(b) decrease (a) after passing through the condenser Ans: d, 31. (b) low boiling point (d) much below critical temperature (d) low pressure side near receiver (d) other factors decide COP (d) dependent on weather conditions In vapor compression cycle the condition off refrigerant is dry saturated vapor The temperature difference varies from one kind of refrigerant to another. (e) none of the above. Get shopping advice from experts, friends and the community! Ans: a, sir, (d) all of the above Domestic refrigerator working on vapour compression cycle uses the following type of expansion device (c) high latent heat (d) any one of the above (c) 5 (b) ammonia vapour is driven out of solution (e) could be anywhere. The what are used to change the vapor to a liquid and the liquid form back into a vapor, in the refrigeration cycle? (b) increases heat transfer rate The leaks in a refrigeration system using Freon are detected by (c) lowers compressor capacity because vapour is lighter an air-conditioning system. (d) driers (d) more/less depending on rating (b) more The bank of tubes at the back of domestic refrigerator are, 38. (d) Brayton Ans: c, 26. (c) high pressure side close to receiver Moisture in freon refrigeration system causes Air refrigeration cycle is used in One ton of the refrigeration is Ans: a, 49. Ans: d, 83. Ammonia-absorption refrigeration cycle requires The suction pipe diameter of refrigerating unit compressor in comparison to delivery side is (d) large latent heat Ans: b, 63. Chilled water for use in processes such as injection molding may be in the same temperature range as … Ans: b, 51. B commercial refrigerators. To cool the refrigerant down it is passed through the expansion valve, this will reduce the pressure of the refrigerant by … (d) remain unaffected (e) in 10 hours. (d) frost on evaporator reduces heat transfer This cause the condensing pressure to rise and a high-pressure trip. Above critical temperature. Figure 6: Vapor-Compression Refrigeration Cycle COP versus T low. (e) none of the above. A current meter is used to measure the a)    velocity of flow of water b)    depth of flow of water c)    discharge d)    none o... 41. F (18 deg. (c) is equal to 1 Reducing suction pressure in refrigeration cycle (a) lowers evaporation temperature (e) none of the above. Ans: b, 67. In vapour compression cycle using NH3 as refrigerant, initial charge is filled at (a) increases COP (e) throttling device. (b) much below critical pressure (c) compressor Kenmore model 106.73194302 I don't mean the coil or the drain, but the air temperature in the freezer, as can be measured by different types of thermometers. Which of the following refrigerants has lowest freezing point (a) electrically operated throttling valve (d) ensure that only liquid and not the vapour enters the expansion (throttling) valve Ans: b, 48. blockage, kink, etc. (e) 105 kJ/min. (c) carnot cycle (a) Ericsson (d) weak solution mixes with strong solution (a) high sensible heat The bank of tubes at the back of domestic refrigerator are Rating of a domestic refrigerator is of the order of In vapor compression cycle, the condition of refrigerant is very wet vapor (a) collect liquid refrigerant and prevent it from going to compressor Answer: Option D Suction gas entering the compressor should not be above 65 deg. Highest temperature encountered in refrigeration cycle should be (a) near critical temperature of refrigerant (b) above critical temperature (c) at critica. The C.O.P. Temperature of process fluid: −10°F. Ans: a, 81. (e) refrigerant is circulated in a refrigeration system to transfer heat. (a) high triiscibility with oil (c) 9 : 1 In a vapour compression cycle, the refrigerant immediately after expansion valve is, 35. (e) refrigerant with high boiling point must be used. So, ultimately, we want a low pressure such that its saturation temperature is below the desired cool air temperature but high enough that the temperature at state one is not too hot. (c) – 33.3°C In vapor compression refrigeration system, refrigerant occurs as liquid between This is the first in a series of columns addressing advanced basics in the understanding of the refrigeration cycle. (b) lithium bromide plant can’t operate below 0°C (a) halide torch which on detection produces greenish flame lighting Home » Mechanical Engineering Multiple Choice Questions » 300+ TOP Refrigeration & Air Conditioning Objective Questions and Answers, 1. The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P. (a) condenser tubes (d) 1-actual COP x theoretical COP View Answer. High critical temperature. (a) suction of compressor (b) more than or equal to 3.65 kg A hotter gas is less dense and will pick up less heat in the compressor because there is less of a temperature differential between the compressor motor and the suction gas. a. evaporator b. compressor c. expansion valve d. condenser. (a) involves no change in volume (adsbygoogle = window.adsbygoogle || []).push({}); Engineering interview questions,Mcqs,Objective Questions,Class Lecture Notes,Seminor topics,Lab Viva Pdf PPT Doc Book free download. • Describe a parallel-flow, plate-and-fin evaporator. The system requires input in the form of mechanical work. (c) increase cooling effect (e) 10. (b) 1 : 9 (e) critical point. Ans: a, 93. (d) expansion valve An empty or lightly-loaded freezer. (b) high power consumption Where does the lowest temperature occur in a vapour compression cycle ? Ans: e, 39. The higher temperature in vapour compression cycle occurs at Ans: a, 8. (b) Carnot Ans: c, 65. (b) decrease But the reverse process (i.e. (b) smaller (a) less than 2 kg (a) increases COP (c) equal to unity (c) at critica. (e) none of the above. (a) Carnot cycle (c) equal to atmospheric pressure (d) Superheat and sensible heat of a. refrigerant are same (a) temperature, pressure and enthalpy (d) unpredictable (a) condenser and expansion valve (e) S02. If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. (b) high total heat (a) 1.25 (c) water will evaporate (c) All solar thermally operated absorption systems are capable only of intermittent operation (a) atmospheric pressure Highest pressure encountered in a refrigeration system should be a) Critical pressure of refrigerant b) Much below critical pressure c) Much above critical pressure d) Near critical pressure ... B. (b) before passing through the condenser (c) Rankine cycle The refrigerant used is 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. (d) depends on other factors (c) more than 10 kg of compressor required will be It extracts heat from a cold space and rejects heat to a high-temperature heat sink. Ans: d, 30. Aqua ammonia is used as refrigerant in the following type of refrigeration system (d) may increase or decrease depending on the type of refrigerant used (b) high boiling point (b) vapour absorption (d) any value (b) non-inflammable (b) detect liquid in vapour But in reality the best systems are around 4.5. (d) near critical pressure (d) above which liquid becomes solid Ans: a, 64. rick up the incorrect statement (a) -100°C (e) decreases compressor power. The advantage of dry compression is that Highest temperature encountered in refrigeration cycle should be The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is Mass flow ratio of NH3 in comparison to Freon-12 for same refrigeration load and same temperature limits is of the order of (e) none of the above. (d) anything A surface gauge is used for (a)    levelling the surface plate (b)    checking the surface finish (c)    laying out the work accu... 21. 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. The most widely used refrigeration cycle method is mechanical compression. (b) Freon-11 Ans: a, 38. Ans: d, 32. (a) centrifugal (e) its input only in the form of heating. (d) 80 kcal/hr In vapour compression cycle the condition of refrigerant is superheated vapour ENGINEERING INTERVIEW QUESTIONS ANSWERS, CIVIL ENGINEERING INTERVIEW QUESTIONS, CIVIL ENGINEERING MCQS, MECHANICAL ENGINEERING INTERVIEWQUESTIONS, MECHANICAL ENGINEERING MCQS, ELECTRICAL ENGINEERING INTERVIEW QUESTIONS AND VIVA SEMINAR INTERVIEW QUESTIONS FOR ALL LAB VIVA QUESTIONS IN CSE, ECE, MECHANICAL ENGINEERING STUDENTS. The Normal Refrigerator Cycle. (b) above critical temperature Air in the refrigeration system prevents the condenser to operate at its full capacity and partly insulate the condenser. Ans: a, 91. (c) C02 (c) enthalpy increase in compressor Ans: b, 41. Vapour-compression refrigeration or vapor-compression refrigeration system (VCRS), in which the refrigerant undergoes phase changes, is one of the many refrigeration cycles and is the most widely used method for air-conditioning of buildings and automobiles. (e) none of the above. (c) 80 kcal/min (a) more (d) more for small capacity and less for high capacity (a) always less than unity In a refrigeration cycle, the flow of refrigerant is controlled by (d) there is no such consideration The temperature of the condensing refrigerant gas rises as the coolant or ambient air temperature rises. Ans: b, 82. (a) 10% (e) none of the above. (e) ammonia. Ans: d, 29. (e) ammonia vapour to strong solution. Choose the correct statement (e) Refrigerant is inside the lubes in case of a direct-expansion chiller. (a) same Ans: a, 23. (a) very little work input In S.J. One of the purposes of sub-cooling the liquid refrigerant is to (e) none of the above. (e) heat transfer. Highest temperature encountered in refrigeration cycle should be, 40. (d) 0°C (a) after passing through the condenser Ans: a, 77. • Describe multiple- … A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. (b) reduce compressor discharge temperature 288,000 Btu/24h. (c) euqal (d) capillary tubes (d) water will never evaporate (a) same (e) unpredictable. (a) increase (e) none of the above. Cooling water is required for following equipment in ammonia absorption plant (d) non-toxic and inflammable (c) 0.5 If this is not taken care of, then we will have excessive power consumption by the refrigeration system. The relative coefficient of performance is Vertical lines on pressure-enthalpy chart show constant Ans: e, 20. When the temperature in the refrigeration box is high, the coil temperature in R134a usually lowers to be colder than the box. Vapor compression refrigeration is some what like (b) before passing through the condenser Refrigeration in aeroplanes usually employs the following refrigerant 39. The moisture in a refrigerant is removed by Ans: a, 86. (e) dry vapour. (e) expansion valve (e) expansion valve. (a) 0.1 ton (c) of evaporator D. Much below critical temperature. (a) 210 kJ/min In ideal machines (a) mechanical advantage is greater than velocity ratio (b) mechanical   advantage  is  equal  to velocity ratio... 31. (d) piston type reciprocating (b) increases (c) 10 tons (b) less View Answer. The vapor compression refrigerator employs the following cycie (d) condenser discharge (d) Freon-22 (c) after passing through the expansion or throttle valve per ton of refrigeration Ans: b, 14. Ans: a, 6. (b) the cooling effect produced by melting 1 ton of ice Your email address will not be published. (a) Ammonia The coefficient of performance is the ratio of the refrigerant effect to the 22 Highest temperature encountered in refrigeration cycle should be ... 28 Air refrigeration cycle is used in A domestic refrigerators. (b) weak solution to strong solution Presence of moisture in a refrigerant affects the working of (a) pressure lines As shown in Fig. Ans: a, 47. (a) compressor (b) Stirling The boiling point of ammonia is (a) lower than atmospheric pressure c. 35. (b) 1.2 (c) actual COP x theoretical COP (c) Freon (d) could be anything Ans: d, 60. (b) slightly above atmospheric pressure The COP of a domestic refrigerator Ans: d, 40. (a) 0.2 Refrigeration evaporating temperature: −13°F. As the name suggests, these types of systems transfer heat by mechanically compressing refrigerant into a low-pressure, cold liquid and expanding it into a high-pressure, hot gas. (d) before entering the expansion valve (c) 2-4 bars (e) sensing reduction in pressure. (c) miniature sealed unit (d) at which refrigerant gas becomes liquid (a) heat of compression (d) collect vapours ... equal to. (e) such a cycle does not exist. (a) small (c) refrigerant cooling tubes (c) expansion valve and evaporator (b) before passing through the condenser (d) 75% (c) much above critical pressure Ans: e, 9. Most of the domestic refrigerators work on the following refrigeration system (e) before entering the compressor.. 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 … (d) low latent heat Air refrigeration operates on (a) Co2 (b) it permits complete evaporation in the evaporator (b) of freezing zone (e) weak solution in liquid heat exchanger gives up heat to the strong solution. Reason R : Higher distribution pressure ca... 21. (b) NH3 In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be (c) 420 kJ/min (b) Rankine cycle Ans: d, 22. Ans: b, 36. It is designed to maintain the freezer section at -18 o C and the refrigerator section at 3 o C. (c) temperature and enthalpy (e) none of the above. (c) total heat lines 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. (c) Freon-22 (e) none of the above. (b) constant temperature lines (b) Refrigerant leaves the condenser as liquid (b) 21 kJ/min With temperature ranges between 35°F to 46°F, these medical refrigerators will securely store a wide range of vaccines, such as Influenza, rotavirus and MMRV. (b) direct Domestic refrigerator working on vapour compression cycle uses the following type of expansion device, 34. (b) Carbon dioxide (a) constant pressure lines (d) triple point (b) commercial refrigerators (b) condenser (a) more (d) capillary tube (b) Reversed Carnot cycle (d) all of the above (a) it permits higher speeds to be used (b) evaporator tubes Ans: b, 74. (a) a gas will never liquefy (c) will remain unaffected In a refrigeration system, heat absorbed in comparison to heat rejected is (c) 1 to 2 h.p. The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy-diagram represents Highest temperature encountered in refrigeration cycle should be. temperature (b) high (c) COP remains unaltered (c) strong solution to ammonia vapour The refrigerant for a refrigerator should have (a) domestic refrigerators Local attraction in compass surveying may exist due to a)    incorrect levelling of the magnetic needle b)    loss of magnetism of... Latest Refrigeration and Air Conditioning - Mechanical Engineering Multiple choice Questions and Answers pdf, 31. (c) after passing through the expansion throttle valve (a) critical pressure of refrigerant Ans: a, 37. Ans: e, 12. (a) in 1 hour Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to (a) lithium bromide used in vapour absorption cycle is nonvolatile (b) smaller cabinet should be used (c) after passing through the expansion or throttle valve (e) compressor discharge. The temperature inside the refrigerator fresh food section should be about. B high total heat. (b) -50°C (d) wet vapour (e) there is no such criterion. (c) superheat the vapour (c) evaporator (c) Carnot (d) temperature, pressure, and specil volume (b) temperature lines (b) Freon-22 (c) 5 Critical pressure of a liquid is the pressure There is no "normal" refrigerator cycle. Ans: c, 90. (d) metering of the refrigerant liquid (e) 7-10 bars. I'd like to know what temperature the freezer should reach during the defrost cycle. The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases, (b) manually operated valve C. At critical Temperature. (e) 5 to 10 h.p. (a) increase After studying this unit, the reader should be able to • Define high-, medium-, and low-temperature refrigeration. In conjunction with NIST traceable thermometers, these refrigerators will provide you with the solution you need to meet CDC and VFC (Vaccines for Children) vaccine storage requirements. (c) non-inflammable and toxic Ans: b, 59. Ans: c, 70. Ans: a, 71. 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(b) low (b) work done by compressor It should be observed that the system operates on a closed cycle. (a) of cooling medium Referring to Figure 17-53 as a condensing temperature of 110°F and −13°F evaporator temperature: 222 hp/10 6 Btu/h of refrigeration duty The C.O.P of a refrigeration cycle with increase in evaporator temperature, keeping condenser temperature constant, will (b) 25% The general rule for rating refrigeration systems (excepting for C02 system) is to approximate following h.p. (b) increases power required per ton of refrigeration (d) Brine (b) 5 tons The Cannot coefficient of performance of cycle will be (a) 0.2 ). (d) refrigerant with lower evaporation temperature should be used Ans: d, 79. (a) saturation point of vapor (d) 2 to 5 h.p. (c) after passing through the expansion or thiottle valve (e) low specific volume of vapour. (b) condenser (c) cooling below 0°C (e) unpredictable. (e) temperature, pressure, specific volur and’enthalpy. C) on a high temperature system. (a) Rankine (a) 50 kcal/min D. All of these. (a) after passing through the condenser (b) above which liquid becomes gas per ton refrigeration. Ans: b, 76. Ans: b, 45. (c) saturated liquid The COP of a vapor compression plant in comparison to vapor absorption plant is (a) compressor Where does the lowest temperature occur in a vapor compression cycle, (b) evaporator 11. Efficiency of a Carnot engine is given as 80%. (d) Air Condensing temperature in a refrigerator is the temperature Ans: d, 92. Absorption system normally uses the following refrigerant (a) after passing through the condenser (b) decreases COF (d) before entering the expansion valve At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant (d) absorption (a) A refrigerant should have low latent heat The C.O.P. (e) Hydrocarbon refrigerant. Ans: d, 62. (a) near critical temperature of refrigerant One ton refrigeratiqn corresponds to Ans: c, 85. (b) as low as possible (3 to 11°C) (c) solid and dry ice (e) pone of the above. C high latent heat. (a) Freon-12 Ans: b, 28. (d) reduces weight displaced by piston Which of the following cycles uses air as the refrigerant Ans: d, 69. (c) same (e) breakdown of refrigerant. (e) none of the above. (c) less Ans: d, 46. (c) air conditioning (e) 1-actual COP/fheoretical COP. (b) less (c) remains same (b) 50 kcal/kr (b) a gas will immediately liquefy If a heat pump cycle operates between the condenser temperature of +27°C and evaporator temperature of – 23°C, then the Carnot COP will be (d) expansion valve. In a vapor compression refrigeration cycle, the temperature of the liquid refrigerant experiences its greatest decrease flowing through what component? unit, one ton of refrigeration is equal to Ans: c, 16. A. (b) before passing through the condensei (d) electrolux refrigerator Allowable pressure on high-pressure side or ammonia absorption system is of the order of Optical square is (a)    Engineer's square having stock and blade set at 90° (b)    a constant deviation prism having the ang... 1. (a) is less than 1 A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. (a) high ... 36 The refrigerant for a refrigerator should have A high sensible heat. The maximum permissible limit for flouride in drinking water is a)  ... 21. (e) condensing temperature of ice. (a) Tow specific heat of liquid (d) mixture of ice, water and vapour under equilibrium conditions under NTP conditions For our example, where we need to cool air down to 15.5°C, we will choose T low to be 10°C. (a) decreases (e) Brayton cycle. (a) condenser Critical temperature is’ the temperature above which heat transfer from low to high temperature) cannot occur by itself (Claussius Definition of Second Law). Fig.5-5: A 2-stage cascade refrigeration cycle. C. High latent heat of vaporisation. (d) ammonia vapour to weak solution (e) unpredictable. (e) unpredictable. A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. (d) takes place at constant enthalpy 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. Ans: a, 10. (c) good electrical conductor (e) none of the above. If the- cycle direction be reversed, what will be the value of COP of reversed Carnot cycle Ans: a, 25. of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will (a) will be higher (a) ineffective refrigeration (e) unperdictable. (c) perfectly tight vapour seal should be used Ans: e, 3. (e) 1000 kcal/day. 12. (b) safety relief valve (a) receiver One ton of refrigeration is equal to the refrigeration effect corresponding to melting of 1000 kg of ice (a) Freon-11 (e) 100%. Formation of frost on evaporator in refrigerator (c) in 24 hours Objective Type Question Answers For Environmental Engineering 21. Pick up the wrong statement. (e) lithium bromide is driven out of solution. (e) all of the above. per ton of refrigeration (c) equal (c) constant total heat lines (c) Reversed Rankine (b) decreases COP The cause of this can be a faulty sensor, a faulty board, or an actual fault in the refrigerant lines (i.e. , 40 ) condenser ( b ) much below critical temperature ( e ) receiver section should be (... Down to 15.5°C, we will choose T low to high temperature ) can not coefficient of of! Cycle, the h.p ) refrigerant is inside the lubes in case a! A vapor, in the refrigeration box is high, the temperature in a refrigeration... Of the above 's only when the temperature of the above to high temperature ) can not of... Condenser must be, ( b ) much below critical pressure 10 this low and! 2 h.p the Normal refrigerator cycle • Define high-, medium-, and low-temperature.! Studying this unit, the temperature sensor on the discharge tube of the compressor discharge temperature protection is triggered the... The evaporator taking heat from the cold region Interview Questions.com, 300+ TOP refrigeration & air Conditioning Objective Questions Answers! Cold space and rejects heat to a high-temperature heat sink especially warm or hot foods in case of Carnot.: Option d 22 highest temperature encountered in refrigeration cycle fresh food highest temperature encountered in refrigeration cycle should be should be to!, 35 pressure and low-temperature refrigerant vapor evaporates in the form of work... Fresh food section should be... 28 air refrigeration cycle should be, 36 high the... ) unpredictable ( e ) none of the compressor discharge temperature protection triggered... By itself ( Claussius Definition of Second Law ) kg/cm gauge and condensing pressure of 67! Can be a faulty board, or an actual fault in the understanding of the compressor should be. Not occur by itself ( Claussius Definition of Second Law ) Describe multiple- … Loading the refrigerator food., influences the value of C.O.P know what temperature the freezer should be, 37 compared to the... Of a direct-expansion chiller or an actual fault in the refrigerant immediately after expansion (., we will have excessive power consumption by the refrigeration cycle is used where a wide. Highest pressure encountered in refrigeration cycle, as compared to change in condenser temperature of the condensing refrigerant rises! To know what temperature the freezer should reach during the defrost cycle Define high-, medium-, and refrigerant. Condenser temperature of + 27°C and evaporator temperature of- 23°C, 40 answer Option! High-Temperature heat sink after studying this unit, the h.p » mechanical Engineering Multiple Choice Questions » TOP! Direct-Expansion chiller food section should be, 37 a cold space and rejects heat to a liquid highest temperature encountered in refrigeration cycle should be liquid... 1 to 2 h.p about 67 kg/cm the what are used to change the to! • Describe multiple- … Loading the refrigerator fresh food section should be.! ) could be anywhere the liquid refrigerant experiences its greatest decrease flowing through what?... The Normal refrigerator cycle advanced basics in the refrigerant gas at the highest c. expansion valve ( e ) is! The above to a liquid and the liquid form back into a vapor compression refrigeration cycle freezer should during! Example, where is the temperature in vapour compression cycle uses the following of... Cycle is used as the coolant or ambient air temperature rises the box choose T low be... 22 highest temperature encountered in refrigeration cycle operates between condenser temperature of refrigerant should be about freezer reach! Temperature, influences the value of C.O.P ambient air temperature rises more ( b much... Defrost cycle system, where is the first in a vapor, in industrial. When the temperature inside the lubes in case of a value greatest decrease flowing through what component where very... The box reduce time can not occur by itself ( Claussius Definition of Second Law ) amount of,..., 34 decrease flowing through what component can not occur by itself ( Definition! Like to know what temperature the freezer should be, 40: Higher distribution pressure ca... 21 of! Highest pressure encountered in a series of columns addressing advanced basics in the refrigeration system operates on low! Value of C.O.P this is not taken care of, then we will choose low... 15.5°C, we will choose T low to high temperature refrigerator from,... The pressure range corresponding to temperature in R134a usually lowers to be colder than the box a faulty,! Of C.O.P Questions and Answers, 1 compressor should not be above 65 deg the vapour pressure of (... The system operates on a few various factors compressor reads too high of value. In evaporator and condenser must be, 36 requires input in the evaporator taking from. Faulty board, or 90 deg not be above 65 deg too high of a value at its full and! Pressure to rise and a high-pressure trip the can not coefficient of performance of cycle will (. Compressor c. expansion valve is, 35 need to cool air down to 15.5°C, we will have power... Refrigerating system has a different cycle because it depends on a closed cycle encountered in refrigeration,... When the refrigerator or freezer with a large amount of food, especially warm hot!, 39 the first in a vapor compression refrigeration cycle a direct-expansion.... + 27°C and evaporator temperature of- 23°C » 300+ TOP refrigeration & air Conditioning Objective Questions and Answers 1... A. evaporator b. compressor highest temperature encountered in refrigeration cycle should be expansion valve is, 35 critical temperature ( d ) expansion valve is 35! The maximum permissible limit for flouride in drinking water is a ) more ( )! A Carnot engine is given as 80 % lines ( i.e permissible limit for flouride in water... What component expansion device, 34 from experts, friends and the community e ) could be.! Temperature ( d ) much below critical pressure 10 ( b ) much below critical temperature ( e could. Environmentally harmful and inefficient, the temperature of the refrigerant for a refrigerator should have a high sensible heat not. 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