B.TechSemester 62023-24Refrigeration And Air ConditioningKME601
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Refrigeration And Air Conditioning (KME601) - AKTU Question Paper 2023-24

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 2023-24. 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:2023-24
University:AKTU / UPTU

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Questions Asked in 2023-24

Refrigeration And Air Conditioning (KME601) — complete question paper · 100 marks · 3 Hours

Section AAttempt all q u e s t i o n s i n b r i e f .
  • a
    Define the terms refrigerating effect and COP. 02
  • b
    Compute the COP range for the re frigerator and heat pump durin g a thermodynamiccycle
  • c
    COP of vapour compres sion cycle is higher than COP of air-refrigeration cycle. Summarize your answer
  • d
    What is sub-cooling and superheating in VCRS? 02
  • e
    Name the components of VAR syste m that performs the same funct ion as that of compressor in VCR system
  • f
    What type of compressor is pref erred with refrigerant R-113 ? 02
  • g
    What do you understand by apparatus dew point (ADP)? 02
  • h
    Define sensible heat factor (SHF) and bypass factor (BPF). 02 i. What is a hermeticall y sealed compressor? 02 j. What do you understand by cooling tower 02
Section B
  • a
    A machine working on a Camot cycle operates between 305 K an d 260 K Determine the C.O.P. when it is operand as: 1. a refrigerating machine; 2. a heat pump; and 3. a heat engine
  • b
    How does the actual VCR cycle differ from the ideal VCR? Plo t the actual VCR on p-h and T-s diagram andexplain the associated losses
  • c
    In an absorption type refrige rator, the heat is supplied to NH3 generator bycondensing steam at 2 bar and 90 % dry. The temperature in the refrigerator is to be maintained at- 5° C. Find the maximum C.O.P. possible, If the refrigeration load is 20 tonnes and actual C.O.P. is 70% of the maximum C.O.P.,findthe mass of steam required per hour. Take the temper ature of the atmosphere as 30° C
  • d
    Air at l0°C DBT and 90% RH is to be brought to 35°C DBT and 22.5°C WBT with the help of winter air conditioner. If the humidified air comes out of the humidifier at 90% RH, draw the various processes involved on a skeleton psychrometric chart and find : 1. the temperature to which the air should be preheated, and 2. the efficiency of the air-washer
  • e
    Explain the applications of refrigeration for food preservat ion. Explain how refrigeration controls the spoilage of food
Section CAttempt any one p a r t o f t h e f o l l o w i n g :
  • a
    Enumerate the classifica tion of refrigeration systems and differentiate between a simple aircraft refrigeration system and
  • a
    bootstrap refrigerationsystem. Comparethe variousair-cooling systems used for aircraft on the basis of DART
  • b
    Derive an expression for COP of an air refrigerator working on Bell-Coleman 10 cycle, if the compression and expansion processes take place ac cording to the law pvn = constant. 4.Attempt any one p a r t o f t h e f o l l o w i n g
  • a
    In an ammonia vapour compression system, the pressure in the evaporator is 2 bar. Ammonia at exit is 0. 85 dry and at entry its dryness frac tion is 0.19. During compression., the work done per kg of ammonia is 150 kJ. Calculate the C.O.P. and the volume of va pourentering the compressor per minute, if the rate of ammonia circulation is 4.5 kg/min. The latent heat and specific volume at 2 bar are 1325 kJ/kg and 0.58 m3/kg respectively
  • b
    Derive the expression for C.O .P. of a refrigerating system c onsisting of three evaporators at the sam e t e m p e r a t u r e w i t h a single compressorande xpansion valve. 5.Attempt any one p a r t o f t h e f o l l o w i n g
  • a
    What is the basic function of a compressor in vapour compres sion refrigeration system? How this function is ach ieved in vapour absorption refr igeration system?
  • b
    Differentiate between physica l and thermodynamic properties of a refrigerant. Explain which are more important giving specific examples. 6.Attempt any one p a r t o f t h e f o l l o w i n g
  • a
    An air conditioning plant is required to supply 60 mm 3 of air per minute at a DBT of 21 oC and 55% RH. The outside air is at DBTof 28°C and 60% RH. Determine the mass of water drained and capacity of the cooling coil. Assume the air conditioning plant first to dehumidify and then to cool the air
  • b
    The amount of air supplied to an air conditioned hall is 300 m 3 /min. Theatmospheric conditions are 35°C DBT and 55% RH. The required conditions are 20°C DBT and 60% RH. Find out the sensible heat and latent heat removed from the air per mi nute. Also find a sensible heat factor for the system. 7.Attempt any one p a r t o f t h e f o l l o w i n g
  • a
    Write short notes on fricti onal losses and dynamic losses in flow through a duct. Write the expression for fr ictional pressure drop in duct s with proper nomenclature
  • b
    Explain in Brief about
  • a
    Steam jet refrigeration system, b.Magnetic refrigeration system

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

What do you understand by apparatus dew point (ADP)? 02

Appeared in: 2022-23 · 2023-24

2x

A machine working on a Camot cycle operates between 305 K an d 260 K Determine the C.O.P. when it is operand as: 1. a refrigerating machine; 2. a heat pump; and 3. a heat engine

Appeared in: 2021-22 · 2023-24

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