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A four-cylinder, four-stroke spark-ignition engine operates on the ideal Otto cycle with a compression ratio of 11 and a total displacement volume of 1.8 liter. The air is at 90 kPa and 50°C at the beginning of the compression process. The heat input is 1.5 kJ per cycle per cylinder. Accounting for the variation of specific heats of air with temperature, determine
(a) the maximum temperature and pressure that occur during the cycle,
(b) the net work per cycle per cyclinder and the thermal efficiency of the cycle,
(c) the mean effective pressure, and
(d) the power output for an engine speed of 3000 rpm
a piston- cylinder assembly with initial volume of 80 liters contains 4kg of r-134a at a pressure of 160 kpa state 1.
What is the velocity and rate of flow of the metal into the mold? Is the flow turbulent or laminar? (Pure aluminum density ρ = 2.7 g/cm3).
the closed tank is pressurized at 15 psig by air as shown. the liquid is water. determine the velocity of the water
carbon dioxide passing through a heat exchanger at a rate of 100kghr is cooled down from 8000c to 500c. write the
consider a carnot refrigeration cycle with a working fluid of r-134a operating between temperatures of -10oc and 20oc.
What is the maximum allowable pressure if a factor of safety of 4 is to be used and what pressure would a strain of 40 pc indicate?
apple juice at 20c is siphoned from a large tank using a constant-diameter hose. the end of the siphon is 1m below the
What was the stress in the surface layer before it was removed. For aluminum, E = 10 × 106 psi and υ = 0.30.
Manganese has a density of 7.44 g/cm^3. Given that the activation energy for vacancy formation is 1.1 eV/atom, calculate the number of vacancies per cubic meter of Manganese at 1200 degrees C. The atomic weight of manganese is 54.94 amu.
a 200-kg 5-m-wide rectangular gate shown innbspthe figure is hinged at b and leans against thenbspfloor at a making an
you are designing an ex vivo artificial organ. the cells in the organ cannot tolerate shear stress in excess of 0.5 gcm
consider a 15-cell stack hydrogen fuel cell operating steadily in series with 200 cm2 active area per electrode with a
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