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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?
What is the definition of stall
Question: A 4- pole DC motor is operated as a separately excited motor. When the motor is externally driven at 1800 rpm with rated field current and zero armature current,
Calculate thermal efficiency and compression: Q: Calculate thermal efficiency and compression ratio for automobile working on otto cycle. If energy generated per cycle is t
Yoke or magnetic frame It is the outer cover of the machine. An even number of pole cores are bolted to the yoke. Its serves the following purposes 1. It gives mechanical su
Pole core and pole shoe The pole cores are made of steel laminations that are insulated from each other and riveted together. Every pole core has a pole shoe having a curved su
Is it possible for the steady state temperature profile in a plane wall to be nonlinear at steady state? If yes, provide one example. Solution: Steady state temperature profile
(a) What is a coated tool? What are its advantages? What types of coatings are used in cutting tool. Discuss. (b) Discuss different types of cutting fluids, their properties and
Describe method of deliberately placing column from centre in footing. The method of deliberately placing a column away from the centre of the footing so that resulting soil pr
Internal combustion engine - Thermodynamics: Internal combustion engine is popularly known as I.C. engine, is heat engine that converts the heat energy released by the combust
Q. Design requirements for Aircraft Access? For some remote locations, provision may be required for occasional landing of aircraft during emergencies or executive visits. Thes
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