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Midterm Exam 09 solution

# Midterm Exam 09 solution - ME 18b Midterm Exam Due by 5 pm...

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ME 18b, Midterm Exam Due by 5 pm, Tuesday May 5, 2009 ME 18b Midterm Exam Spring 2009 1. Consider a simple ideal Rankine cycle with fixed turbine inlet conditions. What is the effect of lowering the condenser pressure on the following processes? Circle your responses. Pump work input Increases Decreases Remains unchanged Turbine work output Increases Decreases Remains unchanged Heat Supplied Increases Decreases Remains unchanged Heat Rejected Increases Decreases Remains unchanged Cycle efficiency Increases Decreases Remains unchanged Moisture Content at turbine exit Increases Decreases Remains unchanged

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2. A steam power plant operates on the cycle shown below. If the adiabatic efficiency of the turbine is 87% and the pump is 85% determine the thermal efficiency of the cycle and the quality of the steam exiting the turbine. Solution: w pump = v(P 2 P 1 )/ p = 0.001(15 000 7.5)/0.85 = 18 kJ/kg q H = h 3 h 2 = 3582 181 = 3401 kJ/kg w turb = t (h 3 h 4s ) = (h 3 h 4a ) need to find steam quality at turbine exit first. s 3 = s 4 = 6.6775 6.6775 = 0.6492 + x
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