CHEMICAL ENGINEERING

Question: Damage to metal surface by mechanical action is called
[A].

pitting

[B].

corrosion

[C].

erosion

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: Out of the following, the dimensionless quantity is
[A].

specific weight

[B].

viscosity

[C].

Mach number

[D].

density

Answer: Option C

Explanation:

No answer description available for this question.

Question: __________ is the most important element, which controls the physical properties of steel.
[A].

Manganese

[B].

Silicon

[C].

Carbon

[D].

Vanadium

Answer: Option C

Explanation:

No answer description available for this question.

Question: Austenite is not
[A].

ductile

[B].

malleable

[C].

magnetic

[D].

soft

Answer: Option C

Explanation:

No answer description available for this question.

Question: For the running of power generating turbines, the steam used should be
[A].

wet

[B].

superheated

[C].

at ordinary pressure

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: Closeness of packing is maximum in case of __________ crystal lattice.
[A].

face centred

[B].

simple cubic

[C].

body centred

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

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.