(c) saturated liquid (e) unperdictable. (e) before entering the compressor. (b) work done by compressor (a) noisy operation One ton of the refrigeration is (b) evaporator tubes (d) Air (e) such a cycle does not exist. (b) delivery of compressor In a refrigeration cycle, the flow of refrigerant is controlled by Ans: b, 51. Ans: a, 81. (b) Stirling C high latent heat. Critical temperature is’ the temperature above which Ans: a, 18. An important characteristic of absorption system of refrigeration is C) on a low temperature installation, or 90 deg. A household refrigerator is a combination of refrigerator-freezer. (c) dehumidifier (c) high pressure side close to receiver • Describe a parallel-flow, plate-and-fin evaporator. (e) breakdown of refrigerant. Ans: b, 63. (a) reduce compressor overheating (c) less Critical pressure of a liquid is the pressure (c) C02 In a typical refrigeration system, where is the temperature of the refrigerant gas at the highest? Pick up the wrong statement. The vapour pressure of refrigerant should be, 36. condenser and evaporator. It should be observed that the system operates on a closed cycle. D. All of these. (a) condenser Ans: e, 42. (b) before passing through the condensei If the- cycle direction be reversed, what will be the value of COP of reversed Carnot cycle (e) mixture of ice and water Under equilibrium conditions. (c) Freon (e) non-toxic and non-inflammable. (e) in 10 hours. There is no "normal" refrigerator cycle. (e) all of the above. Ans: c, 26. The refrigerant for a refrigerator should have (c) increase cooling effect (c) in 24 hours (b) high power consumption (e) refrigerant is circulated in a refrigeration system to transfer heat. (c) after passing through the expansion or throttle valve (c) lithium bromide mixes with ammonia (e) throttling device. Cascade cycle is used where a very wide range of temperature between TL and TH is required. (b) Freon-22 (b) 50 kcal/kr (d) smaller/bigger depending on capacity (c) less (d) expansion valve Ans: a, 37. (b) Reversed Carnot cycle (a) -100°C (e) there is no such restriction. (d) temperature, pressure, and specil volume (c) zero blockage, kink, etc. (b) decreases COP (b) safety relief valve Domestic refrigerator working on vapour compression cycle uses the following type of expansion device, 34. (b) a gas will immediately liquefy Ans: e, 72. (e) unpredictable. Choose the wrong statement For obtaining high COP, the pressure range of compressor should be C. At critical Temperature. Choose the correct statement (e) 5 to 10 h.p. (b) sub-cooled liquid Ans: a, sir, Ans: c, 16. Moisture in freon refrigeration system causes (c) 420 kJ/min (d) there is no such consideration (e) ammonia vapour to strong solution. Ans: e, 88. In S.J. (b) Carbon dioxide (a) 1 : 1 (b) before passing through the condenser 12. (c) nearly same work input as for vapour compression cycle Element of the indicating device carrying the scale is called (a)     dial   (b)     housing (c)     transducer      (d)     ind... 161. Short horizontal lines on pressure-enthalpy chart show As shown in Fig. (d) 40 tons (c) perfectly tight vapour seal should be used (e) none of the above. The Cannot coefficient of performance of cycle will be Ans: a, 47. Ans: e, 89. 39. (a) condenser A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. C. High latent heat of vaporisation. (a) condensation of the refrigerant vapour (b) sulphur sticks which on detection gives white smoke (b) before passing through the condenser (a) more Ans: c, 65. (a) 0.1 to 0.5 h.p. (a) 210 kJ/min (a) increases COP (d) 6 (d) all of the above (e) critical point. An empty or lightly-loaded freezer. (c) Freon-22 According to the above formula, the maximum achievable COP for T hot = 35 °C (308 K) and T cold = 0 °C (273 K) would be 8.8. Clapeyron equation is a relation between (c) high latent heat The COP of a vapor compression plant in comparison to vapor absorption plant is Ans: a, 24. • Identify different types of evaporators. (e) 1000 kcal/day. Cascading improves the COP of a refrigeration cycle. (a) increases COP The C.O.P. (a) ineffective refrigeration Air refrigeration cycle is used in (a) results in loss of heat due to poor heat transfer (d) piston type reciprocating Assertion A : The consumption of water increases with increase in the distribution pressure. heat transfer from low to high temperature) cannot occur by itself (Claussius Definition of Second Law). (b) commercial refrigerators (c) much above critical pressure (c) air conditioning (c) 1 to 2 h.p. (b) evaporator Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system The moisture in a refrigerant is removed by The COP of two-stage R718 refrigeration system with two-phase ejectors (Figure 6.9) for air conditioning application, with temperature conditions: Te = 10°C (cooling water 10/15°C) and Tc = 35°C (condensing water 35/30°C), according to the results of numerical experiments is estimated to … an air-conditioning system. In the gas cycle, the refrigeration effect is equal to the product of the specific heat of the gas and the rise in temperature of the gas in the low temperature side. (a) critical pressure of refrigerant (d) S02 Most of the domestic refrigerators work on the following refrigeration system (d) more/less depending on rating (a) constant pressure lines (a) after passing through the condenser (c) will remain unaffected A. a. evaporator b. compressor c. expansion valve d. condenser. (e) Refrigerant is inside the lubes in case of a direct-expansion chiller. High temperature refrigeration is that produced by. One ton refrigeratiqn corresponds to In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be Ans: e, 20. (a) in 1 hour Where does the lowest temperature occur in a vapor compression cycle, (b) evaporator 11. Ans: d, 22. (c) total heat lines Clapeyron equation is applicable for registration at (a) high Ans: d, 40. For better COP of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be (e) none of the above. All of these columns deal with refrigerant pressures, states, and conditions as applied to a refrigeration system with a refrigerant like R-134a that is not a blend. Ans: a, 25. Aqua ammonia is used as refrigerant in the following type of refrigeration system Ans: b, 36. Ans: a, 6. (b) smaller Highest temperature encountered in refrigeration cycle should be A. near critical temperature of refrigerant B. above critical temperature C. at critical temperature D. much below critical temperature E. could be anywhere ANSWER: D 12. Vertical lines on pressure-enthalpy chart show constant (e) none of the above. (e) lithium bromide is driven out of solution. (a) involves no change in volume of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will (d) more or less depending on ambient conditions Ans: c, 50. (a) same (a) Co2 Answer: Option D If this is not taken care of, then we will have excessive power consumption by the refrigeration system. The C.O.P. Highest temperature encountered in refrigeration cycle should be (d) reduces weight displaced by piston (c) 50% • Describe multiple- … (b) reduce compressor discharge temperature • Determine the boiling temperature in an evaporator. (e) none of the above. Ans: a, 11. (b) smaller cabinet should be used (a) increase Ans: e, 9. Where does the lowest temperature occur in a vapour compression cycle ? The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P. (c) carnot cycle (d) capillary tube (b) Carnot (d) smelling (b) Freon-11 (c) equal to atmospheric pressure (b) constant temperature lines (a) Carnot cycle Ans: a, 71. This low pressure and low-temperature refrigerant vapor evaporates in the evaporator taking heat from the cold region. (a) compressor (b) theoretical COP/actual COP (e) none of the above. (e) decreases compressor power. Refrigeration Cycle It is a well known fact that heat flows in the direction of decreasing temperature, i.e., from a high temperature region to a low temperature region. (b) expansion valve System prevents the condenser Questions and Answers for a refrigerator should have a high heat. 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