Q: Repeat Prob. 2–81 for a pressure gage reading of
Repeat Prob. 2–81 for a pressure gage reading of 180 kPa. Data from Prob 2-81: A gasoline line is connected to a pressure gage through a double-U manometer, as shown in Fig. P2&acir...
See AnswerQ: Three kg of helium gas at 100 kPa and 27°C
Three kg of helium gas at 100 kPa and 27°C are adiabatically compressed to 900 kPa. If the isentropic compression efficiency is 80 percent, determine the required work input and the final temperature...
See AnswerQ: Steam at 6000 kPa and 500°C enters a steady-
Steam at 6000 kPa and 500°C enters a steady-flow turbine. The steam expands in the turbine while doing work until the pressure is 1000 kPa. When the pressure is 1000 kPa, 10 percent of the steam is re...
See AnswerQ: Refrigerant-134a at 140 kPa and –10°C is
Refrigerant-134a at 140 kPa and –10°C is compressed by an adiabatic 1.3-kW compressor to an exit state of 700 kPa and 60°C. Neglecting the changes in kinetic and potential energies, determine (a) the...
See AnswerQ: Refrigerant-134a enters a compressor as a saturated vapor at 160
Refrigerant-134a enters a compressor as a saturated vapor at 160 kPa at a rate of 0.03 m3/s and leaves at 800 kPa. The power input to the compressor is 10 kW. If the surroundings at 20°C experience an...
See AnswerQ: Air is expanded in an adiabatic turbine of 90 percent isentropic efficiency
Air is expanded in an adiabatic turbine of 90 percent isentropic efficiency from an inlet state of 2800 kPa and 400°C to an outlet pressure of 100 kPa. Calculate the outlet temperature of air, the wor...
See AnswerQ: A steam turbine is equipped to bleed 6 percent of the inlet
A steam turbine is equipped to bleed 6 percent of the inlet steam for feedwater heating. It is operated with 4 MPa and 350°C steam at the inlet, a bleed pressure of 800 kPa, and an exhaust pressure of...
See AnswerQ: Heat in the amount of 100 kJ is transferred directly from a
Heat in the amount of 100 kJ is transferred directly from a hot reservoir at 1200 K to a cold reservoir at 600 K. Calculate the entropy change of the two reservoirs and determine if the increase of en...
See AnswerQ: Two rigid tanks are connected by a valve. Tank A is
Two rigid tanks are connected by a valve. Tank A is insulated and contains 0.3 m3 of steam at 400 kPa and 60 percent quality. Tank B is uninsulated and contains 2 kg of steam at 200 kPa and 250Â...
See AnswerQ: A 1200-W electric resistance heating element whose diameter is 0
A 1200-W electric resistance heating element whose diameter is 0.5 cm is immersed in 40 kg of water initially at 20°C. Assuming the water container is well insulated, determine how long it will take f...
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