CHEMICAL ENGINEERING

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.

Question: Glycerene is used as a coolant in cooling of some engines instead of water, because
[A].

its higher boiling point (290°C) increases its heat carrying capacity.

[B].

compartively less weight of coolant is required.

[C].

smaller radiator can be used.

[D].

all a, b & c.

Answer: Option D

Explanation:

No answer description available for this question.

Question: A polymer is termed as an ‘elastomer’, if its percentage elongation is more than 100%. An elastomer is termed as ‘rubber’ if its percentage elongation is more than __________ percent.
[A].

150

[B].

200

[C].

300

[D].

400

Answer: Option B

Explanation:

No answer description available for this question.

Question: An orthotropic material is a special class of anisotropic material, which is described by their properties in three perpendicular directions. An example of orthotropic material is
[A].

stainless steel

[B].

cast iron

[C].

wood

[D].

teflon

Answer: Option C

Explanation:

No answer description available for this question.

Question: Carbide tipped cutting tools are manufactured by powder metallurgy techniques and have a composition of
[A].

90% tungsten carbide and 10% cobalt.

[B].

70% aluminium oxide & 30% silica.

[C].

30% nickel, 15% chromium & 55% tungsten.

[D].

65% tungsten & 35% zirconium.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Mho’s scale of hardness, which consists of 10 standard minerals is used for the measurement of __________ hardness.
[A].

scratch

[B].

indentation

[C].

dynamic

[D].

rebound

Answer: Option A

Explanation:

No answer description available for this question.

Question: Grey cast iron (used for making underground water pipes and manhole covers) as compared to steel has higher
[A].

ductility

[B].

impact strength

[C].

machinability

[D].

melting point

Answer: Option C

Explanation:

No answer description available for this question.