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The top cycle of a combined cycle power plant has a pressure ratio of 12. Air enters the compressor at 300 K at a rate of 12 kg/s and is heated to 1300 K in the combustion chamber. The steam in the bottom cycle is heated to 350°C at 10 MPa in a heat exchanger, and after leaving the turbine is condensed at 10 kPa. The combustion gases leave the heat exchanger at 380 K. Assume that all compression and expansion processes are isentropic. Determine the thermal efficiency of the combined cycle.
the load is being lifted upward at a constant rate of 9 ms relative to the crane boom ab. at the instant shown the boom
consider a cylinder with an inner radius of r1 and an outer radius of r2 and constant thermal conductivity k. heat is
a motorist decreases the speed of an automobile at a constant rate from 45 to 30 mih over a distance of 750 ft along a
in boulder dam 2000 cubic feet per second of water flows through each of the pipes called penstocks that lead down to
it is given that an insulation ki 0.232 wm k is put on a steel pipe 1.6 cm id and 2 cm od. hot water at 90degc flows
compressed air is stored in a pressure bottle with a volume of 10 ft3 at 3000 psia and 140 f. at a certain instant a
consider the 112lt111gt slip system in bcc crystals1. provide a 3d sketch of the plane 112 in a bcc crystal and
what four processes make up the ideal otto cycle? what is happening in an actual engine during the real processes that
In 1975 the roof of Montreal's Velodrome, with a weight of 360 kN, was lifted by 10 cm so that it could be centered. How much work was done on the roof by the forces making the lift?
a hollow cylinder is made by welding two thin disks on either side of a thin ring. it is mounted on a axel and a 2 kg
10 mol of an ideal gas at 5 atm at 298 k is stored in an insulated piston and cylinder arrangement. at these condition
Steam at 1000kPa and 300deg C expands to a pressure of 150kPa in a cylinder. If PV = constant during the process, calculate W, Q and delta S for the process.
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