B.TechSemester 42024-25Applied ThermodynamicsBME401

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) — complete question paper · 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

a
State the difference between Otto and Diesel cycles
b
What is the effect of superhea ting on the efficiency of the Rankine cycle?
c
Define Higher Heating Value (HHV) and Lower Heating Value (LHV )
d
Name two boiler mountings and two accessories
e
What is choked flow in a nozzle?
f
Differentiate between impulse and reaction turbines
g
List 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

a
The 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
b
In 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
c
Explain the working of a surface condenser with a neat sketc h. Discuss the impact of air leakage on condenser performance
d
Derive the expression for maximum mass flow rate per unit ar ea in a convergent nozzle. Define nozzle efficiency
e
Explain 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

a
In an air standard Diesel cycle, the compression ratio is 16 and cut-off ratio is 2.5. Calculate the thermal efficiency
b
Explain the working of a turbocharger with a neat diagram. H ow does it differ from a supercharger?
a
The 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
b
Derive the expression for adiabatic flame temperature for co nstant pressure combustion
a
Define 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
b
Explain working of feed water heater and superheater in a bo iler. How do they improve boiler efficiency?
a
Draw a velocity diagram for a single-stage impulse turbine. Derive expressions for work done and blade efficiency
b
In 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
a
the blade angles at inlet and outlet if the steam enters blades smoothly and leaves axially
b
the blade efficiency
c
the power developed in kW
a
Air 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
b
Explain 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. Hindi translations are omitted — every question is printed in English in the original paper. Last verified: 2026-08-23.

Repeated Questions — BME401

Questions that appeared in more than one session, found by comparing 3 years of Applied Thermodynamics papers (2023-24, 2024-25, 2025-26)

In 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

Appeared in: 2023-24 · 2024-25

the blade angles at inlet and outlet if the steam enters blades smoothly and leaves axially

Appeared in: 2023-24 · 2024-25

the blade efficiency

Appeared in: 2023-24 · 2024-25

the power developed in kW

Appeared in: 2023-24 · 2024-25

Applied Thermodynamics — Other Year Papers

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