Download Visvesvaraya Technological University (VTU) BE ( Bachelor of Engineering) ME (Mechanical Engineering) 2018 Scheme 2020 January Previous Question Paper 3rd Sem 18ME33 Basic Thermodynamics
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18M E33
Third Semester B.E. Degree Examination, Dee.24
1
04ftn.2020
Basic Thermodynamics
USN
Time: 3 hrs.
Max. Marks: 100
Note: I. Answer any FIVE full questions, choosing ONE full question from each module.
2. Use of thermodynamic data hand book and steam tables is permitted.
3. Assume missing data suitably-
Module-1
1 a. Differentiate between micro and macroscopic approach. (04 Marks)
b. Define the following terms with neat sketch:
(i) Open system
(ii) Closed system
(iii) Isolated system
(iv) Quasi-static process (08 Marks)
c.
The temperature 'T' on a thermometric scale is defined as T = al n(K)+ b , where a and b are
constants. The values of K are found to be 1.83 and 6.78 at 0?C and 100?C, respectively.
Calculate the temperature for value of K = 2.42. (08 Marks)
OR
2 a. Define:
(i) Thermodynamic equilibrium
(ii) Zeroth law of thermodynamics (04 Marks)
b. With neat sketch explain the working principle of:
( i) Electrical resistance thermometer
(ii) Thermocouple (08 Marks)
c. Two Celsius thermometer 'A' and 'B' agree at ice point and steam point, and related by the
equation t = L + Mt
B
+ , where L, M and N are constants. When both thermometers are
immersed in a fluid, 'A' registers 26?C, while 'B' registers 25?C. Determine the reading of
`A' when 'B' reads 37.4?C. (08 Marks)
Module-2
3 a. Define thermodynamic work and heat. (04 Marks)
b. Write an expression for displacement of work for the following process with P-V diagrams.
(i) Constant pressure
(ii) Constant volume
(iii) Constant temperature
(iv) Polytropic process (08 Marks)
c. A quantity of gas is compressed in a piston-cylinder from a volume of 0.8611 m
3
to a final
volume of 0.1721 m
3
. The pressure in (bar) and as a function of volume (m
3
) is given by:
P
_0.8611 8.6067 x 10
- 5
V
(i) Find the amount of work done in KJ.
(ii) If the atmospheric pressure is I bar, acting on the other side of piston is considered. Find
the net work done in KJ. (08 \larks)
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-
'"
/
.
7. , I
18M E33
Third Semester B.E. Degree Examination, Dee.24
1
04ftn.2020
Basic Thermodynamics
USN
Time: 3 hrs.
Max. Marks: 100
Note: I. Answer any FIVE full questions, choosing ONE full question from each module.
2. Use of thermodynamic data hand book and steam tables is permitted.
3. Assume missing data suitably-
Module-1
1 a. Differentiate between micro and macroscopic approach. (04 Marks)
b. Define the following terms with neat sketch:
(i) Open system
(ii) Closed system
(iii) Isolated system
(iv) Quasi-static process (08 Marks)
c.
The temperature 'T' on a thermometric scale is defined as T = al n(K)+ b , where a and b are
constants. The values of K are found to be 1.83 and 6.78 at 0?C and 100?C, respectively.
Calculate the temperature for value of K = 2.42. (08 Marks)
OR
2 a. Define:
(i) Thermodynamic equilibrium
(ii) Zeroth law of thermodynamics (04 Marks)
b. With neat sketch explain the working principle of:
( i) Electrical resistance thermometer
(ii) Thermocouple (08 Marks)
c. Two Celsius thermometer 'A' and 'B' agree at ice point and steam point, and related by the
equation t = L + Mt
B
+ , where L, M and N are constants. When both thermometers are
immersed in a fluid, 'A' registers 26?C, while 'B' registers 25?C. Determine the reading of
`A' when 'B' reads 37.4?C. (08 Marks)
Module-2
3 a. Define thermodynamic work and heat. (04 Marks)
b. Write an expression for displacement of work for the following process with P-V diagrams.
(i) Constant pressure
(ii) Constant volume
(iii) Constant temperature
(iv) Polytropic process (08 Marks)
c. A quantity of gas is compressed in a piston-cylinder from a volume of 0.8611 m
3
to a final
volume of 0.1721 m
3
. The pressure in (bar) and as a function of volume (m
3
) is given by:
P
_0.8611 8.6067 x 10
- 5
V
(i) Find the amount of work done in KJ.
(ii) If the atmospheric pressure is I bar, acting on the other side of piston is considered. Find
the net work done in KJ. (08 \larks)
OR
4 a. State I
s
' law of thermodynamics. Derive an expression for 1
st
law of thermodynamics for
open system (SFEE). (10 Marks)
b. The working fluid, in a steady flow process at a rate of 220 kg/min. The fluid rejects
100 KJ/s of heat passing through the system. The condition of the fluid at inlet and outlet are
given as V
c
-
-
. 220 m/s, p
i
= 6.0 bar, u
i
= 2000 KJ/kg, ui = 0.36 m
3
/kg and p, = 1.2 bar,
V, = 140 m/s, u, = 1400 kJ/kg, 0, = 1.3 m
3
/kg. The suffix 1 and 2 indicates at inlet and
outlet conditions respectively. Determine the power capacity of the system in MW.
(10 Marks)
Module-3
5 a. Define the following terms:
( i) Thermal reservoir
(ii) Heat engine
(iii) Kelvin-Plank statement of 2'
1
law
(iv) Clausius statement of r
i
law
(v) Heat pump (10 Marks)
.?
b. A heat engine working on a Carnot cycle absorbs heat from three thermal reservoirs at
1000 K, 800 K and 600 K, respectively. The engine does 10 KW of net work and rejects
400 kJ/min of heat to a heat sink at 300 K. If the heat supplied by the reservoir at 1000 K is
60% of heat supplied by the reservoir at 600K. Find the quantity of heat supplied by each
reservoirs. (10 Marks)
6 a.
b.
c.
OR
Define entropy and prove that it is a point function. (04 Marks)
Discuss the Clausius Inequality. (08 Marks)
A steel ball mass of 10 kg at 627?C is dropped in 100 kg of oil at 30?C. The specific heat of
steel and oil are 0.5 kJ/kgK and 3.5 kJ/kgK, respectively. Calculate the entropy change of
steel, oil and the universe. (08 Marks)
7 a.
b.
C.
Module-4
With neat sketch, explain available and Unavailable energy on T-S diagran
Explain the concept of second law of efficiency.
A Carnot engine works between the temperature limits 225?C and 25?C
used as the working fluid. If heat is supplied to the saturated liquid at
converted into saturated vapour, determine per kg of water.
(i) Amount of heat absorbed by the fluid
(ii) Available energy
(iii) Unavailable energy
(Take latent heat of water = 1858.5 klikg)
(06 Marks,
(06 Marks)
in which water is
225?C, until it is
(08 Marks)
8 a.
b.
OR
With neat sketch explain the working of separating and throttling calorimeter. (10 Marks)
A vessel of volume 0.04 m
3
contains a mixture of saturated water and saturated state at a
temperature of 250?C. The mass of the liquid present is 9 kg. Find the mass, specific
volume, enthalpy, entropy and internal energy of the steam. (10 Marks)
?
2 of 3
I
,
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.?
?
-
'"
/
.
7. , I
18M E33
Third Semester B.E. Degree Examination, Dee.24
1
04ftn.2020
Basic Thermodynamics
USN
Time: 3 hrs.
Max. Marks: 100
Note: I. Answer any FIVE full questions, choosing ONE full question from each module.
2. Use of thermodynamic data hand book and steam tables is permitted.
3. Assume missing data suitably-
Module-1
1 a. Differentiate between micro and macroscopic approach. (04 Marks)
b. Define the following terms with neat sketch:
(i) Open system
(ii) Closed system
(iii) Isolated system
(iv) Quasi-static process (08 Marks)
c.
The temperature 'T' on a thermometric scale is defined as T = al n(K)+ b , where a and b are
constants. The values of K are found to be 1.83 and 6.78 at 0?C and 100?C, respectively.
Calculate the temperature for value of K = 2.42. (08 Marks)
OR
2 a. Define:
(i) Thermodynamic equilibrium
(ii) Zeroth law of thermodynamics (04 Marks)
b. With neat sketch explain the working principle of:
( i) Electrical resistance thermometer
(ii) Thermocouple (08 Marks)
c. Two Celsius thermometer 'A' and 'B' agree at ice point and steam point, and related by the
equation t = L + Mt
B
+ , where L, M and N are constants. When both thermometers are
immersed in a fluid, 'A' registers 26?C, while 'B' registers 25?C. Determine the reading of
`A' when 'B' reads 37.4?C. (08 Marks)
Module-2
3 a. Define thermodynamic work and heat. (04 Marks)
b. Write an expression for displacement of work for the following process with P-V diagrams.
(i) Constant pressure
(ii) Constant volume
(iii) Constant temperature
(iv) Polytropic process (08 Marks)
c. A quantity of gas is compressed in a piston-cylinder from a volume of 0.8611 m
3
to a final
volume of 0.1721 m
3
. The pressure in (bar) and as a function of volume (m
3
) is given by:
P
_0.8611 8.6067 x 10
- 5
V
(i) Find the amount of work done in KJ.
(ii) If the atmospheric pressure is I bar, acting on the other side of piston is considered. Find
the net work done in KJ. (08 \larks)
OR
4 a. State I
s
' law of thermodynamics. Derive an expression for 1
st
law of thermodynamics for
open system (SFEE). (10 Marks)
b. The working fluid, in a steady flow process at a rate of 220 kg/min. The fluid rejects
100 KJ/s of heat passing through the system. The condition of the fluid at inlet and outlet are
given as V
c
-
-
. 220 m/s, p
i
= 6.0 bar, u
i
= 2000 KJ/kg, ui = 0.36 m
3
/kg and p, = 1.2 bar,
V, = 140 m/s, u, = 1400 kJ/kg, 0, = 1.3 m
3
/kg. The suffix 1 and 2 indicates at inlet and
outlet conditions respectively. Determine the power capacity of the system in MW.
(10 Marks)
Module-3
5 a. Define the following terms:
( i) Thermal reservoir
(ii) Heat engine
(iii) Kelvin-Plank statement of 2'
1
law
(iv) Clausius statement of r
i
law
(v) Heat pump (10 Marks)
.?
b. A heat engine working on a Carnot cycle absorbs heat from three thermal reservoirs at
1000 K, 800 K and 600 K, respectively. The engine does 10 KW of net work and rejects
400 kJ/min of heat to a heat sink at 300 K. If the heat supplied by the reservoir at 1000 K is
60% of heat supplied by the reservoir at 600K. Find the quantity of heat supplied by each
reservoirs. (10 Marks)
6 a.
b.
c.
OR
Define entropy and prove that it is a point function. (04 Marks)
Discuss the Clausius Inequality. (08 Marks)
A steel ball mass of 10 kg at 627?C is dropped in 100 kg of oil at 30?C. The specific heat of
steel and oil are 0.5 kJ/kgK and 3.5 kJ/kgK, respectively. Calculate the entropy change of
steel, oil and the universe. (08 Marks)
7 a.
b.
C.
Module-4
With neat sketch, explain available and Unavailable energy on T-S diagran
Explain the concept of second law of efficiency.
A Carnot engine works between the temperature limits 225?C and 25?C
used as the working fluid. If heat is supplied to the saturated liquid at
converted into saturated vapour, determine per kg of water.
(i) Amount of heat absorbed by the fluid
(ii) Available energy
(iii) Unavailable energy
(Take latent heat of water = 1858.5 klikg)
(06 Marks,
(06 Marks)
in which water is
225?C, until it is
(08 Marks)
8 a.
b.
OR
With neat sketch explain the working of separating and throttling calorimeter. (10 Marks)
A vessel of volume 0.04 m
3
contains a mixture of saturated water and saturated state at a
temperature of 250?C. The mass of the liquid present is 9 kg. Find the mass, specific
volume, enthalpy, entropy and internal energy of the steam. (10 Marks)
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2 of 3
I
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18ME33
Module-5
9 a. Define:
(i) Mole fraction
(ii) Mass fraction
(iii) Dalton's law
(iv) Amgat's law of volume additives (10 Marks)
b. A mixture of gases contain 1 kg of CO2 and 1.5 kg of N2. The pressure and temperature of
the mixture are 3.5 bar and 27?C. Determine:
(i) Mole fraction of each constituent
(ii) Partial pressure
(iii) Partial volume
(iv) Volume of mixture
(v) Density of mixture (10 Marks)
OR
10 a. State and explain the following terms:
(i) Compressibility factor
(ii) Reduced properties
(iii) Real gases
(iv) Relative humidity (08 Marks)
b. With usual notations, write the Vandeer Waal equation and explain the terms involved in it.
(04 Marks)
C.
Determine the pressure exerted by CO
,
in a container of 1.5 m
3
capacity when it contains
5 kg at 27?C:
(i) Using ideal gas relation
(ii) Using Vandeer Waal's equation
[Take a = 364.3 kPa (m
3
lkg.mol)
2
: b = 0.0427 (m
3
/kg.mol) for Vandeer Waal's constants]
(08 Marks)
3 of 3
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This post was last modified on 02 March 2020