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Theoretical & Derivation based Questions and Answer
Unit 01
1. Derive the condition for exact differentials.
Solution:
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2*. Derive the Maxwell relations and explain their importance in thermodynamics.
Solution:
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3. Starting from 1st Maxwell relation and using cyclic relation, derive remaining three
relations.
Solution:
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http://ajourneywithtime.weebly.com/ats.html By M. K. PODDAR, A.P, IIT GZB.
4*. Derive the equation for Clausius – Clapeyron equation for evaporation of liquids.
Answer: Refers class notes
5*. Explain the following
(a) Coefficient of volume expansion
(b) Joule Thomson coefficient
(c) Isothermal compressibility.
Answer: Refers class notes
6*. Explain the following
a) What are primary fuels and secondary fuels? List some important primary and secondary
fuels.
b) What do you mean by stoichiometric air-fueln(A/F) ratio?
c) Enthalpy of formation (ΔHf)
d) Heating values of fuel
e) Adiabatic Flame Temperature
Answer: Refers class notes
For Numericals
Refers class notes and solve previous year numerical questions
Unit 2:
7. Classify the boiler briefly.
Answer: Refers class notes
8*. Give the name of various mountings and accessories of boiler and also explain its functions.
Answer: Refers class notes
9. What are the elements of steam condensing plant? Explain its function briefly. Answer: Refers class notes
10. State the comparison between jet and surface condenser. Answer: Refers class notes & Books
11. Explain briefly the effects of air leakage in a steam condenser?
Answer: Refers class notes
12*. Explains briefly any one jet condenser with neat sketch. Answer: Refers class notes & Books
13*. With neat sketch, explain the working of evaporative condenser. Answer: Refers class notes & Books
For Numericals
Refers class notes and solve previous year numerical questions
Unit 3
14. Explain the various operation of a vapour carnot cycle. Also represent it on a T-s
and p-v diagrams.
Answer: Refers class notes
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15*. Describe the different operation of Rankine cycle. Derive also the expression for its
efficiency. What are the effects of pressure and temperature on rankine cycle?
Answer: Refers class notes
16*. Explain the working with the help of neat diagram & also derive an expression for
its thermal efficiency. Also explain its advantages and disadvantages
(a) Reheat cycle
(b) Regenerative cycle.
(c) Binary vapour cycle.
(d) Modified Rnakine cycle
Answer: Refers class notes
17. Explain with neat sketch the construction and working of steam engine.
Answer: Refers class notes
18*. Explain clearly what do you mean by ‘saturation curve’ and missing quantity.
Suggest the ways by which missing quantity can be reduced.
Answer: Refers class notes
For Numericals
Refers class notes and solve previous year numerical questions
Unit 04
19*. Derive the expression for mass flow rate per unit area of steam in a nozzle. Also
give the condition for maximum discharge.
Answer: Refers class notes
20. Define critical pressure ratio for the nozzle of steam turbine. Obtain analytically its value
in term of index of expansion (n).
Answer: Refers class notes
21*. What do you mean by a supersaturated flow? Explain with the help of h-s diagram.
Answer: Refers book ‘Thermal engineering’ by Er. R.K Rajput, Ch-18, page no. 444
22. What is the nozzle efficiency?
Answer: it is defined as the ratio of the actual enthalpy drop to the isentropic enthalpy drop
between the same pressures.
23*. Make a comparison between impulse turbine and reaction turbine.
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24. Explain the working of a single stage impulse steam turbine. Sketch the pressure
and velocity variations along the axis of the turbine.
Answer:
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25. Draw the velocity vector diagram of a single stage impulse turbine and set up
expression for the axial thrust, tangential force, work done and diagram efficiency.
Answer: Refers class notes
26*. Why compounding is done in steam turbine? Discuss the various methods of compounding
steam turbine. Also discuss its salient features.
Answer: Refers class notes
27*. Derive the condition for maximum efficiency of single stage impulse turbine and
write its expression. Also plot efficiency vs blade speed ratio.
Answer: Refers class notes
28**. Explain various methods used for governing of steam turbines.
Answer:
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http://ajourneywithtime.weebly.com/ats.html By M. K. PODDAR, A.P, IIT GZB.
For Numericals
Refers class notes and solve previous year numerical questions
For steam turbine problem prefer 1st manual approach it time permits them go for 2
nd method
graphical approach.
Unit 5 29. What is the difference between gas turbine Vs Steam turbine?
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30*. Derive an expression for the air standard thermal efficiency of the Brayton cycle in
terms of the compression ratio and adiabatic index.
Solution:
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31*. Prove that the optimal pressure ratio for maximum specific output for a gas
turbine plant is given by rp= (T3/T1)γ/2(γ-1)
, where T3 and T1 is the maximum and
minimum temperate. or
For a constant pressure closed cycle gas turbine, derive the mathematical Expression of
optimum pressure ratio for maximum cycle thermal efficiency
Solution: Up to work done do same as Q. no. 30, rearrange workdone in term of pressure ratio
& differentiat it w.r . to pressure ratio & equate it to zero. For detail Refers class notes
32*. Discuss the influence of reheating, regeneration and intercooling on the
performance of a gas turbine cycle.
Answer: Refers class notes
33**. Explain with a neat sketch the working of
(a) Turbojet engine (b) Turbo-prop engine (c) Rocket Engine
Also discuss its application & advatages
For Numericals
Refers class notes and solve previous year numerical questions
Solve both numerical of closed cycle gas turbine and open cycle gas turbine
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