A throttling calorimeter is connected to the superheated steam line supplying steam to the auxiliary feed pump on a ship. The line pressure measures 2.5 Mpa. The calorimeter pressure is 110 kpa and 150 C. Determine the entropy of the steam line. a. 6.8 KJ/kg-K c. 6.6 KJ/kg-K b. 6.2 KJ/kg-"K d. 7.5KJ/kg-"K A superheat steam Rankine cycle has turbine inlet conditions of 17.5 Mpa and 530"C expands in a turbine to 0.007 Mpa. The turbine and pumps polytropic efficiencies are 0.9 and 0.7 respectively, pressure losses between pump and turbine inlet are 1.5 Mpa. What should be the pump work in KJ/kg? a. 17.3 c. 37.3 b. 27.3 d. 43.4 A steam power plant operates on the Rankine cycle. The steam enters the turbine at 7 Mpa and 550'C with a velocity of 30 m/'s. it discharges to the condenser at 20 kpa with a velocity of 90 m/s. Calculate the net work in kw for a flow of 37.8ky's. a. 23.23 Mw c. 34.22 Mw b. 53.34 Mw d. 46.54 Mw Steam enters a turbine at 1.4 Mpa and 320"C. The turbine internal efficiency is 70%, and the total requirement is 800 kw. The exhaust is to the back pressure system, maintains at 175kpa. Find the stean flow rate. a. 2.62 kg/'s c. 3.23 kg/s b. 4.23 kg/s d. 5.34 kg's

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