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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?
Displacement or Swept Volume ( V s ) : The nominal volume swept by the working piston when travelling from one dead centre to the other is called the displacement volume. It is e
Inlet and Exhaust Valves : Valves are commonly mushroom shaped poppet type. They are provided on the cylinder for regulation of the charge coming into the cylinder (inlet valve)
Q. Show Gasket Compression? Gasket compression can also be used as a guide for limiting bolt torque. Spiral wound gaskets should be compressed to an average of 75% of origin
Illustrate the process of knock in C.I engines and compare it with S.I. engine knock. What is Octane rating of C.I. engine fuel. What is the difference between chemical delay and p
A steel rod of 3 cm diameters and 5 m long is connected to two grips and the rod is maintained pull exerted when the temperature falls to 30 o C if (a) The ends do not yield, an
A smooth sphere of radius 15 cm and weight 2 N is supported in contact with a smooth vertical wall by a string whose length simlar the radius of sphere. The string joins a point on
What can a valve do? It can prevent flow (on/off), allow variable control of the flow and provide a safe working environment. What sort of questions should we be asking when selec
What is gear
Q. What is coated electrode? These types of electrodes are prepared by coating of flux on metal wire. Due to arc metal electrode melts and used as filler metal. Flux melts and
where expendable pattern is used?
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