Thermodynamics Demystified
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4. Calculate the specific volume of water at 221°C if the quality is 85 percent. (A) 0.072 m3/kg (B) 0.074 m3/kg (C) 0.76 m3/kg (D) 0.78 m3/kg 5. Five kilograms of steam occupy a volume of 10 m3. If the temperature is 86°C, the quality and the pressure are nearest (A) 0.76, 60 kPa (B) 0.69, 68 kPa (C) 0.71, 63 kPa (D) 0.72, 61 kPa 6. Water at an initial quality of 50 percent is heated at constant volume from 100 kPa to 200°C. What is P2? (A) 162 kPa (B) 260 kPa (C) 370 kPa (D) 480 kPa 7. Find the quality of steam at 120°C if the vapor occupies 1200 L and the liquid occupies 2 L. (A) 42% (B) 28% (C) 18% (D) 4% 8. Two kilograms of steam are contained in a piston-cylinder arrangement. The 20-mm-diameter 48-kg piston is allowed to rise with no friction until the temperature reaches 260°C. The final volume is nearest (A) 0.13 m3 (B) 0.29 m3 (C) 0.34 m3 (D) 0.39 m3