WorksheetsFinal Exam in ME 313 - Part 2B.1 - Problems
Total questions: 13
Worksheet time: 45mins
Which of the following will best describe water at 200 deg C with pressure of 1.40 MPa?
Wet Steam
Superheated
Dry Steam
Subcooled water
Which of the following will best describe water at 1 MPa and h = 2800.5 kJ/kg?
Wet Steam
Superheated
Dry Steam
Subcooled water
Which of the following will best describe water at 75006.17 mmHg and u = 1306 kJ/kg?
Wet Steam
Superheated
Dry Steam
Subcooled water
Which of the following best describes water at 3 MPa and 234 °C, with a quality greater than 0 but less than 1.0?
Wet Steam
Superheated
Dry Steam
Subcooled water
Find the enthalpy at 100 psi and 97% quality, hf = 298.55 Btu/lb; hfg = 889.119 Btu/lb.
1,170 Btu/lb
1,161 Btu/lb
1,734 Btu/lb
1,803 Btu/lb
180 grams of saturated water of temperature 95°C undergoes evaporation process until all vapor completely vaporized. Determine the changed in volume. At 95°C: vf = 0.0010397 m3/kg, Vg = 1.9819 m3/kg
0.1656 m3
0.4235 m3
0.2565 m3
0.3565 m3
Five kilograms of saturated liquid at 120 kPa is heated until its moisture content is 5%. Find the work done for this process.
813.59 kJ/kg
643.23 kJ/kg
542.34 kJ/kg
753.12 kJ/kg
Steam enters the superheaters of a boiler at a pressure of 25 bar and dryness. of 0.98 and leaves at the same pressure at a temperature of 370 °C. Calculate the heat energy supplied in the superheaters. Properties of steam: At 25 bar and 370°C (h = 3171.8 kJ/kg) and at 25 bar and 0.98 dryness (hf = 962.11 kJ/kg, hfg = 1841.01 kJ/kg).
407.46
408.57
405.51
406.54
Steam enters a throttling calorimeter at a pressure of 1.03 Mpa. The calorimeter downstream pressure and temperature are respectively 0.100 Mpa and 125 °C. What is the percentage moisture of the supply steam?
Properties of Steam: P = 1.03 Mpa: hg = 2779.25 kJ/kg, hfg = 2010.7 kJ/kg; At 0.100 Mpa and 125 °C: h = 2726.6 kJ/kg
2.62
5.21
3.15
1.98
A steam power plant is to operate on a Rankine cycle with a condenser outlet temperature of 40 °C and boiler outlet temperature of 600 °C. Find the efficiency of a Carnot engine operating between the same temperature limits. Neglecting pump work. At 600 °C & 2.5 MPa: h = 3686.8 kJ/kg, s = 7.5978 kJ/kg-K; At 40 °C: hf = 166.9 kJ/kg, hfg - 2406.37 kJ/kg, sf,= 0.57kJ/kg-K, sfg = 7.688 0.57kJ/kg-K
36.2%
37.5%
61.5%
64.1%
A steam power plant is to operate on a Rankine cycle with a condenser outlet temperature of 40 °C and boiler outlet temperature of 600 °C. If the pump outlet pressure is 2.5 MPa, find the thermal efficiency of the cycle. Neglecting pump work. At 600 °C & 2.5 MPa: h = 3686.8 kJ/kg, s = 7.5978 kJ/kg-K; At 40 °C: hf = 166.9 kJ/kg, hfg - 2406.37 kJ/kg, sf,= 0.57kJ/kg-K, sfg = 7.688 0.57kJ/kg-K
36.2%
37.5%
61.5%
64.1%
Find the degrees superheat of steam at 320°C and 8.58 MPa.
10°C
15°C
20°C
20°C
Find the degrees subcooled of liquid water at 50°C and 19.94 kPa.
10°C
15°C
20°C
20°C
