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Long Quiz 2 Thermodynamics

The document contains 5 questions regarding thermodynamics. Question 1 asks about the validity of claims made about a heat engine process. Question 2 involves finding pressure, volume, and n values for a reversible process. Question 3 has multiple parts calculating work, heat, and internal energy change for different reversible processes of a gas. Question 4 asks to state and discuss the 3rd law of thermodynamics. Question 5 asks to calculate the enthalpy of a fluid given its internal energy, volume, and pressure.

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Su-ho Han
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333 views1 page

Long Quiz 2 Thermodynamics

The document contains 5 questions regarding thermodynamics. Question 1 asks about the validity of claims made about a heat engine process. Question 2 involves finding pressure, volume, and n values for a reversible process. Question 3 has multiple parts calculating work, heat, and internal energy change for different reversible processes of a gas. Question 4 asks to state and discuss the 3rd law of thermodynamics. Question 5 asks to calculate the enthalpy of a fluid given its internal energy, volume, and pressure.

Uploaded by

Su-ho Han
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© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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LONG QUIZ 2

THERMODYNAMICS
1. (15 pts) An inventor proposes a heat engine that receives heat (160 kJ/min) at 800 K. For a
sink temperature of 500 K, he claims that 65 kJ/min work are delivered. Do you think this
claim is justifiable? Is any thermodynamic principle violated? Explain.
2. (20 pts) A closed system executes a reversible process wherein the pressure, and the
n
volume varies in accordance with pV = C; Q = 16.247 kJ, U=47.475 kJ. If p1= 138 kPaa,
V1=141.6 liters and p2= 827.4 kPaa, find n and V2.
3. (40 pts) A gaseous substance whose properties are unknown , except as specified below,
undergoes an internally reversible process during which
3
V = (-0.1p + 300 ) ft when p is in psfa
a. For this process, find - Vdp and  pdv both in Btu, if the pressure changes from
1000 psfa to 100 psfa.
b. If the process is steady state, steady flow with the kinetic energy increasing 25 Btu,
PE=0, and the enthalpy decreasing 300 Btu, determine the work and heat.
c. If the process is non-flow, what is the work and the change in internal energy?
4. (20 pts) State and discuss the 3 law of thermodynamics.
5. Calculate the enthalpy of 1 lbm of fluid which occupies a volume of 10 ft 3 if the internal
energy is 450 Btu/lbm and the pressure is 35 psia.

The Lord is not slow in keeping his promise, as some understand slowness. He is patient
with you, not wanting anyone to perish, but everyone to come to repentance.
2 Peter 3:9

LONG QUIZ 2
THERMODYNAMICS
1. (15 pts) An inventor proposes a heat engine that receives heat (160 kJ/min) at 800 K.
For a sink temperature of 500 K, he claims that 65 kJ/min work are delivered. Do you
think this claim is justifiable? Is any thermodynamic principle violated? Explain.
2. (20 pts) A closed system executes a reversible process wherein the pressure, and the
n
volume varies in accordance with pV = C; Q = 16.247 kJ, U=47.475 kJ. If p1= 138
kPaa, V1=141.6 liters and p2= 827.4 kPaa, find n and V2.
3. (40 pts) A gaseous substance whose properties are unknown , except as specified
below, undergoes an internally reversible process during which
3
V = (-0.1p + 300 ) ft when p is in psfa
d. For this process, find - Vdp and  pdv both in Btu, if the pressure changes from
1000 psfa to 100 psfa.
e. If the process is steady state, steady flow with the kinetic energy increasing 25 Btu,
PE=0, and the enthalpy decreasing 300 Btu, determine the work and heat.
f. If the process is non-flow, what is the work and the change in internal energy?
4. (20 pts) State and discuss the 3 law of thermodynamics.
5. Calculate the enthalpy of 1 lbm of fluid which occupies a volume of 10 ft 3 if the internal
energy is 450 Btu/lbm and the pressure is 35 psia.

The Lord is not slow in keeping his promise, as some understand slowness. He is patient
with you, not wanting anyone to perish, but everyone to come to repentance.
2 Peter 3:9
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