Download PTU (I.K. Gujral Punjab Technical University Jalandhar (IKGPTU) ) BE/BTech ME (Mechanical Engineering) 2020 March 6th Sem Applied Thermodynamics Previous Question Paper
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Tech. (ME) (Sem.?6)
APPLIED THERMODYNAMICS
Subject Code : ME-209
M.Code : 59005
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.
SECTION-A
1. Write briefly :
(a) Differentiate between water tube and fire tube boilers.
(b) Explain the difference between Impulse & Reaction turbines.
(c) Define Dalton?s law of partial pressure. How it is applicable on steam condensers?
d) Write note on Labyrnth packing, why it is used in steam turbines.
(e) Discuss the effects of air leakage in-condensers.
(f) Write note on Isothermal and polytrophic efficiency of reciprocating compressors.
(g) Define stage efficiency and overall efficiency.
(h) What is reheat cycle discuss?
(i) What is function of economizer in boiler?
(j) What is Degree of Reaction? Explain.
SECTION-B
2. The fuel supplied to an I.C. engine has the following composition by mass : C = 87% and
H
2
= 13%. The air : fuel ratio is 13:1. If all the carbon is burnt either to CO or CO
2
, and if
there is no free oxygen in the combustion products, determine: Volumetric analysis of
products of combustion.
3. Explain Rakine cycle. Derive expression for work output and efficiency of the cycle.
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1 | M-59005 (S2)-2755
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Tech. (ME) (Sem.?6)
APPLIED THERMODYNAMICS
Subject Code : ME-209
M.Code : 59005
Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.
SECTION-A
1. Write briefly :
(a) Differentiate between water tube and fire tube boilers.
(b) Explain the difference between Impulse & Reaction turbines.
(c) Define Dalton?s law of partial pressure. How it is applicable on steam condensers?
d) Write note on Labyrnth packing, why it is used in steam turbines.
(e) Discuss the effects of air leakage in-condensers.
(f) Write note on Isothermal and polytrophic efficiency of reciprocating compressors.
(g) Define stage efficiency and overall efficiency.
(h) What is reheat cycle discuss?
(i) What is function of economizer in boiler?
(j) What is Degree of Reaction? Explain.
SECTION-B
2. The fuel supplied to an I.C. engine has the following composition by mass : C = 87% and
H
2
= 13%. The air : fuel ratio is 13:1. If all the carbon is burnt either to CO or CO
2
, and if
there is no free oxygen in the combustion products, determine: Volumetric analysis of
products of combustion.
3. Explain Rakine cycle. Derive expression for work output and efficiency of the cycle.
2 | M-59005 (S2)-2755
4. How does a condenser employed in steam power plant improves the performance.
Differentiate between Jet and surface condensers.
5. Explain the effect of friction in nozzle performance, also evaluate nozzle efficiency and
coefficient of velocity, write values of C
v
for various nozzles.
6. What is the need of multi stage compression; derive an expression for work input for
multi-stage compression with perfect inter cooling in intermediate stages.
SECTION-C
7. A five stage steam turbine has steam entering at 20 bar, 300?C and leaving at 0.05 bar
and 0.95 dry. Determine the Reheat factor, condition of steam at exit from each stage
considering efficiency ratio ( ?
s
) = 0.555 and all stages doing equal work.
8. a) Explain the principle of working of Parson Reaction Turbine.
b) The blade speed of single ring of impulse blading is 300m/s and the nozzle angle is
20?. The isentropic heat drop is 475kJ/kg and the nozzle efficiency is 0.85. Given that
blade velocity coefficient is 0.7 and blades are symmetrical, draw vector diagrams
and calculate for a mass flow rate of l kg/s :
i) axial thrust on blading,
ii) diagram efficiency and maximum blade efficiency
iii) heat equivalent of friction of blading.
9. A two stage single acting compressor takes in air at the rate of 0.2m
3
/s. The intake
pressure and temperature of air are 0.1MPa and 16?C. The air is compressed to a final
pressure of 0.7MPa. The inter cooling is perfect and the intermediate pressure is for
minimum work input conditions. The compression index in both the stages is 1.25 and
compressor runs at 600r.p.m. Neglecting clearance, determine :
a) intermediate pressure,
b) total volume of each cylinder,
c) the ower required to drive compressor and total heat rejected in intercooler.
Take C
p
= 1.005kJ/kg K and R = 0.287 kJ/kg K.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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This post was last modified on 21 March 2020