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Carbon is diffused into steel at 900oC over a period of 10 hrs. The solubility of carbon in steel at this temperature is 1.3%. To start with the steel had 0.15% carbon. Find out at what depth a concentration of 1.0% carbon would be present after this diffusion process? D for diffusion at this temperature in steel is 5.9 x 10 -12 m2/s.
the diagram shows a rigid gate oab which is hinged at o and rests against a rigid nbspsupport at b. calculate the
Consider a supersonic wind tunnel with test section Mach number of 2 and fixed geometry diffuser designed to operate with minimum stagnation pressure losses (smallest diffuser area).
a rigid vessel contains 10 kg of steam. the steam is initially at 10 bar and 300degc. after a period of time the
A huge reservoir of air supplies a converging-diverging nozzle with throat and exit areas of 10 cm^2 and 25 cm^2 respectively. The reservoir pressure and temperature are 150 kPa and 20C. Determine the range of back pressure over which
a tapered structural steel column with a circular cross-section varies linearly from a radius of 25 mm to 15 mm over a
the number of women-years of exposure is less than for established methods and all available evidence should be
a new cast iron pipe is 5 km long and 15 mm diameter is used to convey water at a rate of 0.0150m3s-1. given the
A commercial heat pump has energy in to the system at a rate of 60 kW from a thermal reservoir. If the power input from an electric motor is 15 kW, (a) determine the power (kW) delivered to the office area. (b) Determine the coefficient of perform..
natural gas at 70 f and standard atmospheric pressure of 14.7 psi is compressed isentropically to a new absolute
Air exits from the nozzle at 800m/s. find the air exit temperature from the compressor.
plastics and other polymeric materials are expensive with respect to steel and are usually more costly than aluminum
determine (a) the compression ratio, (b) the cycle efficiency, (c) exhaust temperature, and (d) mean effective pressure (kPa). Draw (e) a P-v diagram and (f) a T-s diagram
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