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79. A steam turbine with 85% stage efficiency receives steam at 7 MPa and 550°C and exhausts at 20 kPa. Determine the turbine work. @ 7 MPa and 550°C: h1 = 3530.9 kJ/kg s1 = 6.9486 kJ/kg-K @ 20 kPa (0.020 MPa): sf = 0.8320 kJ/kg-K hf = 251.40 kJ/kg sfg = 7.0766 kJ/kg-K hfg = 2358.3 kJ/kg A. 1,117 kJ/kg B. 1.132 kJ/kg C. 1,123.34 kJ/kg D. 1,054.95 kJ/kg

79. A steam turbine with 85% stage efficiency receives steam at 7 MPa and 550°C and exhausts at 20 kPa. Determine the turbine work. @ 7 MPa and 550°C: h1 = 3530.9 kJ/kg s1 = 6.9486 kJ/kg-K @ 20 kPa (0.020 MPa): sf = 0.8320 kJ/kg-K hf = 251.40 kJ/kg sfg = 7.0766 kJ/kg-K hfg = 2358.3 kJ/kg A. 1,117 kJ/kg B. 1.132 kJ/kg C. 1,123.34 kJ/kg D. 1,054.95 kJ/kg

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
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79. A steam turbine with 85% stage efficiency receives steam at 7 MPa and 550°C and exhausts at 20 kPa. Determine the turbine work. @ 7 MPa and 550°C: h1 = 3530.9 kJ/kg s1 = 6.9486 kJ/kg-K @ 20 kPa (0.020 MPa): sf = 0.8320 kJ/kg-K hf = 251.40 kJ/kg sfg = 7.0766 kJ/kg-K hfg = 2358.3 kJ/kg A. 1,117 kJ/kg B. 1.132 kJ/kg C. 1,123.34 kJ/kg D. 1,054.95 kJ/kg View Answer: Answer: Option D
Transcribed Image Text:79. A steam turbine with 85% stage efficiency receives steam at 7 MPa and 550°C and exhausts at 20 kPa. Determine the turbine work. @ 7 MPa and 550°C: h1 = 3530.9 kJ/kg s1 = 6.9486 kJ/kg-K @ 20 kPa (0.020 MPa): sf = 0.8320 kJ/kg-K hf = 251.40 kJ/kg sfg = 7.0766 kJ/kg-K hfg = 2358.3 kJ/kg A. 1,117 kJ/kg B. 1.132 kJ/kg C. 1,123.34 kJ/kg D. 1,054.95 kJ/kg View Answer: Answer: Option D
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