Q. Suppose there are two reservoirs A and B. Let TA and TB be the temperatures of respective reservoirs. At any instant say TA = TB. In this case maximum temperature occurs at

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Q. The relevant boundary conditions in case of heat transfer from a bar connected to two heat sources at different temperatures are

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Q. “The tube that is used in thermometric well is considered as a hollow fin and the temperature distribution is obtained by using the relation applicable to infinitely long fin”. Choose the correct option

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Q. “The diameter of well does not have any effect on temperature measurement by the thermometer”. Choose the correct option

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Q. Which fin yields the maximum heat flow per unit weight?

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Q. Heat dissipation by every segment of the fin is

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Q. “If a fin of a constant cross section is used, there would be wastage of material”. Chose the correct option.

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Q. Which one is true regarding parabolic fin?

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Q. For parabolic fin, the curve follows which law?

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Q. The correction length for cylindrical fin is
(Where, d is the diameter)

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Q. Provision of fins on a given heat transfer surface will be more effective if there is

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Q. The heat dissipation at any section of parabolic fin is given by

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Q. Which one is true regarding rectangular fin?

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Q. Analysis of heat flow from the finned surface is made with the following assumptions
(i) Uniform heat transfer coefficient, h over the entire fin surface
(ii) No heat generation within the fin generation
(iii) Homogenous material
Identify the correct option

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Q. If heat conducted into the element at plane x is Q X = – k A C (d t/d x) X. Then heat conducted out of the element at plane (x + d x) is

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Q. A heating unit is made in the form of a vertical tube of 50 mm outside diameter and 1.2 m height. The tube is fitted with 20 steel fins of rectangular section with height 40 mm and thickness 2.5 mm. The temperature at the base of fin is 75 degree Celsius, the surrounding air temperature is 20 degree Celsius and the heat transfer coefficient between the fin as well as the tube surface and the surrounding air is 9.5 W/m² K. If thermal conductivity of the fin material is 55 W/m K, find the amount of heat transferred from the tube without fin

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Q. For steady flow of heat along a rod, the general equation is
d²α/dx² – m² α = 0
The value of constant m is

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Q. In convection from the tip, we introduced a factor known as

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Q. Find the value of corrected length for rectangular fin?
Where, b is width and t is length of the fin

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Q. Which one is true for the spine?

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