Heat Dissipation From Extended Surface - 2 - Free MCQ Practice Test

Consider the following statements regarding fin of minimum weight
1. The weight saved by using the triangular fin is 44%.
2. The difference in weight between a fin in shape of circular arc and the fin of triangular shape is very large.
3. The triangular shape fin is regarded as best shape as it is much easier to manufacture.
4. Weight of fin is of paramount importance for the design of cooling device used in aircraft.

Which of the above are correct?

Fin efficiency is defined as the ratio of the heat transferred across the fin surface to the theoretical heat transfer across an equal area held at

Usually fins are provided to increase the rate of heat transfer but fin also acts as insulation which one of the following non-dimensional number decides this factor

The effectiveness of a fin will be maximum in an environment with

Fins are used to increase the heat transfer rate from surface by

Efficiency of a fin with insulated tip is

The insulated tip temperature of a rectangular longitudinal fin having an excess (over ambient root temperature of θ₀) is

A thermocouple in a thermowell measures the temperature of hot gas flowing through the pipe for the most accurate measurement of temperature, the thermowell should be made of

Consider the following statement pertaining to large heat transfer rate using fins
1. Fins should be used on the side where heat transfer coefficient is small
2. Long and thick fins should be used
3. Short and thin fins should be used
4. Thermal conductivity of fin material should be large

Which of the above statements are correct ?

Addition of fin to the surface increases the heat transfer. It