Download VTU BE 2020 Jan ME Question Paper 17 Scheme 4th Sem 17ME43 Applied Thermodynamics

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Fourth Semester B.F.. Degree Examination, Dee.2019/Jan.2020
Applied Thermodynamics
Time: 3 hrs. Max. Marks: 100
Note: 1. Answer any FIVE full questions, choosing ONE full question from each module.

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2. Use of thermodynamics data hand book is permitted.
c'
a.
Module-1
1 a. Show the compression ratio (r

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e
) for maximum work should be per kg of air in an Otto cycle
L '
3
( \ 2(7-1)

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between upper and lower limits of absolute temperature T3 and T3 is given r
(
.
1)
and also show that T

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2
T
4
= (T, T
3

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)
1 2
(10 Marks)
Compression ratio of diesel cycle is 14 and cut off ratio is 2.2 at beginning of cycle, air is
0.98 bar and 100?C. Find: (i) The temperature and pressure at salient points

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(ii) Air standard efficiency. (10 Marks)
CS cci
:45
"
and the cycle efficiency. Assume the value of Cp = 1.005 kJ/kgK and y = 1.4. (10 Marks)

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:... =
7::?:.
- i
Module-2 ,
a

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3 a. Discuss with the help of T-S diagram the effect of Boiler pressure, condenser pressure and
,;- ..
o.
3-
= ?

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super heat on the performance of a Rankine cycle. (10 Marks)

?
o.,
o cz

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b. A 40 MW steam power plant working on Rankine cycle operator between boiler pressure of
C.) d'
e .9-
40 bar and condenser pressure of 0.1 bar. Steam leaves the boiler and enters the turbine at

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400?C. The isentropic efficiency of steam turbine is 84%. Determine:
g i
i) Efficiency ii) Quality of exhaust iii) Steam flow rate in kg/hr.
. .
(10 Marks)

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- -o
>,
= WI
?
?

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a
w

E '>
o ?.. .).

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8

?
Q.)
0

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z
0
0.
= e' I
7

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; F
-1)

OR
. .

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?
T.
2 a. With a neat sketch, explain the working of Ramjet. (10 Marks)
E . 5
b.

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In an open cycle gas turbine plant, air enters the compressor at I bar and 27?C. The pressure
r
A
0 1 after compression is 4 bar. The isentropic efficiencies of the turbine and the compressor are
(-)

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(
L
)

8

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85% and 80% respectively. Air fuel ratio is 80:1 calorific value of the fuel used is
? ?
? .0 42000 kJ/kg. Mass flow rate of air is 2.5 kg/sec. Determine the power output from the plant
to =
OR

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4 a. A steam power plant operates on a theoretical reheat cycle. Steam at boiler outlet 150 bar,
550?C expands through the high pressure turbine. It is reheated at a constant pressure of 40
bar to 550?C and expands through the low pressure turbine to a condenser at 0.1 bar. Draw
T-S and h-s diagrams. Find:
(i) Quality of steam at turbine exhaust

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(ii) Cycle efficiency
(iii) Steam rate in kg/KWh. (10 Marks)
b. With the help of neat diagram, explain the working of regenerative Rankine cycle and derive
the efficiency of the cycle. (10 Marks)
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USN

17ME43

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Fourth Semester B.F.. Degree Examination, Dee.2019/Jan.2020
Applied Thermodynamics
Time: 3 hrs. Max. Marks: 100
Note: 1. Answer any FIVE full questions, choosing ONE full question from each module.

--- Content provided by FirstRanker.com ---

2. Use of thermodynamics data hand book is permitted.
c'
a.
Module-1
1 a. Show the compression ratio (r

--- Content provided by FirstRanker.com ---

e
) for maximum work should be per kg of air in an Otto cycle
L '
3
( \ 2(7-1)

--- Content provided by FirstRanker.com ---

between upper and lower limits of absolute temperature T3 and T3 is given r
(
.
1)
and also show that T

--- Content provided by​ FirstRanker.com ---

2
T
4
= (T, T
3

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)
1 2
(10 Marks)
Compression ratio of diesel cycle is 14 and cut off ratio is 2.2 at beginning of cycle, air is
0.98 bar and 100?C. Find: (i) The temperature and pressure at salient points

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(ii) Air standard efficiency. (10 Marks)
CS cci
:45
"
and the cycle efficiency. Assume the value of Cp = 1.005 kJ/kgK and y = 1.4. (10 Marks)

--- Content provided by‍ FirstRanker.com ---

:... =
7::?:.
- i
Module-2 ,
a

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3 a. Discuss with the help of T-S diagram the effect of Boiler pressure, condenser pressure and
,;- ..
o.
3-
= ?

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super heat on the performance of a Rankine cycle. (10 Marks)

?
o.,
o cz

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b. A 40 MW steam power plant working on Rankine cycle operator between boiler pressure of
C.) d'
e .9-
40 bar and condenser pressure of 0.1 bar. Steam leaves the boiler and enters the turbine at

--- Content provided by​ FirstRanker.com ---

400?C. The isentropic efficiency of steam turbine is 84%. Determine:
g i
i) Efficiency ii) Quality of exhaust iii) Steam flow rate in kg/hr.
. .
(10 Marks)

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- -o
>,
= WI
?
?

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a
w

E '>
o ?.. .).

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8

?
Q.)
0

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z
0
0.
= e' I
7

--- Content provided by FirstRanker.com ---

; F
-1)

OR
. .

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?
T.
2 a. With a neat sketch, explain the working of Ramjet. (10 Marks)
E . 5
b.

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In an open cycle gas turbine plant, air enters the compressor at I bar and 27?C. The pressure
r
A
0 1 after compression is 4 bar. The isentropic efficiencies of the turbine and the compressor are
(-)

--- Content provided by‍ FirstRanker.com ---

(
L
)

8

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85% and 80% respectively. Air fuel ratio is 80:1 calorific value of the fuel used is
? ?
? .0 42000 kJ/kg. Mass flow rate of air is 2.5 kg/sec. Determine the power output from the plant
to =
OR

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4 a. A steam power plant operates on a theoretical reheat cycle. Steam at boiler outlet 150 bar,
550?C expands through the high pressure turbine. It is reheated at a constant pressure of 40
bar to 550?C and expands through the low pressure turbine to a condenser at 0.1 bar. Draw
T-S and h-s diagrams. Find:
(i) Quality of steam at turbine exhaust

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(ii) Cycle efficiency
(iii) Steam rate in kg/KWh. (10 Marks)
b. With the help of neat diagram, explain the working of regenerative Rankine cycle and derive
the efficiency of the cycle. (10 Marks)
17N.

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Module-3
5 a. Explain the following terms with reference to a combustion process:
(i) Adaibatic flame temperature
(ii) Enthalpy of formation
(iii) Stoichiometric air

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(iv) Enthalpy of combustion
(v) Combustion efficiency (10 Marks)
b. Methane (CH4) is burned with atmospheric air. The analysis of the products on a dry basis is
as follows: CO2 = 10%, 02 = 2.37%, CO = 0.53%, N2 = 87.10%.
(i) Determine the combustion equation

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(ii) Calculate the air-fuel ratio
(iii) Percent theoretical air (10 Marks)
OR
6 a. Explain the following:
(i) Heat balance sheet

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(ii) Morse test (10 Marks)
b. A single cylinder 4-stroke diesel engine give the following results while running on full
load, area of indicator diagram = 300 mm
2
, length of diagram = 40 mm. The spring

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constant = 1 bar/nun, speed of the engine = 400 rpm, load on the brake = 370 N, spring
balance reading = 50 N, diameter of brake drum = 1.2 m, fuel consumption = 2.8 kg/hr,
calorific value fuel = 41800 kJ/kg, diameter of cylinder = 160 mm, stroke = 200 mm.
Calculate IP, BP, Brake mean effective pressure, brake specific fuel consumption, brake
thermal efficiency, indicator thermal efficiency. (10 Marks)

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Module-4
7 a. With a neat sketch, describe clearly the working of a Bell-Coleman cycle. (06 Marks)
b. Write a brief note on properties of refrigerants. (04 Marks)
C. For food-storage purpose, a refrigeration plant of 10.5 TR is required at an evaporation
temperature of ?12?C and condenser temperature of 27?C. The refrigerant is ammonia. It is

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sub-cooled by 6?C before entering the expansion valve. The vapour is 0.95 dry as it leaves
the evaporator coil. The compression is adiabatic using p-h chart. Calculate:
(i) Condition of vapour at outlet of the compressor
(ii) Condition of vapour at entrance to evaporator
(iii) CoP

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(iv) Power required in KW.
Neglect throttling and clearance effect. (10 Marks)
OR
8 a. Define the following:
(i) Dry bulb temperature (ii) Dew point temperature

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(iii) Relative humidity (iv) Specific humidity
(v) Degree of saturation (10 Marks)
b. An air-conditioning plant is to be designed for a small office for winter conditions. Outdoor
condition = 10?C DBT and 8?C WBT. Required indoor conditions = 20?C DBT and 60%
RH. Amount of air circulation = 0.3 m

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3
/min/person seating capacity of the office = 50. The
required condition is achieved first by heating and then by adiabatic humidifying. Find the
followings:
(i) Heating capacity of the coil in KW and the surface temperature required if the bypass

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factor of the coil is 0.32
?
(ii) The capacity of the humidifier. 4.-
- nr
(10 Marks)

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2 of 3
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USN

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17ME43

Fourth Semester B.F.. Degree Examination, Dee.2019/Jan.2020
Applied Thermodynamics

--- Content provided by‌ FirstRanker.com ---

Time: 3 hrs. Max. Marks: 100
Note: 1. Answer any FIVE full questions, choosing ONE full question from each module.
2. Use of thermodynamics data hand book is permitted.
c'
a.

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Module-1
1 a. Show the compression ratio (r
e
) for maximum work should be per kg of air in an Otto cycle
L '

--- Content provided by‍ FirstRanker.com ---

3
( \ 2(7-1)
between upper and lower limits of absolute temperature T3 and T3 is given r
(
.

--- Content provided by‌ FirstRanker.com ---

1)
and also show that T
2
T
4

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= (T, T
3
)
1 2
(10 Marks)

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Compression ratio of diesel cycle is 14 and cut off ratio is 2.2 at beginning of cycle, air is
0.98 bar and 100?C. Find: (i) The temperature and pressure at salient points
(ii) Air standard efficiency. (10 Marks)
CS cci
:45

--- Content provided by‌ FirstRanker.com ---

"
and the cycle efficiency. Assume the value of Cp = 1.005 kJ/kgK and y = 1.4. (10 Marks)
:... =
7::?:.
- i

--- Content provided by⁠ FirstRanker.com ---

Module-2 ,
a
3 a. Discuss with the help of T-S diagram the effect of Boiler pressure, condenser pressure and
,;- ..
o.

--- Content provided by⁠ FirstRanker.com ---

3-
= ?
super heat on the performance of a Rankine cycle. (10 Marks)

?

--- Content provided by​ FirstRanker.com ---

o.,
o cz
b. A 40 MW steam power plant working on Rankine cycle operator between boiler pressure of
C.) d'
e .9-

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40 bar and condenser pressure of 0.1 bar. Steam leaves the boiler and enters the turbine at

400?C. The isentropic efficiency of steam turbine is 84%. Determine:
g i
i) Efficiency ii) Quality of exhaust iii) Steam flow rate in kg/hr.

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. .
(10 Marks)
- -o
>,
= WI

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?
?
a
w

--- Content provided by​ FirstRanker.com ---

E '>
o ?.. .).
8

?

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Q.)
0
z
0
0.

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= e' I
7
; F
-1)

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OR
. .
?
T.
2 a. With a neat sketch, explain the working of Ramjet. (10 Marks)

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E . 5
b.
In an open cycle gas turbine plant, air enters the compressor at I bar and 27?C. The pressure
r
A

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0 1 after compression is 4 bar. The isentropic efficiencies of the turbine and the compressor are
(-)
(
L
)

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8
85% and 80% respectively. Air fuel ratio is 80:1 calorific value of the fuel used is
? ?
? .0 42000 kJ/kg. Mass flow rate of air is 2.5 kg/sec. Determine the power output from the plant

--- Content provided by​ FirstRanker.com ---

to =
OR
4 a. A steam power plant operates on a theoretical reheat cycle. Steam at boiler outlet 150 bar,
550?C expands through the high pressure turbine. It is reheated at a constant pressure of 40
bar to 550?C and expands through the low pressure turbine to a condenser at 0.1 bar. Draw

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T-S and h-s diagrams. Find:
(i) Quality of steam at turbine exhaust
(ii) Cycle efficiency
(iii) Steam rate in kg/KWh. (10 Marks)
b. With the help of neat diagram, explain the working of regenerative Rankine cycle and derive

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the efficiency of the cycle. (10 Marks)
17N.
Module-3
5 a. Explain the following terms with reference to a combustion process:
(i) Adaibatic flame temperature

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(ii) Enthalpy of formation
(iii) Stoichiometric air
(iv) Enthalpy of combustion
(v) Combustion efficiency (10 Marks)
b. Methane (CH4) is burned with atmospheric air. The analysis of the products on a dry basis is

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as follows: CO2 = 10%, 02 = 2.37%, CO = 0.53%, N2 = 87.10%.
(i) Determine the combustion equation
(ii) Calculate the air-fuel ratio
(iii) Percent theoretical air (10 Marks)
OR

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6 a. Explain the following:
(i) Heat balance sheet
(ii) Morse test (10 Marks)
b. A single cylinder 4-stroke diesel engine give the following results while running on full
load, area of indicator diagram = 300 mm

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2
, length of diagram = 40 mm. The spring
constant = 1 bar/nun, speed of the engine = 400 rpm, load on the brake = 370 N, spring
balance reading = 50 N, diameter of brake drum = 1.2 m, fuel consumption = 2.8 kg/hr,
calorific value fuel = 41800 kJ/kg, diameter of cylinder = 160 mm, stroke = 200 mm.

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Calculate IP, BP, Brake mean effective pressure, brake specific fuel consumption, brake
thermal efficiency, indicator thermal efficiency. (10 Marks)
Module-4
7 a. With a neat sketch, describe clearly the working of a Bell-Coleman cycle. (06 Marks)
b. Write a brief note on properties of refrigerants. (04 Marks)

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C. For food-storage purpose, a refrigeration plant of 10.5 TR is required at an evaporation
temperature of ?12?C and condenser temperature of 27?C. The refrigerant is ammonia. It is
sub-cooled by 6?C before entering the expansion valve. The vapour is 0.95 dry as it leaves
the evaporator coil. The compression is adiabatic using p-h chart. Calculate:
(i) Condition of vapour at outlet of the compressor

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(ii) Condition of vapour at entrance to evaporator
(iii) CoP
(iv) Power required in KW.
Neglect throttling and clearance effect. (10 Marks)
OR

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8 a. Define the following:
(i) Dry bulb temperature (ii) Dew point temperature
(iii) Relative humidity (iv) Specific humidity
(v) Degree of saturation (10 Marks)
b. An air-conditioning plant is to be designed for a small office for winter conditions. Outdoor

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condition = 10?C DBT and 8?C WBT. Required indoor conditions = 20?C DBT and 60%
RH. Amount of air circulation = 0.3 m
3
/min/person seating capacity of the office = 50. The
required condition is achieved first by heating and then by adiabatic humidifying. Find the

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followings:
(i) Heating capacity of the coil in KW and the surface temperature required if the bypass
factor of the coil is 0.32
?
(ii) The capacity of the humidifier. 4.-

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- nr
(10 Marks)
2 of 3
17ME43
Module-5

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9 a. Define the following with respect to a compressor:
i) Isothermal efficiency ii) Adiabatic efficiency iii) Mechanical efficiency
iv) Overall efficiency v) Volumetric efficiency (10 Marks)
b. An air compressor takes in air at 1 bar and 20?C and compresses the same according to the
law PV'

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.-
= C. It is the delivered to a receiver at a constant pressure of 10 bar.
Determine:
(i) Temperature at the end of compression
(ii) Work done and heat transferred during compression per kg of air R ? 0.287 kJ/kgK.

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(10 Marks)
OR
10 a. Prove the maximum flow rate of steam per unit area through a nozzle occurs when the ratio
- I
of pressure at throat to the inlet pressure is equal to P

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2
/ P, = where n is polytropic
n +1)
n

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index of expansion. (10 Marks)
b. Dry saturated steam at a pressure of 11 bar enters a convergent divergent nozzle and leaves
at a pressure of 2 bar. If the flow is adiabatic frictionless. Determine: (i) Exit velocity of
steam (ii) Ratio of cross-section area at exit and at throat. Assume the index of adiabatic
expansion to be 1.135. (10 Marks)

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3 of 3
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