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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?
Describe the key terms i. Write two differences between boiler and turbine. ii. Compare the rankine cycle with carnot cycle in terms of efficiency and work ratio iii.
Control Surface and Flow Work - thermodynamics: Cont r o l Surface: A control system has control volume that is separated from its surrounding by real or imaginary contro
Convert the following readings of pressure to KPa absolute, assuming that the barometer reads 760mm Hg: (a) 100 psig, (b) 8in. Hg vacuum, and (c) 76in Hg gage.
type the indexing mechanism of jigs and fixture
Explain the End Cutting Edge Angle It is an angle between the face of the tool and the plane perpendicular to side of shank. It acts as relief angle that is allows only small s
Q. Show General Properties of Castings? 1. Fe-Cr (10-30%Cr) alloys offer good resistance to oxidation, low strength at elevated temps, restricted to use in oxidizing or reducin
Applications. The welding process finds widespread applications in almost all branches of industry and construction. fabrication and creation of steel structures
Gas Lenses Gas lenses are used to provide a laminar flow of shielding gas. All These attachments have a porous barrier diffuser and are fitted around the electrode or collet
Brake Wear Inspection and Free Play Adjustment: Brake wear inspection is very important because worn out brake shoe does not provide good braking. At some point of time they need
(a) Why do we change the engine oil at periodic intervals? (b) What are the recommended instructions to change engine oil? (c) How will you measure the engine oil level?
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