Code No: RR220802
RR
Set No. 2
in
II B.Tech II Semester Supplementary Examinations,May 2010 CHEMICAL ENGINEERING THERMODYNAMICS - I Chemical Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
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1. A system containing 0.2 m3 of air at a pressure of 4 bar and 1600 C expands isentropically to a pressure of 1.06 bar and after this the gas is heated at constant pressure till the enthalpy increases by 65 kj. Calculate the work done. Now imagine that these processes are replaced by a single reversible polytrophic process producing the same amount work between the initial and final state, find the index of expansion in this case. Take Cp of air as 1.005 kj / kg K. [16]
or
2. Steam gas at a temperature of 375 K has a specific volume of 0.0037 m3 /kg. Determine the pressure using steam table and following equations.. (a) the van der Waals equation of state
(b) the Beattie-Bridgeman equation of state, and (c) the Benedict-Webb-Rubin equation of state
[16]
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3. (a) What is a quasi-static process?
(b) In the macroscopic study of thermodynamics, the structure of matter is not taken into account. Are the results predicted from this approach applicable to all types of matter? Give an example. (c) State and explain the criterion of reversibility.
[4+6+6]
4. (a) Define internal energy of a system and show that it is a property of the system.
nt
(b) Starting from rest, to what velocity must it accelerate so that its kinetic energy is 1 kJ?
(c) With respect to a mass of 1 kg. How much change in elevation must it undergo to change its potential energy by 1 kJ? [5+5+6]
Aj
5. An inventor claims to have devised a process using only saturated steam at 1000 C which will, by a complicated series of steps, make heat continuously available at a temperature of 175C . He claims further that, for every pound of steam taken into the process, 200 Kcal of energy as heat is liberated at this higher temperature of 1750 C. Show whether or not such a process is possible. In order to give the inventor the benefit of any doubt, assume cooling water to be available in unlimited quantity at a temperature of 00 C. [16]
6. Discuss the limitations of first law and state various statements for second law of Thermodynamics. Prove that Kelvin Planck and clausius statements are equivalent. [16] 1
Code No: RR220802
RR
Set No. 2
7. Derive the steady flow energy equation and write the assumptions.
[16]
8. By supplying energy at an average rate of 21100 kJ/h, a heat pump maintains the temperature of dwelling at 210 C. If electricity costs 8 cents per kW.h, determine the minimum theoretical operating cost per each day of operation if the heat pump receives energy by heat transfer from
in
(a) The outdoor air at −50 C (b) Well water at 80 C.
[16]
Aj
nt
uW
or
ld .
?????
2
Code No: RR220802
RR
Set No. 4
in
II B.Tech II Semester Supplementary Examinations,May 2010 CHEMICAL ENGINEERING THERMODYNAMICS - I Chemical Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
ld .
1. A system containing 0.2 m3 of air at a pressure of 4 bar and 1600 C expands isentropically to a pressure of 1.06 bar and after this the gas is heated at constant pressure till the enthalpy increases by 65 kj. Calculate the work done. Now imagine that these processes are replaced by a single reversible polytrophic process producing the same amount work between the initial and final state, find the index of expansion in this case. Take Cp of air as 1.005 kj / kg K. [16]
2. (a) Define internal energy of a system and show that it is a property of the system.
or
(b) Starting from rest, to what velocity must it accelerate so that its kinetic energy is 1 kJ?
uW
(c) With respect to a mass of 1 kg. How much change in elevation must it undergo to change its potential energy by 1 kJ? [5+5+6] 3. Derive the steady flow energy equation and write the assumptions.
[16]
4. Steam gas at a temperature of 375 K has a specific volume of 0.0037 m3 /kg. Determine the pressure using steam table and following equations..
(a) the van der Waals equation of state
(b) the Beattie-Bridgeman equation of state, and [16]
nt
(c) the Benedict-Webb-Rubin equation of state 5. (a) What is a quasi-static process?
Aj
(b) In the macroscopic study of thermodynamics, the structure of matter is not taken into account. Are the results predicted from this approach applicable to all types of matter? Give an example. (c) State and explain the criterion of reversibility.
[4+6+6]
6. By supplying energy at an average rate of 21100 kJ/h, a heat pump maintains the temperature of dwelling at 210 C. If electricity costs 8 cents per kW.h, determine the minimum theoretical operating cost per each day of operation if the heat pump receives energy by heat transfer from (a) The outdoor air at −50 C (b) Well water at 80 C.
[16]
3
Code No: RR220802
RR
Set No. 4
7. Discuss the limitations of first law and state various statements for second law of Thermodynamics. Prove that Kelvin Planck and clausius statements are equivalent. [16]
Aj
nt
uW
or
?????
ld .
in
8. An inventor claims to have devised a process using only saturated steam at 1000 C which will, by a complicated series of steps, make heat continuously available at a temperature of 175C . He claims further that, for every pound of steam taken into the process, 200 Kcal of energy as heat is liberated at this higher temperature of 1750 C. Show whether or not such a process is possible. In order to give the inventor the benefit of any doubt, assume cooling water to be available in unlimited quantity at a temperature of 00 C. [16]
4
Code No: RR220802
RR
Set No. 1
in
II B.Tech II Semester Supplementary Examinations,May 2010 CHEMICAL ENGINEERING THERMODYNAMICS - I Chemical Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ????? 1. (a) What is a quasi-static process?
ld .
(b) In the macroscopic study of thermodynamics, the structure of matter is not taken into account. Are the results predicted from this approach applicable to all types of matter? Give an example.
(c) State and explain the criterion of reversibility.
[4+6+6]
or
2. Steam gas at a temperature of 375 K has a specific volume of 0.0037 m3 /kg. Determine the pressure using steam table and following equations.. (a) the van der Waals equation of state
(b) the Beattie-Bridgeman equation of state, and (c) the Benedict-Webb-Rubin equation of state
[16]
uW
3. A system containing 0.2 m3 of air at a pressure of 4 bar and 1600 C expands isentropically to a pressure of 1.06 bar and after this the gas is heated at constant pressure till the enthalpy increases by 65 kj. Calculate the work done. Now imagine that these processes are replaced by a single reversible polytrophic process producing the same amount work between the initial and final state, find the index of expansion in this case. Take Cp of air as 1.005 kj / kg K. [16]
nt
4. Discuss the limitations of first law and state various statements for second law of Thermodynamics. Prove that Kelvin Planck and clausius statements are equivalent. [16]
Aj
5. An inventor claims to have devised a process using only saturated steam at 1000 C which will, by a complicated series of steps, make heat continuously available at a temperature of 175C . He claims further that, for every pound of steam taken into the process, 200 Kcal of energy as heat is liberated at this higher temperature of 1750 C. Show whether or not such a process is possible. In order to give the inventor the benefit of any doubt, assume cooling water to be available in unlimited quantity at a temperature of 00 C. [16] 6. Derive the steady flow energy equation and write the assumptions.
[16]
7. (a) Define internal energy of a system and show that it is a property of the system. (b) Starting from rest, to what velocity must it accelerate so that its kinetic energy is 1 kJ?
5
Code No: RR220802
RR
Set No. 1
(c) With respect to a mass of 1 kg. How much change in elevation must it undergo to change its potential energy by 1 kJ? [5+5+6]
in
8. By supplying energy at an average rate of 21100 kJ/h, a heat pump maintains the temperature of dwelling at 210 C. If electricity costs 8 cents per kW.h, determine the minimum theoretical operating cost per each day of operation if the heat pump receives energy by heat transfer from (a) The outdoor air at −50 C (b) Well water at 80 C.
Aj
nt
uW
or
?????
ld .
[16]
6
Code No: RR220802
RR
Set No. 3
in
II B.Tech II Semester Supplementary Examinations,May 2010 CHEMICAL ENGINEERING THERMODYNAMICS - I Chemical Engineering Time: 3 hours Max Marks: 80 Answer any FIVE Questions All Questions carry equal marks ?????
ld .
1. Discuss the limitations of first law and state various statements for second law of Thermodynamics. Prove that Kelvin Planck and clausius statements are equivalent. [16] 2. (a) What is a quasi-static process?
(b) In the macroscopic study of thermodynamics, the structure of matter is not taken into account. Are the results predicted from this approach applicable to all types of matter? Give an example.
or
(c) State and explain the criterion of reversibility.
[4+6+6]
3. Steam gas at a temperature of 375 K has a specific volume of 0.0037 m3 /kg. Determine the pressure using steam table and following equations.. (a) the van der Waals equation of state
uW
(b) the Beattie-Bridgeman equation of state, and (c) the Benedict-Webb-Rubin equation of state
4. Derive the steady flow energy equation and write the assumptions.
[16] [16]
nt
5. By supplying energy at an average rate of 21100 kJ/h, a heat pump maintains the temperature of dwelling at 210 C. If electricity costs8 cents per kW.h, determine the minimum theoretical operating cost per each day of operation if the heat pump receives energy by heat transfer from (a) The outdoor air at −50 C
(b) Well water at 80 C.
[16]
Aj
6. A system containing 0.2 m3 of air at a pressure of 4 bar and 1600 C expands isentropically to a pressure of 1.06 bar and after this the gas is heated at constant pressure till the enthalpy increases by 65 kj. Calculate the work done. Now imagine that these processes are replaced by a single reversible polytrophic process producing the same amount work between the initial and final state, find the index of expansion in this case. Take Cp of air as 1.005 kj / kg K. [16]
7. (a) Define internal energy of a system and show that it is a property of the system. (b) Starting from rest, to what velocity must it accelerate so that its kinetic energy is 1 kJ?
7
Code No: RR220802
RR
Set No. 3
(c) With respect to a mass of 1 kg. How much change in elevation must it undergo to change its potential energy by 1 kJ? [5+5+6]
Aj
nt
uW
or
?????
ld .
in
8. An inventor claims to have devised a process using only saturated steam at 1000 C which will, by a complicated series of steps, make heat continuously available at a temperature of 175C . He claims further that, for every pound of steam taken into the process, 200 Kcal of energy as heat is liberated at this higher temperature of 1750 C. Show whether or not such a process is possible. In order to give the inventor the benefit of any doubt, assume cooling water to be available in unlimited quantity at a temperature of 00 C. [16]
8
