:

No answer description available for this question.

Question: Multistage compression is necessary for high efficiency,
[A].

if the ratio of the delivery pressure to the intake pressure exceeds 5:1.

[B].

when large amount of gas is to be compressed.

[C].

when the delivered gas is desired at very high velocity.

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.