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Chapter 3 solution

# Chapter 3 solution - ME 113 Homework Set 3 Due Feb 15 Show...

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ME 113 Homework Set 3 Due Feb 15. Show your work for the calculation problems. Question 1 At a pressure of 4 Mpa, the temperature at which liquid water boils is: A) 29.0°C B) 100.0°C C) 143.6°C D) 250.4°C Answer d is the correct answer. According to the property tables for water, the saturation temperature for a pressure of 4 Mpa is 250.4°C. Question 2 Which state on this phase diagram is the critical state? A) A B) B C) C D) D Answer c is the correct answer. The point where the liquid-vapor line terminates (Point C) is the critical state by definition. Question 3 In which region of the property diagram below are liquid-vapor mixture states located? A) A B) B C) C D) D

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Answer c is the correct answer. The region (region C) located between the pure liquid (region B) and pure vapor (region D) regions is the liquid-vapor mixture region. Question 4 The specific volume of a system consisting of refrigerant-134a at 1.0 Mpa is 0.01 m 3 /kg. The quality of the R-134a is: A) 12.6 % B) 47.2 % C) 68.3 % D) Not applicable Feedback: Answer b is the correct answer. The fraction of the vapor portion of a liquid-vapor mixture is given by: x = (v - vf) / vfg = (0.01 - 0.00087) / (0.0202 - 0.00087) = 47.2 %. Question 5 A system contains water at 2.00 MPa, 220°C. The phase of this water is: A) Liquid B) Liquid-vapor mixture C) Vapor D) Solid Answer c is the correct answer. The saturation temperature for water at 2.0 MPa is 212.4°C according to the saturated water property tables. Since 220°C > Tsat, this water is a vapor. Question 6 A thermodynamic system contains 10 m 3 of air whose pressure and temperature are 300 kPa, 127°C respectively. The weight of this system is: A) 93 N B) 127 N C) 192 N D) 256 N Answer d is the correct answer. Treating this air as an ideal gas gives v = RT / P=(Ru/M)T/P = (8.314/28.97) (400) / 300 = 0.3826 m 3 /kg. Instead of Ru/M it’s fine to use R=0.287 for air. The weight is then
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Chapter 3 solution - ME 113 Homework Set 3 Due Feb 15 Show...

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