Chemical Engineering Basics

Question: A furnace is made of a refractory brick wall of thickness 0.5 metre and thermal conductivity 0.7 W/m.°K For the same temperature drop and heat loss, this refractory wall can be replaced by a layer of diatomaceous earth of thermal conductivity 0.14 W/m.K and thickness __________ metre.
[A].

0.01

[B].

0.1

[C].

0.25

[D].

0.5

Answer: Option B

Explanation:

No answer description available for this question.

Question: Percentage of differential pressure lost in a venturimeter with a tapering of 15° may be about
[A].

1

[B].

10

[C].

25

[D].

50

Answer: Option B

Explanation:

No answer description available for this question.

Question: In case of fluid moving machineries, the relationship between saturation temperature and pressure decides the process of
[A].

water hammer

[B].

cavitation

[C].

flow separation

[D].

turbulent mixing

Answer: Option B

Explanation:

No answer description available for this question.

Question: For the Stoke’s law to be valid in the case of a falling sphere in a fluid, the
[A].

Reynolds number (based on sphere diameter) should be < 1.

[B].

flow around the sphere should be in turbulent region.

[C].

sphere must be metallic.

[D].

fluid density should be constant.

Answer: Option C

Explanation:

No answer description available for this question.

Question: In case of a, centrifugal pump, the ratio h1/h2 is termed as the __________ efficiency (where, h1 = actual measured head & h2 = head imparted to the fluid by impeller).
[A].

mechanical

[B].

overall

[C].

volumetric

[D].

impeller

Answer: Option A

Explanation:

No answer description available for this question.

Question: Good design of the casing of a centrifugal pump aims at minimising the
[A].

cavitation

[B].

frictional losses

[C].

kinetic energy loss

[D].

static head

Answer: Option C

Explanation:

No answer description available for this question.

Question: Friction factor for fluid flow in pipe does not depend upon the
[A].

pipe length.

[B].

pipe roughness.

[C].

fluid density & viscosity.

[D].

mass flow rate of fluid.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Internal energy of a gas obeying Vanderwall’s equation of state, , depends upon its
[A].

pressure & temperature.

[B].

pressure & specific volume.

[C].

temperature & specific volume.

[D].

temperature only.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Joule-Thomson co-efficient is the ratio of
[A].

pressure change to temperature change occuring during adiabatic compression of a gas.

[B].

pressure change to temperature change occuring during adiabatic throttling of a gas.

[C].

temperature change to pressure change occuring during adiabatic compression of a gas.

[D].

temperature change to pressure change occuring during adiabatic throttling of a gas.

Answer: Option D

Explanation:

No answer description available for this question.

Question: Increase in the entropy of a system represents the
[A].

degradation of energy.

[B].

decrease in system pressure.

[C].

increase in the availability of energy.

[D].

increase in the temperature.

Answer: Option A

Explanation:

No answer description available for this question.