CHEMICAL ENGINEERING

Question: Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m2 .k), when the insulation thickness is __________ mm.
[A].

15

[B].

25

[C].

10

[D].

30

Answer: Option B

Explanation:

No answer description available for this question.

Question: In case of water (Prandtl number ≈ 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is
[A].

less

[B].

more

[C].

equal

[D].

unpredictable

Answer: Option A

Explanation:

No answer description available for this question.

Question: In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that
[A].

compared to the mass flow rate of cooling water, the rate of condensation of steam is invariably smaller.

[B].

maintaining vacuum on tube side is more difficult than that on the shell side.

[C].

water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam.

[D].

condenser can act as a storage unit for condensed steam.

Answer: Option C

Explanation:

No answer description available for this question.

Question: In radiative heat transfer, a grey surface is the one, which has
[A].

emissivity independent of wavelength.

[B].

grey appearance to the eye.

[C].

zero reflectivity.

[D].

equal brightness in all directions.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Out of the following, maximum temperature drop for a given heat flow & for the same thickness will be in the case of
[A].

steel

[B].

glass wood

[C].

copper

[D].

fireclay bricks

Answer: Option B

Explanation:

No answer description available for this question.

Question: Gage pressure within a spherical droplet of a fluid is ‘p’. What will be gage pressure within a bubble of the same size & of the same fluid ?
[A].

p

[B].

2 p

[C].

0.5 p

[D].

0.25 p

Answer: Option B

Explanation:

No answer description available for this question.

Question: A fluid is termed as the Newtonion fluid, when the shear stress is __________ the velocity gradient.
[A].

independent of

[B].

inversely proportional to

[C].

directly proportional to

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: Existence of velocity potential implies that the fluid is
[A].

irrotational

[B].

ideal

[C].

compressible

[D].

in continuum

Answer: Option A

Explanation:

No answer description available for this question.

Question: Current asset of a factory includes the
[A].

goodwill of the company.

[B].

common stocks held by the company.

[C].

manufacturing plant & equipment.

[D].

inventory.

Answer: Option C

Explanation:

No answer description available for this question.

Question: __________ method of depreciation calculation ensures that the interest is charged on the cost of machine asset every year on the book value, but the rate of depreciation remains constant every year.
[A].

Annuity charging

[B].

Atraight line

[C].

Ainking fund

[D].

None of these

Answer: Option B

Explanation:

No answer description available for this question.