Applied Thermodynamics (BME401) - AKTU Question Paper 2024-25
B.Tech · Semester 4 · Free PDF Download
This is the official AKTU Applied Thermodynamics Previous Year Question Paper for B.Tech Semester 4, academic session 2024-25. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.
Course:B.Tech
Semester:Semester 4
Session:2024-25
University:AKTU / UPTU
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Questions Asked in 2024-25
Applied Thermodynamics (BME401) — extracted question text · 70 marks · 3 Hours
Section AAttempt all q u e s t i o n s i n b r i e f . 0 2 x 7 = 1 4
- aState the difference between Otto and Diesel cycles
- bWhat is the effect of superhea ting on the efficiency of the Rankine cycle?
- cDefine Higher Heating Value (HHV) and Lower Heating Value (LHV )
- dName two boiler mountings and two accessories
- eWhat is choked flow in a nozzle?
- fDifferentiate between impulse and reaction turbines
- gList two advantages of using a r egenerator in a gas turbine cycle
Section BAttempt any three o f t h e f o l l o w i n g : 0 7 x 3 = 2 1
- aThe output of an I.C. engine is measuredby a rope brake dyna mometer. The diameter of the brakepulley is 750 mm and rope diameter is 50 m m. The deadload on the tight side of the rope is 400 N and the springb alance reading is 50 N. The engine consumes 4.2 kg/hof fuel at rated speed of 1000 r.p.m. The calorific value offuel is 43900 kJ/kg. Calculate: (i) Brake specific fuel consumption, and (ii) Brake thermal efficiency
- bIn a steam turbine steam at 20 bar, 360°Cis expanded to 0.08 b a r . I t t h e n enters a condenser, where itis condensed to saturated liquid wa ter. The pump feeds backthe water into the boiler. Assume ideal processes, fi nd perkg of steam the net work and the cycle efficiency
- cExplain the working of a surface condenser with a neat sketc h. Discuss the impact of air leakage on condenser performance
- dDerive the expression for maximum mass flow rate per unit ar ea in a convergent nozzle. Define nozzle efficiency
- eExplain the working of a turbojet engine with a neat diagram
Section CAttempt any one p a r t o f t h e f o l l o w i n g : 0 7 x 1 = 0 7
- aIn an air standard Diesel cycle, the compression ratio is 16 and cut-off ratio is 2.5. Calculate the thermal efficiency
- bExplain the working of a turbocharger with a neat diagram. H ow does it differ from a supercharger?
- aThe chemical formula for alcohol is C 2H6O.Calculate the stoichiometric air/fuel ratio by mass and thepercentage composition of the pro ducts of combustion perkg of C2H6O
- bDerive the expression for adiabatic flame temperature for co nstant pressure combustion
- aDefine boiler draught. A boiler has chimney of 30 m height t o produce natural 3 K3 draught of 12 mm of water column.Ambient air temperature is 27°C and boiler furnace requires 20 kg of air per kg of fuel for completecombus tion. Determine minimum temperature of burnt gases leaving chimney
- bExplain working of feed water heater and superheater in a bo iler. How do they improve boiler efficiency?
- aDraw a velocity diagram for a single-stage impulse turbine. Derive expressions for work done and blade efficiency
- bIn a single stage impulse turbine the isentropic enthalpy dr op of 200 kJ/kg occurs in the nozzlehaving effici ency of 96% and nozzle angle o f 15°. The blade velocity coefficient is 0.96 and ratio ofblade speed to s team velocity is 0.5. The steam mass flow rate is 20 kg/s and velocity of steam enteringis 50 m/s. Determineand drawing velocity diagram
- athe blade angles at inlet and outlet if the steam enters blades smoothly and leaves axially
- bthe blade efficiency
- cthe power developed in kW
- aAir enters the compressor of a gas turbineplant operating on Brayton cycle at 101.325 kPa, 27°C. Thepressure ratio in the cycle is 6. Calcula te the maximumtemperature in the cycle and the cycle efficiency. Assum eWT = 2.5 WC , where W T and W C are the turbine and thecompressor work respectively. Take γ = 1.4
- bExplain the working of a turboprop engine with a neat diagra m . H o w i s i t different from a turbojet?
Question text is extracted from the official AKTU question paper PDF above. Check the original PDF for equations, diagrams and complete wording. Extracted: 2026-08-23.
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