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efficiency of a reciprocating compressor taking clearance volume into
consideration. [8] (Unit-III, Topic No. 3.1)
(b) With a neat sketch explain the working of thermostatic expansion valve. [7] (Unit-III, Topic No. 3.4)
4. (a) Describe the properties of ideal refrigerant – absorbent combination. [6] (Unit-III, Topic No. 3.5)
(b) Derive an expression to find out the coefficient of performance of the absorption refrigeration system.
[9] (Unit-IV, Topic No. 4.1)
5. (a) What are the advantages and disadvantages of steam jet refrigeration system over other types of refrigeration
system. [7] (Unit-V, Topic No. 5.1)
(b) Derive the expression for finding out the quantity of steam required per ton of refrigeration in steam jet
refrigeration. [8] (Unit-V, Topic No. 5.1)
6. (a) Why ventilation is required? Explain why different ventilation standards for different purposes are
recommended? [8] (Unit-VI, Topic No. 6.3)
(b) An air-water vapour mixture enters a heater-humidifier unit at 8° C, 110 kPa, 45% RH. Find,
(i) The relative humidity at the outlet, and
(ii) The rate of heat transfer to the unit. [7] (Unit-VI, Topic No. 6.1)
7. Write the term “Effective temperature” and explain its importance in air conditioning system. Describe the factors
which affect effective temperature m3/min of moist air at 15° C DBT and 13° C WBT are mixed with 12 m3/min. An moist
air at 25° C DBT and 18° C WBT. Determine DBT and WBT of the mixture assuming the barometric pressure is one
atmospheric. Use pychrometric chart. [15] (Unit-VII, Topic No. 7.1)