Refrigeration And Air Conditioning (KME601) - AKTU Question Paper 2021-22
B.Tech · Semester 6 · Free PDF Download
This is the official AKTU Refrigeration And Air Conditioning Previous Year Question Paper for B.Tech Semester 6, 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 6
Session:2021-22
University:AKTU / UPTU
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Questions Asked in 2021-22
Refrigeration And Air Conditioning (KME601) — 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
- aA machine working on reversed C arnot Cycle operates between 30 0K and 200 K. Determine the COP when it is operated as 1. A refrigerating machine 2. A heat pump
- bList down the advantages of multistage vapor compression over single compression. 2 2
- cCompare various air cooling systems used for aircraft with the help of DART and Mach Number
- dCalculate the relative humidity and specific humidity of air a t 1 atm. pressure. Mass of dry air is 1 kg, mass of water vapor is 0.01 kg and it can hold maximum of 0.02 kg of water vapor
- eWhat the factors that affect hum an comfort? Discuss the use of comfort chart. 2 1
- fWhat is the name of refrigerant R-12 and R-729? And write the names of future refrigerants
- gWrite down the principle of the rmo electric refrigeration system. 2 3
- hExplain how ozone layer depletion occurs? What is the method t o prevent the further depletion? i. What is dry ice? And how it is prepared. 2 1 j. What is regenerative air coolin g system? Explain in brief. 2 3
Section BAttempt any three o f t h e f o l l o w i n g :
- aDefine a) Dew point temperature b) Adiabatic saturation temp erature c) Sensible Heat Factor d) Apparatus Dew point e) Dry Bulb Temperature
- bDiscuss various factors/compon ents of a cooling load imposed on air conditioning plant
- cDiscuss with the help of schematic diagram and T-s diagram t he Cascade refrigeration system. Further show that interm ediate temperature is geometric mean of upper and lower temperature limits
- dExplain with the figure Lithium Bromide water absorption system 10 3
- eDiscuss Boot- strap air evapor ative cooling system with the help schematic and T-s diagram
Section CAttempt any one p a r t o f t h e f o l l o w i n g :
- aA single compressor using R-12 as refrigerant has three evaporators of capacities 10 TR, 30 TR and 20 TR. The temperature in all the three evaporators is to be maintained at -50C. The vapors leaving the evaporators are dry and saturated. The condenser temperature is 400C. The liquid refrigerant leaving the condenser is sub cooled to 300C. Assuming isentropic compression, find the power required to drive the compressor and cop of the system
- bAn AC system is take outdoor air at 10 0C and 30% relative humidity at a steady rate of 45 m3/min and to condition it to 25 0C and 60% relative humidity. The outdoor air is first heated to 22 0C in the heating section and then humidified by the hot steam. Assuming constant pressure as 100 kPa, determine a) the rate of heat supply in the heating section b) the mass flow rate of the steam required in the humidifying section
- aAn air refrigerator working on Bell Coleman cycle takes air into the compressor at 1 bar and 268 K. It is compressed in the compressor to 5 bar and cooled to 298 K at the same pressure. It is further expanded in the expander to 1 bar and discharged to take the cooling load. The isentropic effi ciencies of the compressor and expander are 85% and 90% respectively. Determine: 1 . Refrigeration capacity of the system if the air circulated is 40 kg/min; 2. Power required for the compressor 3. COP of the system
- bAir refrigeration used for food storage provides 25TR. The t emperature of air entering the compressor is 7 0C and the temperature at exit of cooler is 27 0C. Find COP of the cycle and power per tone of refrigeration required by the compr essor. The quantity air circulated in the system is 3000 kg/h. the compression and expa nsion both follows the law pv1.3 = C and take ratio of specific heat as 1.4 and Cp = 1 kJ/kgK
- aExplain the effects of sub-coling and superheating of refrig erant vapor on COP of the cycle
- bDiscuss in detail water-amm onia absorption system. 10 3
- aExplain magnetic and steam jet refrigeration system. 10 3
- bDiscuss in detail the appli cation of refrigeration in food storage and cold storage. 10 3
- aExplain evaporative cooling and adiabatic mixing of airstrea ms with the help of schematic psychrometric chart
- bDrive the expression for COP o f simple air evaporative cooling system with the help schematic and T-s diagram
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 — KME601
Questions that appeared in more than one session, found by comparing 3 years of Refrigeration And Air Conditioning papers (2021-22, 2022-23, 2023-24)
2x
A machine working on reversed C arnot Cycle operates between 30 0K and 200 K. Determine the COP when it is operated as 1. A refrigerating machine 2. A heat pump
Appeared in: 2021-22 · 2023-24
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