ME 2334 Thermodynamics Exam 1 Questions and Answers
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Course
ME 2334 Thermodynamics
Institution
ME 2334 Thermodynamics
ME 2334 Thermodynamics Exam 1
1.19) a large fraction of thermal energy generated in the engine of a car is rejected to the air by the radiator through the circulating water. should the radiator be analyzed as a
closed or open system? - Answer- Open because air goes in and out and there is ener...
ME 2334 Thermodynamics Exam 1
1.19) a large fraction of thermal energy generated in the engine of a car is rejected to
the air by the radiator through the circulating water. should the radiator be analyzed
as a
closed or open system? - Answer- Open because air goes in and out and there is
energy exchange with the surroudings
1.36) temperature of a system rises by 130°C during a heating process. express this
rise in T in K. - Answer- 130 K
1.55) the barometer of a mountain hiker reads 750 mbars at the beginning of a hiking
trip and 650 mbars at the end. determine the vertical distance climbed. average air
density is 1.20 kg/m³. - Answer- 850 m
1.63) a manometer containing oil (density is 850 kg/m³) is attached to a tank filled
with air. If the oil level difference between the two columns is 80 cm and the
atmospheric pressure is 98 kPa,
determine the absolute pressure of the air in the tank. - Answer- 104664 atm
1.67E) The pressure in a natural gas pipeline is measured by the manometer shown
in the figure with one of the arms open to the atmosphere where the local
atmospheric pressure is 14.2 psia. Determine the absolute pressure in the pipeline.
1 lbm/ft*s² = divide by 4636.8 to get psia.
g = 32.2 ft/s² - Answer- 18.1 psia
1.90) a hydraulic lift is used to lift a 1900 kg weight by putting a weight of 25 kg on a
piston with a diameter of 10 cm. determine the diameter of the piston on which the
weight is to be placed. - Answer- 0.87 m
1.93E) The boiling temperature of water decreases by about 3°C for each 1000-m
rise in altitude. What is the decrease in the boiling temperature in (a) K, (b) °F, and
(c) R for each 1000-m rise in altitude? - Answer- a) 3K
b) 5.4 R
c) 5.4 °F
1.97) A vertical, frictionless piston-cylinder device contains a gas at 180 kPa
absolute pressure. The atmospheric pressure outside is 100 kPa, and the piston
area is 25 cm². Determine the mass of the piston. - Answer- 20.4 kg
2.20) what is an adiabatic process? what is an adiabatic system? - Answer- adiabatic
process: one that has 0 heat transfer. δQ=0
adiabatic system: one that has no heat transfer between the system and the
surroundings. Q=0 and Qdot=0
2.23C) a room is heated by an iron that is left plugged in. is this a heat or work
interaction? take the entire room, including the iron, as the system. - Answer- work
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