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Engineering Thermodynamics Questions with Solutions
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Engineering Thermodynamics
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Thermo Final Concept QuestionsEngineering thermodynamics does not include - answercreation and utilization of
energy
In a quasi-equilibrium process, the pressure in a system - answeris everywhere
constant at an instant
Which of the following is not an extensive property - answerdensity
Which of the following would be identified with a control volume - answerFilling a tire
with air at a service station
Which of the following is not an intensive property - answerVolume
Which of the following is a quasi-equilibrium process? - answerCompression of air in a
cylinder
Which of the following is not an acceptable SI unit - answerDensity measured in grams
per centimeter
The unit of joule can be converted to which of the following - answerPa*m3
The standard atmosphere in meters of ammonia (= 600 kg/m3) is - answer17 m
Convert 200 kPa gage to gage millimeters of mercury (Hg =13.6 specific gravity) -
answer1500 mm
A gage pressure of 400 kPa acting on a 4-cm-diameter piston is resisted by a spring
with a spring constant of 800 N/m. How much is the spring compressed? Neglect the
piston weight - answer630 mm
Disregarding external atmospheric pressure effects, calculate the pressure in the 200-
mmdiameter cylinder shown in Fig. 1.M1. The spring is compressed 40 cm - answer38
kPa
Disregarding external atmospheric pressure effects, what pressure force exists on an
80-cm-diameter horizontal area at a depth 300m below the surface of a lake -
answer1480 kN
, An office worker claims that a cup of cold coffee on his table warmed up to 80°C by
simply picking energy from the surrounding air, which is at 25°C. Is there any truth to his
claim? - answerNo
In order to analyze the function of a reciprocating air compressor (a piston-cylinder
device), what kind of thermodynamic system will you use? - answerclosed system
Consider an alcohol and a mercury thermometer that read exactly 0°C at the ice point
and 100°C at the steam point. The distance between the two points is divided into 100
equal parts in both thermometers. Will these thermometers give exactly the same
reading at a temperature of, say, 60°C? - answerMaybe
Consider two closed systems A and B. System A contains 3000 kJ of thermal energy at
20°C, whereas system B contains 200 kJ of thermal energy at 50°C. Now the systems
are brought into contact with each other. Determine the direction of any heat transfer
between the two systems. - answerB to A
Someone claims that the absolute pressure in a liquid of constant density doubles when
the depth is doubled. Is this assertion correct? - answerNo
Internal energy includes all of the following except - answerisothermal magnetic energy
Heat and work are - answerpath functions
Heat is - answerA method of energy transfer
A directional quantity
Associated with a process
Systems posses - answerenergy
In the absence of magnetic, electrical and surface tension effects, total energy of a
system
consists of - answerpotential, kinetic, internal energies
The difference between mechanical and thermal energy is that - answerthermal energy
cannot be converted to work directly and completely
A distinctive mechanism for energy transfer to or from a control volume unlike the case
of a control mass is - answermass transport
For a cycle - answernet work is zero in a closed adiabatic system
On a hot summer day, a student's room is the only room in a students' block with the
room's fan on. The student leaves his fan on when he leaves his room in the morning.
Assume all the doors and windows in the block are kept closed. When he returns in the
evening, the room will be - answerwarmer than the neighboring rooms
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