Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 3rd Sem Old 131404 Food Engineering Thermodynamics Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?III (OLD) EXAMINATION ? WINTER 2018
Subject Code:131404 Date:05/12/2018
Subject Name:Food Engineering Thermodynamics
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Standard Steam Tables and Psychrometric Chart can be used
Q.1 (a) What are ideal gases? In what way real gases differ from ideal behaviour?
A container of 0.5 m
3
contains nitrogen gas at 5 atmosphere pressure and 17
o
C.
Calculate the mass of gas in kg. Assume ideal gas behaviour.
[Take R = 8.314 J/mol K]
07
(b) State the law of corresponding states. Hundred kilogram of CO2 gas is stored in a 10
liter sealed container at 2
o
C. Calculate the pressure of the gas in kPa using
compressibility factor of z = 0.82. [Take M = 44 and R = 8.314 J/mole K]
07
Q.2 (a) State Zero
th
law of thermodynamics. Convert 77
o
F in
o
C and Kelvin. Explain with
a neat diagram the principle and working of any one thermometer.
07
(b) Explain Joule-Kelvin effect. Prove that for an ideal gas undergoing a throttling
process,
0
T , j
? ?
07
OR
(b)
Define enthalpy. Prove that R C C
v p
? ? for ideal gases.
Five moles of SO2 gas at 300K is heated reversibly at a constant pressure of 2 bar
until its volume doubles. Calculate
(i) The work done.
(ii) Change in internal energy and enthalpy.
[Assume ideal behaviour , Cv = 32 J/mol K, R = 8.314 J/mol k]
07
Q.3 (a) Explain first law of thermodynamics for a closed system operating in a cycle.
Prove that the work done by the system during an isentropic process is given by
W = ) (
1
1
2 2 1 1
V P V P ?
? ?
.
07
(b) What is SFEE? A steam turbine developing 600 kW receives a flow of 25 tonne/h
of steam @ 110 m/s. The exit velocity of steam is 325 m/s. The inlet pipe is located
1.5 m above the outlet pipe. Using SFEE, calculate the change in enthalpy.
07
OR
Q.3 (a) What is first law of thermodynamics? Prove that for a reversible adiabatic process
?
?1 ?
V T Constant.
07
(b) What is Gibb?s phase rule? Explain different types of thermodynamic equilibrium.
Calculate the thermodynamic degrees of freedom of pure water at its critical point.
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?III (OLD) EXAMINATION ? WINTER 2018
Subject Code:131404 Date:05/12/2018
Subject Name:Food Engineering Thermodynamics
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Standard Steam Tables and Psychrometric Chart can be used
Q.1 (a) What are ideal gases? In what way real gases differ from ideal behaviour?
A container of 0.5 m
3
contains nitrogen gas at 5 atmosphere pressure and 17
o
C.
Calculate the mass of gas in kg. Assume ideal gas behaviour.
[Take R = 8.314 J/mol K]
07
(b) State the law of corresponding states. Hundred kilogram of CO2 gas is stored in a 10
liter sealed container at 2
o
C. Calculate the pressure of the gas in kPa using
compressibility factor of z = 0.82. [Take M = 44 and R = 8.314 J/mole K]
07
Q.2 (a) State Zero
th
law of thermodynamics. Convert 77
o
F in
o
C and Kelvin. Explain with
a neat diagram the principle and working of any one thermometer.
07
(b) Explain Joule-Kelvin effect. Prove that for an ideal gas undergoing a throttling
process,
0
T , j
? ?
07
OR
(b)
Define enthalpy. Prove that R C C
v p
? ? for ideal gases.
Five moles of SO2 gas at 300K is heated reversibly at a constant pressure of 2 bar
until its volume doubles. Calculate
(i) The work done.
(ii) Change in internal energy and enthalpy.
[Assume ideal behaviour , Cv = 32 J/mol K, R = 8.314 J/mol k]
07
Q.3 (a) Explain first law of thermodynamics for a closed system operating in a cycle.
Prove that the work done by the system during an isentropic process is given by
W = ) (
1
1
2 2 1 1
V P V P ?
? ?
.
07
(b) What is SFEE? A steam turbine developing 600 kW receives a flow of 25 tonne/h
of steam @ 110 m/s. The exit velocity of steam is 325 m/s. The inlet pipe is located
1.5 m above the outlet pipe. Using SFEE, calculate the change in enthalpy.
07
OR
Q.3 (a) What is first law of thermodynamics? Prove that for a reversible adiabatic process
?
?1 ?
V T Constant.
07
(b) What is Gibb?s phase rule? Explain different types of thermodynamic equilibrium.
Calculate the thermodynamic degrees of freedom of pure water at its critical point.
07
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2
Q.4 (a)
Explain Clausius statement of second law of thermodynamics with the help of a neat
schematic diagram.
Prove that
0 ) ( ?
?
T
dQ
for any irreversible cyclic process.
07
(b) Explain Carnot theorems. A Carnot heat engine operates between a source
temperature of 620
0
C and a sink temperature of 37
0
C. The work output is 20 kW.
Calculate the amount of heat rejected to sink.
07
OR
Q.4 (a) Explain the operation of a heat pump with help of a schematic diagram. A heat
pump is operating between 5
o
C and 30
o
C at a COP of 50 % of the maximum
possible COP. If the net heating effect generated is 5 kW, calculate the power
requirement.
07
(b)
Explain Kelvin-Plank statement of second law of thermodynamics with the help of a neat
schematic diagram. Show that for any reversible thermodynamic process:
P S
S
V
P
T
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
07
Q.5 (a) Draw a neat labeled P-v diagram of a pure substance (water) showing its various
states. Show that the specific volume of wet steam is given by,
? = ? g + (1?x) ? fg.
Determine the following using steam tables for saturated steam at 5 bar pressure:
(i) Saturation temperature in
o
C
(ii) Entropy in kJ/kg K
(iii) Latent heat of vaporization in kJ/kg
(iv) Specific volume in m
3
/kg
07
(b) Explain the following processes on a Psychrometric Chart:
(i) Sensible heating (ii) Cooling and Dehumidification.
The following data are available for the atmospheric air:
Temperature = 40
o
C, Atmospheric Pressure = 760 mm Hg and RH = 80%. Using
Psychrometric Chart determine the following:
(i) Mass of air in kg.
(ii) DPT in
o
C
(iii) WBT in
o
C
(iv) Enthalpy
(v) Specific volume
07
OR
Q.5 (a) Explain phase diagram of a pure substance (Water) on a T-s diagram.
Using Steam Tables determine the following for saturated steam at 150
o
C:
(i) Specific enthalpy (ii) Latent heat of vaporization (hfg)
(iii) Density (iv) Specific entropy
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?III (OLD) EXAMINATION ? WINTER 2018
Subject Code:131404 Date:05/12/2018
Subject Name:Food Engineering Thermodynamics
Time:10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Standard Steam Tables and Psychrometric Chart can be used
Q.1 (a) What are ideal gases? In what way real gases differ from ideal behaviour?
A container of 0.5 m
3
contains nitrogen gas at 5 atmosphere pressure and 17
o
C.
Calculate the mass of gas in kg. Assume ideal gas behaviour.
[Take R = 8.314 J/mol K]
07
(b) State the law of corresponding states. Hundred kilogram of CO2 gas is stored in a 10
liter sealed container at 2
o
C. Calculate the pressure of the gas in kPa using
compressibility factor of z = 0.82. [Take M = 44 and R = 8.314 J/mole K]
07
Q.2 (a) State Zero
th
law of thermodynamics. Convert 77
o
F in
o
C and Kelvin. Explain with
a neat diagram the principle and working of any one thermometer.
07
(b) Explain Joule-Kelvin effect. Prove that for an ideal gas undergoing a throttling
process,
0
T , j
? ?
07
OR
(b)
Define enthalpy. Prove that R C C
v p
? ? for ideal gases.
Five moles of SO2 gas at 300K is heated reversibly at a constant pressure of 2 bar
until its volume doubles. Calculate
(i) The work done.
(ii) Change in internal energy and enthalpy.
[Assume ideal behaviour , Cv = 32 J/mol K, R = 8.314 J/mol k]
07
Q.3 (a) Explain first law of thermodynamics for a closed system operating in a cycle.
Prove that the work done by the system during an isentropic process is given by
W = ) (
1
1
2 2 1 1
V P V P ?
? ?
.
07
(b) What is SFEE? A steam turbine developing 600 kW receives a flow of 25 tonne/h
of steam @ 110 m/s. The exit velocity of steam is 325 m/s. The inlet pipe is located
1.5 m above the outlet pipe. Using SFEE, calculate the change in enthalpy.
07
OR
Q.3 (a) What is first law of thermodynamics? Prove that for a reversible adiabatic process
?
?1 ?
V T Constant.
07
(b) What is Gibb?s phase rule? Explain different types of thermodynamic equilibrium.
Calculate the thermodynamic degrees of freedom of pure water at its critical point.
07
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2
Q.4 (a)
Explain Clausius statement of second law of thermodynamics with the help of a neat
schematic diagram.
Prove that
0 ) ( ?
?
T
dQ
for any irreversible cyclic process.
07
(b) Explain Carnot theorems. A Carnot heat engine operates between a source
temperature of 620
0
C and a sink temperature of 37
0
C. The work output is 20 kW.
Calculate the amount of heat rejected to sink.
07
OR
Q.4 (a) Explain the operation of a heat pump with help of a schematic diagram. A heat
pump is operating between 5
o
C and 30
o
C at a COP of 50 % of the maximum
possible COP. If the net heating effect generated is 5 kW, calculate the power
requirement.
07
(b)
Explain Kelvin-Plank statement of second law of thermodynamics with the help of a neat
schematic diagram. Show that for any reversible thermodynamic process:
P S
S
V
P
T
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
?
07
Q.5 (a) Draw a neat labeled P-v diagram of a pure substance (water) showing its various
states. Show that the specific volume of wet steam is given by,
? = ? g + (1?x) ? fg.
Determine the following using steam tables for saturated steam at 5 bar pressure:
(i) Saturation temperature in
o
C
(ii) Entropy in kJ/kg K
(iii) Latent heat of vaporization in kJ/kg
(iv) Specific volume in m
3
/kg
07
(b) Explain the following processes on a Psychrometric Chart:
(i) Sensible heating (ii) Cooling and Dehumidification.
The following data are available for the atmospheric air:
Temperature = 40
o
C, Atmospheric Pressure = 760 mm Hg and RH = 80%. Using
Psychrometric Chart determine the following:
(i) Mass of air in kg.
(ii) DPT in
o
C
(iii) WBT in
o
C
(iv) Enthalpy
(v) Specific volume
07
OR
Q.5 (a) Explain phase diagram of a pure substance (Water) on a T-s diagram.
Using Steam Tables determine the following for saturated steam at 150
o
C:
(i) Specific enthalpy (ii) Latent heat of vaporization (hfg)
(iii) Density (iv) Specific entropy
07
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3
(b) Define the following in relation to moist air:
i. Dry bulb temperature
ii. Wet bulb and temperature
iii. Adiabatic saturation temperature
Air at a certain location having a barometric pressure of 760 mm Hg, air is at DBT
and WBT of 35
o
C and 26
o
C respectively. Determine the following using
Psychrometric Chart:
(i) Absolute humidity (ii) Relative humidity
(iii) Relative humidity (iv) Dew point temperature
07
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This post was last modified on 20 February 2020