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Thermodynamics: An Engineering Approach, 4/e

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

Energy Transfer by Heat, Work, and Mass

Multiple Choice Quiz

Answer all the questions


1	The interaction that occurs between a system and its surroundings as the system executes a process, which is the result of the system being at a temperature different from the surroundings, is:
		A)	Mass transfer
		B)	Heat transfer
		C)	Work transfer
		D)	None of these


2	Which one of the equations below serves to define work?
		A)
		B)
		C)
		D)


3	Air is expanded from 1 MPa, 327 °C to 200 kPa in a closed piston-cylinder device executing a PV^1.2 = constant process. The work produced during this process is:
		A)	202.6 kJ/kg
		B)	263.4 kJ/kg
		C)	361.7 kJ/kg
		D)	422.8 kJ/kg


4	Oxygen (M = 32 kg/kg-mol) at 200 kPa, 27 °C is contained in a piston-cylinder device arranged to maintain a constant pressure. How much work is produced by this system when it is heated to 227 °C?
		A)	0 kJ/kg
		B)	11.2 kJ/kg
		C)	37.1 kJ/kg
		D)	52.0 kJ/kg


5	A 100 kg automobile accelerates from 10 km/hr to 120 km/hr. How much work does this require?
		A)	0 kJ
		B)	501 kJ
		C)	552 kJ
		D)	780 kJ


6	A closed system undergoes the series of quasi-equilibrium processes shown here. The total work produced by this series of processes is:
		A)	40 kJ
		B)	140 kJ
		C)	240 kJ
		D)	340 kJ


7	Steam at 1 mPa, 300 °C flows through a 30 cm diameter pipe with an average velocity of 10 m/s. The mass flow rate of this steam is:
		A)	0.731 kg/s
		B)	2.74 kg/s
		C)	3.18 kg/s
		D)	3.78 kg/s


8	Refrigerant-134a flows through a pipe at 800 kPa, 50 °C. The specific flow work required to move this fluid through a cross-section of the pipe is:
		A)	22.77 kJ/kg
		B)	31.60 kJ/kg
		C)	37.21 kJ/kg
		D)	40.70 kJ/kg


9	A mixture of ideal gases has an apparent molecular weight of 36.4 kg/kg-mole and a specific enthalpy of 273.2 kJ/kg when the temperature is 127 °C. The specific internal energy of this gas mixture is:
		A)	98.72 kJ/kg
		B)	153.1 kJ/kg
		C)	181.8 kJ/kg
		D)	273.2 kJ/kg


10	A 12 V DC electrical motor draws a current of 18 amps. How much work does this motor produce over a 10-minute period of operation?
		A)	97.42 kJ
		B)	129.6 kJ
		C)	216.0 kJ
		D)	318.2 kJ

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