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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 maximum stress and modulus of elasticity: A composite of glass fibres and epoxy has all of fibres laid along the length and is needed to carry a stress of 12 MPa. T
Future Trends Ceramics and glasses contain wide ranging applications in domestic use and even wider application in manufacturing technology. The properties that are related wit
Find out nature of position vector: The position vector of a specific at any instant t with respect to the axes x, y and z is specified by r (t ) = (4 t 2 + 5) i¯ + (3 t
Necessity of Transmission System The main purpose of Transmission system is to provide a means to vary the torque ratio between the engine and the road wheels. It means th
Helium Helium (He) is an inert, very light monoatomic gas, of atomic weight of 4. It is obtained by separation from natural gas. Helium is refined to a purity of min. 99.99
The open square tube is subjected to the torque T= DEF Nm as shown in Fig Q2. The tube has the length 1m and wall thickness 5mm. a) Calculate the shear stress and angle of
A chemical works produces an aqueous effluent at above ambient temperature. The Environmental Agency insists that before the effluent is discharged to the river, it must be cooled.
Determine the maximum stress: A laminated spring of the quarter elliptic type, 0.6 m long, is to give a static deflection of 80 mm under an end load of 2000 N. If the leaf mat
(i) Formulate the equation of motion for the system shown in Figure. List TWO (2) assumptions made in this formulation. (ii) Find the response of this system at t = 3s. The syst
Q. How to define automatic float operated gauges? In recording type gauges, automatic float operated gauges are more common. The well for the float provides room for installati
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