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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?
Question: (a) (i) Describe the difference between intrinsic and extrinsic semiconductors. (ii)Is it possible for compound semiconductors to exhibit intrinsic behaviour? Desc
calculate wavelength fpr monocromatic light using newtons ring experiment notes
Determine the shear stress in each section - cells: In Figure, the mean dimensions of the two cells are 100 mm × 50 mm and 50 mm square. t 1 = 3 mm, t 2 = 6 mm,
some suitable examples
Foil Butt Seam Welding This is a modification of seam welding, in which thin narrow strips of metal arc introduced between one or both of the circular electrodes and the work p
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Carburettor Cleaning: Carburettor needs to be cleaned otherwise the jets may get clogged which may supply an inadequate amount of air fuel mixture. Inadequate amount of air fuel
Q. Describe Dry and wet parting materials? Dry parting materials: These are applied by dusting. These include : charcoal, ground bone and limestone, lycopodium(a yellow veget
A load of 2MN is applied on a short concrete column 500 mm x 500 mm. The column is reinforced with four steel bars of 10 mm diameter, one in each corner. Evaluate the stresses in t
Newton law of motion: Secon d Law The rate of change of momentum is proportional to external force applied on the body and take place, in the same direction in which the
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