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100 kmol/h of biogas (75 mol% CH4 and 25 mol% CO2) is produced in a digester and is drawn off from the headspace under a slight vacuum and piped to a natural gas burning boiler. A slight leak develops in the pipe allowing air (79 mol% N2 and 21 mol% O2) to enter and mix with the biogas. Biogas becomes flammable if the oxygen content exceeds 5 mol% in the mixture. Determine the maximum size the leak can be (in kmol/hr) before a safety hazard develops?
in a pharmaceutical plant a copper pipe kc 400 wm.k with inner diameter of 20 mm and wall thickness of 2.5 mm is used
brass balls each of mass 0.258 kg and initially at 130degc are quenched in a water bath at 50degc for 2 minutes at a
funky fredy weights 1000 lbs. being too large to fit through door he must be hoisted from a platform to the second
hot oil cp2.3 kjkg.c at a rate of 2.5 kgs enters an adiabatic exchanger at 180 c and leaves at 150 c. cooling water
describe external threading operations. explain the external threading operation in details. why is it important to
A flat plate having an area of 10 m^2 and a temperature of 327 C is exposed to air at 27 C. the convective heat transfer coefficient is 15 W/m^3.C and the emissivity of the plate is 0.80.
Sketch the frequency response of the system. Overlay the frequency spectrum of the excitation and as you start the system up, increasing Ω from 0 to 60 rpm, what speeds are most likely to excite large amplitude response? Why?
1. what does the area-velocity relationship tell us about flow in a supersonic wind tunnel?2. what is the throat and
an aircraft flying at 10000 feet uses a pitot-static tube to measure speed. the instrumentation on the aircraft
water in a piston-cylinder assembly with an initial volume of 0.01m3 has an initial temperature of 120c and an initial
The motion of a particle in defined by the relation x = t3 - 15 t2 - 20, where ‘x' is expressed in metres and ‘t' in seconds. Determine the acceleration of the particle at t = 3 seconds.
Steam condenses in a 2cm I.D. thin walled tube of 99% aluminium at 10atm pressure. There are circular fins of constant thickness, 3.5cm in diameter, and every 0.5 cm on the outside. The fins are 0.8mm thick and the heat transfer coefficient from them..
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