Heat And Mass Transfer (KME-501) - AKTU Question Paper 2021-22
B.Tech · Semester 5 · Free PDF Download
This is the official AKTU Heat And Mass Transfer Previous Year Question Paper for B.Tech Semester 5, academic session 2021-22. Published by Dr. A.P.J. Abdul Kalam Technical University (AKTU/UPTU), Lucknow. Free PDF download — no login required.
Course:B.Tech
Semester:Semester 5
Session:2021-22
University:AKTU / UPTU
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Questions Asked in 2021-22
Heat And Mass Transfer (KME-501) — complete question paper
Section AAttempt all q u e s t i o n s i n b r i e f . 2 x 10 = 20
- aWhat is the difference betw een thermodynamics and heat transfer? 2 1
- bHow the thermal conductivity of mat erial is defined? What are its units? 2 1
- cWhat is meant by transient heat conduction? 2 2
- dExplain effectiveness and efficiency of fin. 2 2
- eWhat is turbulent flow? Define it. 2 3
- fDefine Reynolds’s number, also write the significance of Reyno lds’s number
- gDefine Stefan Boltzmann’s law. 2 4
- hExplain black body, opaque body, white body and grey body also . 2 4 i. How heat exchangers are classified? 2 5 j. What are the various modes of mass transfer? 2 5
Section BAttempt any three o f t h e f o l l o w i n g :
- aDrive an expression for heat conduction through a composite wall. 10 1
- bIt is required to heat oil to about 300°C for frying purpose . A ladle is used in the frying. The section of the handle is 5 mm x 18 mm. the surroundings are at 30°C. The conductivity of the material is 2 05 W/m°C. If the temperature at a distance of 380 mm from the oil should not reach 40°C, Determine the convective heat transfer coefficient
- cDifferentiate between:- (i) Natural and forced convection. (ii) Hydrodynamic and thermal boundary layer thickness
- dA 70 mm long circular surface of a circular hole of 35 mm di ameter maintained at uniform temperature of 250°C. Find the loss of en ergy to the surroundings at 27°C, assuming the two ends of the hole to be as parallel discs and the metallic surfaces and surroundings have a black body characteristics
- eDerive an expression for eff ectiveness by NTU method for parallel flow. 10 5
Section CAttempt any one p a r t o f t h e f o l l o w i n g :
- aDerive a general heat conducti on equation for Cartesian co-o rdinate. And also draw the temperature-thickness profile for it
- bA mild steel tank of thickness 12 mm contains water at 95 oC. The thermal conductivity of mild steel is 50 W/m°C, and the heat tr ansfer coefficients for the inside and outside the tank are 2850 and 10 W/m2 oC, respectively. If the atmospheric temperature is 15 oC, calculate: (i) The rate of heat loss per square meter of the tank surface area. (ii) The temperature of the outside surface of the tank
- aAn aluminium alloy plate of 400 mm x 400 mm x 4mm size at 20 0 oC is suddenly quenched into liquid oxygen at -183oC. Starting from fundamentals or deriving the necessary expression to determine the time required for the plate to reach a temperature of -70 o C . A s s u m e h = 20000 KJ/m2 h oC, cp = 0.8 KJ/Kg oC and density = 3000 Kg/m3
- bProve that for a body whose ther mal resistance is zero, the temperature required for cooling or heating can be obtained from the relation (t-ta)/(ti-ta ) = exp[-Bi Fa ] Where the symbols have their usual meanings
- aA nuclear reactor with its core constructed of parallel vert ical plates of 2.2 m high and 1.4 m wide has been designed on free convection heating of liquid bismuth. The maximum temperature of the plate surface i s limited to 960°C while the lowest allowable temperature of the bismuth is 340°C. Calculate the maximum possible heat dissipation from the both sides of each plate. For the convection coefficient for the plate is Where different parameter are evaluated at the mean film temperature
- bAir at 20°C flowing over a flat plate which is 200 mm wide a nd 500 mm long. The plate is maintained at 100°C. Find the heat loss p er hour from the plate f the air is flowing parallel to 500 mm side with 2 m/s velocity. What will be the effect on heat transfer if the f low is parallel to 200 mm? The properties of air at (100+20)/2 = 60°C are ν = 18.97 × 10-6 m2/s, k = 0.025W/m°C and Pr = 0.7
- aDetermine the radiant heat exchanger in W/ m 2 between two large parallel steel plates of emissivity’s 0.8 and 0.5 held at tempe rature of 1000 k and 500k respectively, if a thin copper plate of emissi vity 0.1 is introduced as a radiation shield between the two plates. Use σ =
- bDerive the expression for net heat exchange between black bo dies for infinite parallel planes
- aThe flow rates of hot and cold water streams running through a parallel flow heat exchangers are 0.2 Kg/s and 0.5 Kg/s respectively the inlet a temperatures 75°c and 20°c respectively. The exit temperature o f hot water is 45°c. If the individual heat transfer coefficient on b oth sides are 650 W/m2°C. Calculate: (i) The area of heat exchanger. (ii) the rate of heat transfer
- bDifferentiate between the mechanisms of filmwise and dropwis e condensation
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 — KME-501
Questions that appeared in more than one session, found by comparing 3 years of Heat And Mass Transfer papers (2021-22, 2022-23, 2023-24)
2x
Explain effectiveness and efficiency of fin. 2 2
Appeared in: 2021-22 · 2023-24
2x
Derive an expression for eff ectiveness by NTU method for parallel flow. 10 5
Appeared in: 2021-22 · 2023-24
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