Question

For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally

a.

decreases

b.

increases

c.

remains unchanged

d.

increases exponentially

Answer: (a).decreases

Interact with the Community - Share Your Thoughts

Uncertain About the Answer? Seek Clarification Here.

Understand the Explanation? Include it Here.

Q. For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally

Similar Questions

Explore Relevant Multiple Choice Questions (MCQs)

Q. Mechanical recompression evaporation is used in the production of

Q. A measure of the extent to which viscous heating is important relative to the heat flow resulting from the impressed temperature difference is represented by the __________ number.

Q. Out of 100 kcal/second of incident radiant energy on the surface of a thermally transparent body, 300 kcal/second is reflected back. If the transmissivity of the body is 0.25, the emissivity of the surface will be

Q. The purpose of providing a 'catchall' in the vapor line of an evaporator is to

Q. What is the thermal conductivity of a perfect heat insulator ?

Q. In a single effect evaporator, the economy is

Q. LMTD correction factor which is to be applied for a cross-flow heat exchanger increases with increase in the number of shell passes. Its value for a single pass cross flow heat exchanger is

Q. Which of the following is not concerned with the heat transfer?

Q. Latent heat absorbed by 1 lb of water at 212°F, when it is changed to steam at 212°F, may be around __________ BTU.

Q. In counter flow compared to parallel flow,

Q. The thermal radiative flux from a surface of emissivity = 0.4 is 22.68 kW/m². The approximate surface temperature (K) is (Stefan-Boltzman constant = 5.67x10⁻⁸ W/m².K⁴)

Q. Crystallisation of solids from a homogeneous solution is a/an __________ process.

Q. A multiple effect evaporator has a capacity to process 4000 kg of solid caustic soda per day, when it is concentrating from 10% to 25% solids. The water evaporated in kg per day is

Q. Value of Prandtl number for water ranges from

Q. Heat transfer in the laminar sublayer in case of a liquid flowing through a pipe, is mostly by

Q. In case of a multipass shell and tube heat exchanger, providing a baffle on the shell side __________ the heat transfer rate.

Q. The local surface conductance for laminar film condensation on vertical surface is (where, t = film thickness)

Q. Heat transfer co-efficient (h₁) for liquids increases with

Q. A diathermaneous substance __________ the thermal radiation completely.

Q. A hot body will radiate heat most rapidly, if its surface is

Recommended Subjects

Are you eager to expand your knowledge beyond Basic Chemical Engineering? We've handpicked a range of related categories that you might find intriguing.

Click on the categories below to discover a wealth of MCQs and enrich your understanding of various subjects. Happy exploring!