Download PTU (I.K. Gujral Punjab Technical University Jalandhar (IKGPTU) ) BE/BTech ME (Mechanical Engineering) 2020 March 4th Sem Applied Thermodynamics Ii Previous Question Paper
1 | M-59016 (S2)-2832
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Tech (ME) (Sem.?4)
APPLIED THERMODYNAMICS-II
Subject Code : ME-208
M.Code : 59016
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
Q1. Write briefly :
a) Sketch a typical port timing diagram of a two stroke petrol engine.
b) What is the need of pre .combustion chamber in D.I. Diesel engine?
c) Explain what is work input factor in centrifugal compressors?
d) Explain the advantages of Ram jet propulsion system.
e) List the positive displacement type compressors of rotary design.
f) Give comparison between reciprocating and rotary air compressors.
g) Enlist different methods to improve thermal efficiency of open cycle gas turbine plant.
h) List down merits of gas turbine over steam turbine.
i) Give the classification of rotary compressors.
j) Differentiate between Turbojet and Turboprop.
SECTION-B
Q2 List out the factors affecting knocking in S.I. engine & explain these briefly.
Q3 Explain working of Vane type Blower, also calculate the Power input.
Q4 Define ?Slip?factor in relation to Centrifugal compressor and derive an expression.
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1 | M-59016 (S2)-2832
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Tech (ME) (Sem.?4)
APPLIED THERMODYNAMICS-II
Subject Code : ME-208
M.Code : 59016
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
Q1. Write briefly :
a) Sketch a typical port timing diagram of a two stroke petrol engine.
b) What is the need of pre .combustion chamber in D.I. Diesel engine?
c) Explain what is work input factor in centrifugal compressors?
d) Explain the advantages of Ram jet propulsion system.
e) List the positive displacement type compressors of rotary design.
f) Give comparison between reciprocating and rotary air compressors.
g) Enlist different methods to improve thermal efficiency of open cycle gas turbine plant.
h) List down merits of gas turbine over steam turbine.
i) Give the classification of rotary compressors.
j) Differentiate between Turbojet and Turboprop.
SECTION-B
Q2 List out the factors affecting knocking in S.I. engine & explain these briefly.
Q3 Explain working of Vane type Blower, also calculate the Power input.
Q4 Define ?Slip?factor in relation to Centrifugal compressor and derive an expression.
2 | M-59016 (S2)-2832
Q5 Derive an expression for Optimum Pressure Ratio for maximum specific work output of
gas turbine plant.
Q6 Explain with neat diagram, working of Turbo-propeller engine.
SECTION-C
Q7 A Centrifugal compressor running at 10000 r.p.m., delivers 660m
3
/min. of free air. The air
is compressed from 1 bar and 20?C to a pressure ratio of 4 with isentropic efficiency of
82%. Blades are radial at outlet of impeller and flow velocity of 62m/s may be assumed
throughout constant. The outer radius of impeller is twice the inner and slip factor may be
assumed as 0.9. The blade area co-efficient may be assumed 0.9 at inlet. Calculate :
a) Final temperature of air
b) Theoretical power
c) Impeller diameters at inlet and exit
d) Breadth of impeller at inlet
e) Diffuser blade angle at inlet
Q8 A jet propulsion unit uses 35kg of air per second when flying at 800km/hr. The air is
compressed from 15?C and 1 bar to 182?C and 309 bar. The temperatures of gases entering
and leaving the turbine are 815?C and 650?C and then it enters into the nozzle. Assuming
the isentropic efficiency of compressor and turbine is same and nozzle efficiency 90%.
Neglecting the effect of ramming and fuel mass, find the following :
a) Isentropic efficiency of compressor and turbine
b) Power required to run the compressor and
c) Thrust produced
Q9 Write short notes on :
a) Supercharging of I C engines.
b) Explain briefly : lift and drag, surging and choking in Axial flow compressors.
c) Application of Steady flow Energy equation Thermodynamics of rotary compressors.
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