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Thermodynamics: An Engineering Approach, 4/e

Yunus A. Çengel, University of Nevada, Reno
Michael A. Boles, North Carolina State University

Properties of Pure Substances

Multiple Choice Quiz

Answer all the questions


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


2	Which state on this phase diagram is the critical state?
		A)	A
		B)	B
		C)	C
		D)	D


3	In which region of the property diagram below are liquid-vapor mixture states located?
		A)	A
		B)	B
		C)	C
		D)	D


4	The specific volume of a system consisting of refrigerant-134a at 1.0 Mpa is 0.01 m³/kg. The quality of the R-134a is:
		A)	12.6 %
		B)	47.2 %
		C)	68.3 %
		D)	Not applicable


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


6	A thermodynamic system contains water at 10 m³ of air whose pressure and temperature are 300 kPa, 127° C respectively. The weight fo this system is:
		A)	93 N
		B)	127 N
		C)	192 N
		D)	256 N


7	Air in a closed piston-cylinder device arranged to maintain a pressure of 400 kPa is heated from 27 ° C to 227 ° C. Intially the volume of the air is 1 liter. What is the final air volume?
		A)	0.5 liters
		B)	0.00167 m³
		C)	2.4 liters
		D)	0.036 m³


8	Propane gas (P_c = 4.26 MPa, T_c = 370 K) is maintained at 6.39 MPa and 444 K. How much volume does 1 kg of this gas fill?
		A)	8.78 liters
		B)	12.3 liters
		C)	13.1 liters
		D)	15.7 liters


9	Air (c_p = 1.005 kJ/kg-k) is heated from 27 ° C to 327 ° C. How much does the specific internal energy of the air change as a result of this heating?
		A)	301.5 kJ/kg decrease
		B)	301.5 kJ/kg increase
		C)	215.4 kJ/kg decrease
		D)	215.4 kJ/kg increase


10	Steam at 1 MPa, 250 °C is contained in a rigid vessel. It is now cooled to 25 ° C. The final quality (if applicable) of the vessel contents is:
		A)	0.54 %
		B)	2.63 %
		C)	27.8 %
		D)	Not applicable

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