B.TechSemester 62024-25Refrigeration And Air ConditioningBME601
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Refrigeration And Air Conditioning (BME601) - AKTU Question Paper 2024-25

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 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 6
Session:2024-25
University:AKTU / UPTU

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Questions Asked in 2024-25

Refrigeration And Air Conditioning (BME601) — complete question paper · 70 marks · 3 Hours

Section AAttempt all questions in brief. 02 x 7 = 14
  • a
    Define Refrigeration Effect and Ton of Refrigeration (TR). 1 K 1
  • b
    Differentiate between Re frigerator and Heat Pump. 1 K 2
  • c
    Why is subcooling done in a vapour compression cycle?
  • d
    What is the significance of DART (Dry Air Rated Temperature ) in aircraft refrigeration?
  • e
    Define term Refrigerant and Absorbent in case of vapour absorp tion refrigeration system
  • f
    What are Ozone Depletion Potential (ODP) and Global Warming Potential (GWP)?
  • g
    Define Sensible Heat Factor (SHF) and Apparatus Dew Point (ADP). 5 K 2
Section BAttempt any three of the following: 07 x 3 = 21
  • a
    Explain the Reversed Carnot Refrigeration Cycle with a T-S diag ram. Why is it not practical for real applications?
  • b
    Compare Boot-Strap and Reduced Ambient aircraft refrigeratio n systems with neat sketches
  • c
    Discuss the effect of superheating and subcooling on the perfor mance of a Vapour Compression Refrigeration System (VCRS)
  • d
    Explain the working principle of a vapour absorption refrigerat ion system with neat sketch. Consider the case of Ammonia -water
  • e
    What are secondary refrigerant s? Compare them with primary refrigerants
Section CAttempt any one part of the following: 07 x 1 = 07
  • a
    In a 5-kW refrigeration system worki ng on a simple VCRS cycle, the refrigerant enters the evaporator with an enthalpy of 75 kJ/kg and leaves at 183 kJ/kg. The enthalpy at the compressor discharge is 210 k J/kg. Calculate:(i) COP (ii) Power consumption (kW) (iii) Rate of heat transfer in the condenser (kW) (iv) Mass flow rate of Refrigerant
  • b
    A VCRS system using R-12 produces 8640 kg of ice/day. The condenser and evaporator temperatures are 48°C and -20°C, respectively. Saturated liquid leaves the condenser, and saturated vapour leaves the ev aporator. The compression is isentropic. Water at 35°C is used to form ic e at -8°C. Heat leakage into the brine tank is 10% of the total heat remov ed. Determine the total power required (kW). (Given: Specific heat of ice = 2.26 kJ/kgK, Latent heat of ice = 334.72 kJ/kg, Specific heat of vapour refrigerant = 0.82 kJ/kgK.)
  • a
    A Bell-Coleman cycle refrigerator operates with air entering th e compressor at 1 bar, -3°C, compressed to 5 bar, cooled to 17°C, and expanded polytropically (PV1.25 = C) to 1 bar. Determine: (i) Refrigeration effect (kJ/kg) (ii) Work input (kJ/kg)(iii) COP
  • b
    A Joule cycle refrigeration syst em has an outlet temperature fr om the cold space at 270 K and turbine inlet at 318 K with a pressure ratio of 4. For 1 TR cooling capacity, determine:(i) Mass flow rate (kg/s) (ii)He at rejection (kW) (iii) Compressor & Turbine work (kW) (iv) COP (v) Volume f low rates at compressor inlet & turbine outlet. Take Cpair = 1.005 KJ/KgK
  • a
    The DBT and WBT of atmospheric a ir are 30°C and 20°C, respectiv ely, at 740 mm Hg . D e t e r m i n e : (i) Partial pressure of water vapour & dew point temperature (ii) Specific humidity (iii) Relative humidity (iv) Vapour density (Given: Saturated pressur e at 30°C is 0.04242 bar and a t 20°C = 0.02337 bar.)
  • b
    A geothermal well (130°C) supplies 100,500 kJ/hr to an absorpti on refrigeration system. The environment is at 30°C, and the refri gerated space is at -22°C. Determine the maximum possible heat removal rate from the refrigerated space
  • a
    Break down the Cooling Load Calculation process by comparing th e relative contributions of wall heat gain, infiltration, and int ernal heat sources. How would you diagnose the dominant factor in a given scenario?
  • b
    Using a psychrometric chart, dem onstrate the adiabatic mixing o f two air streams with given temperature a nd humidity conditions. Calcula te the resulting DBT, WBT, and Specific Humidity, and justify your findings
  • a
    Explain the working of a Steam J et Refrigeration System using a n e a t diagram and classify the key components based on their functions
  • b
    Analyze the key distinctions bet ween vapour compression and vap our absorption refrigeration systems by: (i) Evaluating their energy sour ces in terms of efficiency and practicality (ii) Comparing their theoretica l and practical COP under varyin g conditions (iii) Diagnosing their suitabil ity for specific industrial/comm ercial applications (iv) Assessing their environmenta l impact in terms of refrigera nt emissions and energy sustainability

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.

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