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6. Two vessels, A and B each of volume 4m3 are connected by a tube of negligible volume. Vessel
A contains air at 0.8MPa, 1050C, while vessel B contains air at 0.45MPa, 2250C. When A is allowed
to mix with B and assuming the mixing to be complete and adiabatic, determine (a) the final
pressure and temperature of air after mixing, (b) the amount of entropy generation and (c) the
irreversibilities in the process. Take, T0=300C
Two vessels, A and B each of volume 4m3 are connected by a tube of negligible volume. Vessel
A contains air at 0.8MPa, 1050C, while vessel B contains air at 0.45MPa, 2250C. When A is allowed
to mix with B and assuming the mixing to be complete and adiabatic, determine (a) the final
pressure and temperature of air after mixing, (b) the amount of entropy generation and (c) the
irreversibilities in the process. Take, T0=300C
Consider a steam power plant operating on the simple Rankine cycle. Steam enters the turbine
at 16 MPa and 600°C and is condensed in the condenser at a pressure of 8 kPa. Considering an
isentropic efficiency of 85% for both the turbine and pump, determine (a) the net work produced
in the cycle, (b) the heat input in the boiler, (c) the heat rejection in condenser and (d)the thermal
efficiency of this power plant.
A gas-turbine power plant operating on a simple Brayton cycle has a pressure ratio of 12. The
gas temperature is 300 K at the compressor inlet and 1500 K at the turbine inlet. Assuming a
compressor efficiency of 80 percent and a turbine efficiency of 85 percent, determine (a) the gas
temperature at the exits of the compressor and the turbine, (b) the back-work ratio, and (c) the
thermal efficiency of the cycle.
Figure out the specific volume, specific enthalpy and specific internal energy of wet steam at 15 bar with a dryness fraction of 0.9.
1 m3 of air at 8 bar and 120 oC is cooled at constant pressure process until the temperature drops to 27 oC. Given R = 0.287 kJ/kgK and Cp = 1.005 kJ/kgK, calculate the heat rejected during the process and the volume of the air after cooling.
The beam shown in Figure P2 is a simply supported beam with a rectangular
cross-section.
A. a. Draw the free body diagram for the beam.
B. b. Calculate all the reaction forces at the supports.
C. c. Draw the shearing force diagram for the beam on a graph sheet.
D. d. Draw the bending moment diagram for the beam on a graph sheet.
E. e. What is the maximum normal stress in the beam?
A solid circular steel shaft is designed as shown in Figure P1. It consists of two
segments: AB has a diameter of 35 mm and BC has a diameter of 55 mm. If the
lengths of the sections AB and BC are 25 cm and 30 cm respectively and the
modulus of rigidity of steel is 77.2 GPa,
A. Draw the free body diagrams of the rod segments AB and BC.
B. Find the torques TAB and TBC of the sections AB and BC respectively.
C. Find the shearing stress in section AB.
D. Find the angle of twist of section AB.
E. Find the angle of twist of section BC.
F. Find the angle of twist of the point A relative to point C, leaving your answer
An air and water vapour mixture at 1 bar and 26.7oC has a specific humidity of 0.0085. Determine the
percentage saturation.
Atmospheric air at a pressure of 760 mm Hg has a temperature of 32oC and a percentage saturation as
determined from a psychrometric chart of 52%. Calculate
(i) The partial pressure of the vapour and the dry air
(ii) The specific humidity
(iii) The dew point
(iv) The density of the mixture.
