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Estimate the concentration (in ppm) and the mass emission rate of NOx (in kg/hr, expressed as NO) if a coal containing 1.5% nitrogen is combusted at 1400 K using an air/fuel ratio that is 1.5 times the stoichiometric ratio. Consider only fuel NOx and assume that only NO is formed. The combustion rate of coal is 600 kg/hr, and the fuel gas (with an average molecular weight of 27.5) is produced at the rate of 13,000 kg/hr.
one mole of an ideal gas at t 25 degc is held in a cylinder by a piston at a pressure of 1 x 107 n m-2. the piston
Steam enters a converging nozzle at 800 kPa and 280 C with negligible velocity. If the expansion is isentropic, what is the minimum pressure that can be reached in such a nozzle and what is the cross-sectional area at the nozzle throat at this pressu..
the wear out of a machine is normally distributed with 90 percent of the failures occurring between 200 and 270 hr of
Motor M draws in the cable with an acceleration of 4 ft/s2, measured relative to the 200-lb mine car. Determine the acceleration of the car and the tension in the cable. Neglect the mass of the pulleys.
Movement of stagnant air over a surface typically decreases the pressure that air exerts on the surface it was in contact with, and higher air velocities usually result in more significant pressure drops. This pressure drop from rapidly moving air ac..
steam with 88.6% quality and a flow rate of 750 kg/s enters a condenser operating @ 75 KPa. Saturated liquid leaves the condenser. How much heat is rejected to the cooling system.
A power plant uses the ranking cycle. the maximum desired temperature in the boiler is 500C. If the turbine is reversible, and the outlet of the turbine (input to condenser) is saturated vapor at p=25kPa,
r-134a is loaded into a weighted pistoncylinder unit. the mass of refrigerant is 10 kg. before heating measurements
dry saturated steam at 7 bar expands reversibly in a cylinder behind a piston until the pressure is 0.1 bar. it heat is
a 230-v shunt motor develops a torque of 40 ib-ft when the armature current is 11 a. find the torque developed when the
a pitot-static tube is used to measure the airspeed of an airplane. the pitot tube is connected to a pressure sensing
The potential energy U of two atoms, a distance r apart, is U= -A/r^m + B/r^n. Show that the condition n > m must be satisfied in the equation for the potential energy U in the above question for the molecule to have a stable position.
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