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Derive 3-D non-steady state conduction equation in spherical co-ordinates. Explain the assumption involved.
The hot combustion gases of a furnance are divided from the ambient air and its surroundings, which are at 25 oC, by a brick wall 0.15m thick. The brick has a thermal conductivity of 1.2W/mk and a surface emissivity of 0.8 . Under steady state conditions an outer surface temperature of 100 oC is calculated. Free convention heat transfer to the air adjoining the surface is divided by a convection coefficient of 20W/m2k. what is the brick inner surface temperature?
Determine magnitude of the couple: A square block having each side 1.5 m is acted upon by system of forces along its sides as shown in the adjoining figure. If system reduces
Applications of spot welding As spot welding can be employed for Al, Cu, Ni and Mg alloys. It is not advisable to spot weld steels with carbon content greater than 0.25 % unles
Explain the Effect of Cutting Speed Increase in cutting speed improves the surface finish due to the continuous reduction in built up edge. The curve a represents the machining
Taking Care of Occupational Safety The most important development in occupational safety and health has been the introduction of legislative measures adopted by various gover
Determine the Brake power of an Engine which is running at a fixed speed of 300 r.p.m. and carries a rope brake Dynamometer. The Dead weight on the spring balance and engine readin
Short Circuiting Transfer The short circuiting transfer occurs when the welding current and the arc voltage is low. Metal is transferred from the electrode to the work only wh
Q. What do you mean by Levelling Procedure? The Surveyor shall calculate required field adjustment in module elevation based on data from survey in conjunction with correspondi
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Backup Purge Backup purge gas can also be used to protect the under side of the weld and its adjacent base metal surfaces from oxidation on the time of welding . Uniformity
Cast Iron Electrodes There are three types of electrodes for welding of cast ions. a) Monel-cored electrodes (30 % Ni 70 % Cu) b) Fe-Ni (40 % Ni) c) Ni-electrodes (97 E) These
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