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A hydrogen/oxygen fuel cell operates with a voltage of 0.7 V with water vapor production. Calculate the kW/h of work per kg-mol of hydrogen and determine the cell efficiency.
a compressed air cylinder initially contains air at 25ordmc and 100 kpa. the volume of the cylinder is 0.01021 m3. the
assume that the heat treatment supervisor in charge of processing the some gears is on an economy program directed
air in a piston-cylinder assembly undergoes a process from state 1 where t1 300 k p1 100 kpa to state 2 where t2500 k
steam enters a urbine at 25 mpa 550c and exits at 5 mpa 325c at a flow rate of 70 kgs. determine the total power output
a heat pump has a coefficient of performance of 2 using a power input of 2 kw. its low temperature is to and the high
Taking the temperature of the surrounding surfaces to be 20°C also, determine the rate of heat loss from the steam pipe.
a dump truck is shown in the figure. the loaded container has a mass of 8000 kg and may be modelled as a solid
obtain the continuity equation in cylindrical coordinates by expanding the vector form in cylindrical coordinates. to
A counter-flow double pipe heat exchanger is heat water from 20 degrees Celsius to 80 degrees Celsius at the rate of 1.2 kg/s. The heating is to be accomplished by geothermal water available at 160 degrees Celsius at a mass flow rate of 2 kg/s.
Compute a stationary spot price equilibrium, (x0 , x1, P , r , G, T), with r = P = 1. Check that tax payments equal the interest on the government debt.
A pressure cooker has a volume of 5 L and an operating temperature of 120 C. Initially, 99% of the mass is filled with liquid water and the rest with vapor. Heat is supplied at a rate of 1.5 kW.
If a Germanium wafer, which is uniformly doped with Gallium to a concentration of 5.55? 10^23 (m^3)^-1, has an electrical conductivity of 17,000 (?m)^-1 determine the mobility of the charge carriers in (m^2 / (V sec)). (Recall each gallium atom will ..
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