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A method of reducing (improving) engine fuel consumption and reducing the emissions of NOx in a spark-ignition engine is to run it lean, i.e. with a weak mixture. Discuss the problems encountered when running engines with weak mixtures, and explain how these can be overcome by design of the engine combustion chamber.
Are there any intermetallic compounds present? If so, identify them and determine whether they are stoichiometric or nonstoichiometric.
One and one-half pounds of water within a piston-cylinder assembly execute a Carnot power cycle. During isothermal expansion, the water is heated at 5008F from saturated liquid to saturated vapor. The vapor then expands adiabatically to a temperat..
The properties of the thermocouple jinction are k=35 w/m.k, p=8500 kg/m^3, and cp = 320 J/kg.k. If the heat transfer coefficient between the thermocouple junction and the gas is 250 w/m^2.K, determine the diameter of the junction.
Plot the response. How long does it take for the transient part to die off?
At the instant shown the tensions in the vertical ropes AB and DE are 300N and 200N, respectively. Knowing that the mass of the uniform bar BE is 5kg, determine, at this instant
Compute a formula for the total output possibility set for goods 1 and 2 and draw it when
Determine the rate of heat transfer to the plate, expressing your result in terms of Too, Ts, ro, a, b, and n.
Hydrogen expands isentropically from 15 bar absolute and 340 k to 3 bar absolute in a steady flow process without heat transfer. 1) compute the final velocity if the initial velocity is negligible B) compute the flow rate if the final duct size is 10..
The section of a 4 3 4 group pile in a layered saturated clay is shown in Figure P 9.29. The piles are square in cross section (356 mm 3 356 mm). The center-to-center spacing (d) of the piles is 1 m. Determine the allowable load- bearing capac..
the various combinations of 20° gears that an be used to operate at a center distance of 120 mm with an angular velocity ratio of 3:1. The module is not to be less than 2, and the gears are not to be undercut. The gears are to be hobbed.
What viewpoints should be considered when developing a requirements specification for the MHC-PMS? What are likely to be the most important cross-cutting concerns?
find the diameter given flow rate and pressure what diameter orifice hole d is needed if under ideal conditions the
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