Download SGBAU (Sant Gadge Baba Amravati university) B-Tech/BE (Bachelor of Technology) 3rd Sem Applied Thermodynamics Previous Question Paper
B.Tech. Third Semester (F ood, Pulp. & Paper, Oil & Paint, Petro Tech.) (CGS)
11004 : Applied Thermodynamics
3 CT 04
AW - 3003
Time : Three Hours lmyluml! Max. Marks : 80
Notes :
a)
b)
b)
b)
AW - 3003 l P.T.O
1 Answer three question from Section A and three question from Section B.
2 Due credit will be given to neatncss and adequate dimensions.
3. Assume suitable data wherever necessary.
4. Retain the construction lines.
5 Illustrate your answer necessary with the help of neat sketches.
6 Use of slide rule logarithmic tables, Steam tables, Mollier?s Chart, Drawing
instrument, Thermodynamic table for moist air, Psychrometric Charts and
Refrigeration charts is permitted.
7. Use of pen Blue/Black ink/re?ll only for writing the answer book.
SECTION - A
What is an isothermal process ? Derive an expression for the work dohc during an
isothermal process.
State the ?rst law of thermodynamics and prove that for non-?ow process, it leads to the
energy equation Q = Ag + W .
OR
What are the limitations of ?rst law thermodynamics ? Explain the second law of
thermodynamics.
A ?uid system undergoes a non-?ow frictionless process following the pressure volume
relation, p = 2 +1.5 , where 'p' is in bar and v is in m3. During the process volume changes
V
from 0.15 m3 to 0.05 m3 and system rejects 45 k] of heat, determine,
i) Change in internal energy ii) Change in enthalpy
Lay down the procedure for determination of minimum air required for complete
combustion of coal.
Describe with the help of neat sketch 'Bomb Calorimeter'.
OR
A steam boiler uses pulverized coal in the furnace. The ultimate analysis of coal (by mass)
as received is : C 78%, H2 3%, 02 3%, S 1%, ash 10% and moisture 5%.
Excess air supplied is 30%.
Calculate the mass of air to be supplied and mass of gaseous product formed per kg of
coal burnt.
What are the advantages and disadvantages of mechanical draught ?
Explain the working with neat sketch of "High Steam low water safety Valve".
OR
13
6. a)
b)
7. a)
b)
8. a)
b)
9. a)
b)
10. a)
b)
11. a)
b)
12. a)
b)
AW - 3003
Differentiate water tube boiler with ?re tube boiler.
Calculate the mass of the ?ue gases ?owing through the chimney when the draught
produced is equal to 1.9 cm of water. Temperature of ?ue gases is 290?C and ambient
temperature is 20?C. the ?ue gages formed per kg of fuel burnt are 23 kg. Neglect the losses
and take the diameter ofthe chimney as 1.8 m.
SECTION - B
Explain with neat sketch :
i) Cut-off governing ii) Ejector condenser
How and why does the hypothetical indicator diagram differ from actual indicator diagram?
0R
State the advantages of compound steam engine.
Calculate the indicated power and steam consumption in kg/hr of a double acting steam
engine from the following data :
Diameter of cylinder = 300 mm ;
Stroke == 450 mm ; RPM = 120 ; Steam pressure 7 bar and 0.9 dry ;
back pressure = 1.2 bar, cut - off takes place at 32% of stroke for both ends.
Draw the electrical circuit used for battery ignition in a four stroke four cylinder engines.
Explain the function of each component.
List the advantages and disadvantages of a two stroke cycle engine over a four stroke
engine.
OR
Explain the fuel supply system sued in petrol engine with neat sketch.
The following particulars refer to a two stroke engine : bore = 20 cm ; stroke = 30 cm ;
speed = 300 rpm ; Indicated m.e.p. = 275 kN/mz, Net brake load = 610 N ; diameter ofbrake
drum = 1 m ; fuel consumption 4.25 kg/hr : calori?c value of fuel 2 44000 kJ/kg.
Determine :
i) LP. ii) B.P.
iii) Mechanical ef?ciency iv) Indicated thermal ef?ciency
v) Brake thermal ef?ciency & vi) Overall ef?ciency
Draw p--.v and T-S diagram for a single stage reciprocating air compressor, without
clearance. Derive the expression for the work done when compression is -
i) isothermal and ii) isentropic
Enumeratc the application of compressed air.
OR
What do you mean by multistage compression ? State its advantages.
A single stage reciprocating compressor takes 1 m3 of air per minute at 1.013 bar and 15?C
and delivers it at 7 bar. Assuming that the law of compression is pv"35 = constant, and the
clearance is negligible, calculate the indicated power.
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This post was last modified on 10 February 2020