Question

Which of the following would lead to a reduction in thermal resistance?

a.

In conduction, reduction in the thickness of the material and an increase in thermal conductivity.

b.

In convection, stirring of the fluid and cleaning the heating surface.

c.

In radiation, increasing the temperature and reducing the emissivity.

d.

all of the above

Posted under Mechanical Engineering

Answer: (d).all of the above

Interact with the Community - Share Your Thoughts

Uncertain About the Answer? Seek Clarification Here.

Understand the Explanation? Include it Here.

Q. Which of the following would lead to a reduction in thermal resistance?

Similar Questions

Explore Relevant Multiple Choice Questions (MCQs)

Q. The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number)n, where n is equal to

Q. The curved lines on a psychrometric chart indicates

Q. During humidification process, __________ increases.

Q. A pressure gauge on the discharge side of a refrigerant compressor reads too high. The reasons will be

Q. The counter-current flow heat exchanger can transfer __________ heat than parallel flow heat exchanger.

Q. The freon group of refrigerants are

Q. The centrifugal compressors are generally used for refrigerants that require

Q. The water, alcohol and ammonia have same refrigerating effect at different altitudes.

Q. The automobile radiator is a heat exchanger of

Q. In mechanical refrigeration system, the refrigerant occurs as liquid between condenser and expansion valve.

Q. A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be

Q. For evaporators and condensers, for the given conditions, the logarithmic mean temperature difference (tm) for parallel flow is __________ that for counter flow.

Q. A vapour absorption refrigerator uses __________ as a refrigerant.

Q. Thermal conductivity of air increases with rise in temperature.

Q. The material of pipe lines for a system using ammonia as a refrigerant should be copper.

Q. The wave length corresponding to the maximum energy is inversely proportional to the absolute temperature. This statement is called Planck's law.

Q. The sensible heat gain is due to the __________ difference between the fresh air and the air in space.

Q. During cooling and dehumidification, dry bulb temperature

Q. The coefficient of performance of electrolux refrigerator is the ratio of

Q. The sulphur sticks, in case of leakage of ammonia refrigerant, gives white smoke.

Recommended Subjects

Are you eager to expand your knowledge beyond Mechanical 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!