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

View solution

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

View solution

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

View solution

Q. Which one is true regarding rectangular fin?

View solution

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

View solution

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

View solution

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

View solution

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

View solution

Q. Which one is true regarding parabolic fin?

View solution

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

View solution

Q. Heat dissipation by every segment of the fin is

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

Q. In thermometric well, the error can be minimized by

(i) The value of parameter ml slows down by some quantity.

(ii) Lagging of the tube so that conduction of heat along its length is arrested

Identify the correct option

View solution

Q. For what purpose we use thermometric well?

View solution

Q. Thermometric well apparatus doesn’t consists of

View solution

Q. The thermometric well is treated as a fin of

View solution