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Refrigerant 134a at -10°C, 1.4 bar and a mass flow rate of 280 kg/hr enters an insulated compressor operating at steady state and exits at 9 bar. The isentropic compressor efficiency is 82%. Determine (a) the exergetic effectiveness and (b) the exergy destroyed. The surrounds can be taken to be To= 20°C, Po = 100 kPa.
refrigerant gas r-134 at 500k and 70 degrees c enters an air-cooled condenser heat exchanger and leaves the condenser
one kilogram of water contained in a piston-cylinder assembly initially at 160oc 150 kpa undergoes an isothermal
a vehicle traveling at 30 mph enters a 600 ft radius curve and begins to increase its speed at a rate of 10 fts2. find
Horsepower and efficiency of three-phase motor, If a fully loaded 440V, three-phase motor draws 12.4 A at 86% power factor (pf). It's speed is 1730 rpm and its torque output to a mechanical load is 29.1 lb-ft x 1.356 = 39.5 Nm.
a a team of astrononers have proposed to construct a large parabolic telescope mirror by spinning a cylindrical
determine the largest intesity w0 of the distributed load that the beam can support if the beam can withstand a maximum
an fcc iron-carbon alloy initially containing .2 wt carbon is carburized at an elevated temperature and in an
providing domestic hot water to a household typically requires 107 kj of energy per year. a typical electric water
a balloon filled with helium gas is to be used to lift a military vehicle that weighs 2570 pounds. as learned in class
three resistors connected in series have resistance values in the ratio 11.53.3 and combine to an equivalent resistance
the boat is to be pulled onto shore using two ropes. If the resultant force is to be 1000 N, directed along the keel aa , determine the magnitude of forces T, P acting in each rope at the angle teta of P so that the magnitude of P is minimum. T ac..
A steel tape is used to measure a distance of 20 m at a 10 0C. Assuming that the tape will measure the true distance when the temperature is 20 0C. What would be the indicated distance at 10 0C? What would be the indicated distance at 400C?
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