(e) sensing reduction in pressure. (e) S02. Objective Type Question Answers For Environmental Engineering 21. Home » Mechanical Engineering Multiple Choice Questions » 300+ TOP Refrigeration & Air Conditioning Objective Questions and Answers, 1. (b) evaporation of the refrigerant liquid Vertical lines on pressure-enthalpy chart show constant (a) 50 kcal/min Mechanical Engineering Multiple Choice Questions. (e) unpredictable. Superheating in a refrigeration cycle This is the first in a series of columns addressing advanced basics in the understanding of the refrigeration cycle. (c) 5 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. 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) constant pressure lines (e) none of the above. (a) condensation of the refrigerant vapour Rating of a domestic refrigerator is of the order of (d) remain unaffected (e) at which all the three phases exist together. (d) 6 This low pressure and low-temperature refrigerant vapor evaporates in the evaporator taking heat from the cold region. (e) 100%. Ans: a, 47. (a) more (c) good electrical conductor Choose the correct statement (e) Refrigerant is inside the lubes in case of a direct-expansion chiller. (b) manually operated valve (e) ammonia vapour to strong solution. (a) compressor The Cannot coefficient of performance of cycle will be (a) high triiscibility with oil A standard ice point temperature corresponds to the temperature of (e) unpredictable. (e) expansion valve Ans: d, 43. 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. In a vapour compression cycle, the refrigerant immediately after expansion valve is, 35. (b) decrease The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy-diagram represents (b) condenser (c) 0.5 Ans: c, 52. The vapour pressure of refrigerant should be, 36. 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. (b) quiet operation The evolution of heat of solution takes place in ammonia absorption plant when Ans: a, 10. (a) electrically operated throttling valve (a) the standard unit used in refrigeration problems The temperature of the condensing refrigerant gas rises as the coolant or ambient air temperature rises. Optical square is (a)    Engineer's square having stock and blade set at 90° (b)    a constant deviation prism having the ang... 1. (b) less Ans: c, 54. For better COP of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be (a) condenser (e) 7-10 bars. The condensing pressure due to the presence of non-condensable gases, as compared to that actually required for condensing temperatures without non-condensable gases, Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system Ans: a, 95. Ans: a, 18. One ton of the refrigeration is C) on a high temperature system. The refrigerant used is (e) lithium bromide is driven out of solution. Which of the following cycles uses air as the refrigerant (d) expansion valve (a) near critical temperature of refrigerant (c) temperature and enthalpy (d) frost on evaporator reduces heat transfer (e) 3 : 1 (a) Co2 (a) 0.2 (c) will remain unaffected (d) piston type reciprocating per ton of refrigeration Domestic refrigerator working on vapour compression cycle uses the following type of expansion device, 34. Pick up the wrong statement. (c) less (e) Hydrocarbon refrigerant. (e) heat transfer. (d) toxic Ans: d, 60. (e) unpredictable. (d) electrolux refrigerator ). (e) before entering the compressor. (c) – 33.3°C (a) increase (b) lithium bromide plant can’t operate below 0°C Ans: d, 35. (c) high pressure side close to receiver The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P. If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. 12. (b) If operating temperature of system is low, then refrigerant with low boiling point should be used (d) reversed Rankine cycle Ans: d, 5. The coefficient of performance is the ratio of the refrigerant effect to the (b) reduce compressor discharge temperature Ans: b, 44. To cool the refrigerant down it is passed through the expansion valve, this will reduce the pressure of the refrigerant by … (a) 10% (b) 1.2 The temperature inside the refrigerator fresh food section should be about. (e) unpredictable. (c) lowers compressor capacity because vapour is lighter (e) Brayton cycle. plz send me pdf of this question and answer, sir thanking you for this question answer, Your email address will not be published. Ans: e, 89. (e) 100 tons. Domestic refrigerator working on vapour compression cycle uses the following type of expansion device In S.J. There is no "normal" refrigerator cycle. (a) same (c) after passing through the expansion throttle valve (e) compressor discharge. (c) lithium bromide mixes with ammonia (d) before entering the expansion valve (b) increases High critical temperature and pressure: The critical temperature of the refrigerant should be as high as possible above the condensing temperature in order to have a greater heat transfer at a constant temperature. Refrigeration is the process of lowering the temperature of a substance below that of its surroundings and includes production of chilled water for air conditioning or process applications. In vapour compression cycle using NH3 as refrigerant, initial charge is filled at (e) 105 kJ/min. • Describe a parallel-flow, plate-and-fin evaporator. Which of the following is not a desirable property of a refrigerant Ans: e, 12. an air-conditioning system. The freezer should be at least 3/4 full to maintain proper temperatures and reduce time. (a) receiver (b) high (d) Brine (e) none of the above. (b) decrease (d) more/less depending on size of plant (b) axial After studying this unit, the reader should be able to • Define high-, medium-, and low-temperature refrigeration. Ans: a, 19. Suction gas entering the compressor should not be above 65 deg. Ans: d, 21. Ans: b, 74. The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is (a) 1 : 1 (d) the refrigeration effect to produce 1 ton of ice at NTP conditions (e) none of the above. (d) all of the above In column analogy method, the area of an analogous column for a fixed beam of span L and flexural rigidity El is taken as a)    L/E... 31. (d) capillary tube Ans: d 40. Highest temperature encountered in refrigeration cycle should be. (d) gas liquefaction Ans: c, 73. 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. (d) more/less depending on rating heat transfer from low to high temperature) cannot occur by itself (Claussius Definition of Second Law). Vapor compression refrigeration is some what like (d) very little power consumption (a) Ammonia (d) collect vapours (d) any value Ans: d, 56. (b) NH3 Ans: a, 49. (a) involves no change in volume (d) there is no such consideration (d) much below critical temperature Figure 6: Vapor-Compression Refrigeration Cycle COP versus T low. (c) perfectly tight vapour seal should be used F (32 deg. Highest temperature encountered in refrigeration cycle should be temperature (c) enthalpy increase in compressor (a) Rankine (c) superheat the vapour (b) more than or equal to 3.65 kg unit, one ton of refrigeration is equal to (d) zero work input (b) in 1 minute (a) Carnot cycle (e) all of the above. (a) always less than unity (c) thermostatic valve (e) constant volume lines. (d) 75% If the- cycle direction be reversed, what will be the value of COP of reversed Carnot cycle Clapeyron equation is applicable for registration at (d) at which refrigerant gas becomes liquid The temperature difference varies from one kind of refrigerant to another. (d) depends upon the make (e) there is no such restriction. (a) a gas will never liquefy (a) Tow specific heat of liquid At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant (adsbygoogle = window.adsbygoogle || []).push({}); Engineering interview questions,Mcqs,Objective Questions,Class Lecture Notes,Seminor topics,Lab Viva Pdf PPT Doc Book free download. (d) before entering the expansion valve (b) ice at – 4°C (d) entropy lines (a) Freon-12 (c) constant total heat lines In a refrigeration cycle, the flow of refrigerant is controlled by In a typical refrigeration system, where is the temperature of the refrigerant gas at the highest? Engineering 2021 , Engineering Interview Questions.com, 300+ TOP Refrigeration & Air Conditioning Objective Questions and Answers. Ans: a, 86. (e) low specific volume of vapour. Freon group of refrigerants are (b) much below critical pressure (d) driers Ans: b, 82. (c) dehumidifier (a) condenser tubes B commercial refrigerators. Moisture in freon refrigeration system causes (a) condenser (a) high, of the order of 25° (a) same 39. The higher temperature in vapour compression cycle occurs at, 39. (d) condenser discharge (d) ensure that only liquid and not the vapour enters the expansion (throttling) valve 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) slightly above atmospheric pressure Reducing suction pressure in refrigeration cycle (e) pone of the above. 22 Highest temperature encountered in refrigeration cycle should be ... 28 Air refrigeration cycle is used in A domestic refrigerators. (b) Rankine cycle (c) after passing through the expansion or thiottle valve Loading the refrigerator or freezer with a large amount of food, especially warm or hot foods. The most widely used refrigeration cycle method is mechanical compression. In a flooded evaporator refrigerator, an accumulator at suction of compressor is used to (a) water at 0°C (d) anything (c) after passing through the expansion or throttle valve Ans: d, 34. I'd like to know what temperature the freezer should reach during the defrost cycle. (c) Reversed Rankine of a domestic refrigerator in comparison to domestic air conditioner will be (c) using reagents (d) other factors decide COP It is designed to maintain the freezer section at -18 o C and the refrigerator section at 3 o C. The relative coefficient of performance is (e) volume lines. (e) none of the above. Allowable pressure on high-pressure side or ammonia absorption system is of the order of Ans: a, 6. The C.O.P. • Identify different types of evaporators. (c) 9 : 1 D. Much below critical temperature. (b) increases power required per ton of refrigeration (b) condenser High temperature refrigeration is that produced by. per ton refrigeration. (a) domestic refrigerators (a) after passing through the condenser (c) equal to unity (e) Reversed Carnot. View Answer. (b) high total heat (a) decreases Ans: b, 48. (a) evaporator (c) 2-4 bars The advantage of dry compression is that (e) 5 to 10 h.p. (c) Carnot (b) decreases COP Air in the refrigeration system prevents the condenser to operate at its full capacity and partly insulate the condenser. (c) equal If this is not taken care of, then we will have excessive power consumption by the refrigeration system. (b) before passing through the condensei (e) expansion valve. (b) 21 kJ/min An important characteristic of absorption system of refrigeration is (a) lowers evaporation temperature (d) before entering the expansion valve For obtaining high COP, the pressure range of compressor should be Ans: e, 72. The bank of tubes at the back of domestic refrigerator are, 38. (d) highly toxic and inflammable Assertion A : The consumption of water increases with increase in the distribution pressure. The system requires input in the form of mechanical work. Efficiency of a Carnot engine is given as 80%. (c) 50% Ans: c, 87. (a) bigger cabinet should be used (b) constant temperature lines (b) temperature lines (b) commercial refrigerators The average cycle is about 30 minutes, but that's only when the refrigerator stays closed. of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will (d) capillary tubes D. All of these. (b) safety relief valve (d) other factors decide COP (a) -100°C (c) zero (e) there is no such criterion. The cause of this can be a faulty sensor, a faulty board, or an actual fault in the refrigerant lines (i.e. The moisture in a refrigerant is removed by (b) 1.2 (e) decreases compressor power. (e) dual cycle. Ans: d, 40. (e) less for small capacity and more for high capacity. Most of the domestic refrigerators work on the following refrigeration system Above critical temperature. (a) saturation point of vapor (e) none of the above. Ans: d, 62. 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. (b) specific volume and enthalpy (d) Air An empty or lightly-loaded freezer. Near critical temperature of refrigerant. (b) saturation point of liquid (c) euqal (b) Stirling (a) suction of compressor (c) strong solution to ammonia vapour (d) wet vapour (d) expansion valve. It should be observed that the system operates on a closed cycle. (c) evaporator (a) noisy operation Temperature of process fluid: −10°F. (d) constant entropy lines (b) increases heat transfer rate temperature (d) much below critical temperature (e) could be anywhere. Ans: d, 31. Ans: b, 36. (b) detect liquid in vapour • Determine the boiling temperature in an evaporator. (b) 0.5 to 0.8 h.p. The boiling point of ammonia is (e) 33.3°C. Cascade cycle is used where a very wide range of temperature between TL and TH is required. View Answer. Ans: b, 59. Choose the wrong statement Note that, these equations must use an absolute temperature scale (T cold, T hot) and it is only a theoretical maximum efficiency. (a) condenser and expansion valve (d) ammonia vapour to weak solution (a) collect liquid refrigerant and prevent it from going to compressor Get shopping advice from experts, friends and the community! (d) higher critical temperature (c) Rankine cycle (b) as low as possible (3 to 11°C) Highest temperature encountered in refrigeration cycle should be (a) near critical temperature of refrigerant (b) above critical temperature (c) at critica. (d) large latent heat The vapor pressure of refrigerant should be Ans: a, 80. (a) high (c) reversed Camot cycle Under-cooling in a refrigeration cycle (a) of cooling medium (b) smaller (e) in 10 hours. (c) compression of the refrigerant vapour (d) 1 : 3 (c) C02 (d) water will never evaporate The Normal Refrigerator Cycle. (a) after passing through the condenser Toughness index is defined as the ratio of a)    plasticity index to consistency index b)    plasticity index to flow index c)   ... 91. (d) expansion valve (e) receiver. (a) Carnot cycle (e) non-inflammable. Ans: b, 41. per ton of refrigeration (b) work done by compressor (e) depends upon the weather conditions. (a) very little work input (a) more In vapor compression cycle the condition off refrigerant is dry saturated vapor Ans: c, 90. (d) 2 to 5 h.p. (e) unpredictable. (e) unpredictable. (b) low (c) remain unaffected A. Clapeyron equation is a relation between Cooling water is required for following equipment in ammonia absorption plant (a) liquid (d) compressor and condenser (a) ineffective refrigeration (e) none of the above. (b) decreases COF Ans: c, 75. (d) 5-6 bars (a) heat of compression (d) absorption (b) high boiling point (b) 25% (e) Refrigerant is inside the lubes in case of a direct-expansion chiller. (b) Carnot (b) before passing through the condenser (e) none of the above. (b) higher than atmospheric pressure (b) less (c) evaporator (e) increase refrigeration effect. Your email address will not be published. (e) temperature, pressure, specific volur and’enthalpy. (e) weak solution in liquid heat exchanger gives up heat to the strong solution. Ans: a, 23. (b) 0.8 Ans: b, 45. Ans: a, 38. (a) increases COP (a) small Refrigeration evaporating temperature: −13°F. (d) near critical pressure (d) can be avoided by proper design (c) after passing through the expansion or throttle valve (d) unpredictable Ans: c, 16. (b) non-inflammable For better COP of refrigerator, the pressure range corresponding to temperature in evaporator and condenser must be, 37. (d) may be higher or lower depending upon the nature of non-condensable gases The higher temperature in vapour compression cycle occurs at (e) 1000 kcal/day. The loss of the compressor and power in connection with increase in temperature, the condensing cycle is more serious when the suction process temperature below. (c) C02 (d) low latent heat (e) the refrigeration effect to produce 1 ton of ice in 1 hour time. Highest temperature encountered in refrigeration cycle should be, 40. Ans: b, 66. (b) the cooling effect produced by melting 1 ton of ice Element of the indicating device carrying the scale is called (a)     dial   (b)     housing (c)     transducer      (d)     ind... 161. (a) halide torch which on detection produces greenish flame lighting (d) any one of the above 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. It extracts heat from a cold space and rejects heat to a high-temperature heat sink. (b) 1 : 9 Ans: d, 92. (c) solid and dry ice (e) none of the above. (c) compressor (a) results in loss of heat due to poor heat transfer (d) refrigerant with lower evaporation temperature should be used The maximum permissible limit for flouride in drinking water is a)  ... 21. (a) it permits higher speeds to be used (c) COP remains unaltered Ans: a, 25. Ans: c, 65. Ans: b, 55. (c) carnot cycle Ans: a, 24. (b) above critical temperature Required fields are marked *. Condensing temperature in a refrigerator is the temperature (e) none of the above. (c) after passing through the expansion or throttle valve Ans: c, 70. (d) 80 kcal/hr In refrigerators, the temperature difference between the evaporating refrigerant and the medium being cooled should be Ans: a, 71. (d) more for small capacity and less for high capacity 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. The domestic refrigerator uses following type of compressor Ans: b, 63. Therefore, for the same cooling load, gas refrigeration cycle machines require a larger mass flow rate, which in turn increases their size. One ton refrigeratiqn corresponds to Ans: e, 4. Ans: b, 61. C high latent heat. (d) may increase or decrease depending on the type of refrigerant used blockage, kink, etc. One of the purposes of sub-cooling the liquid refrigerant is to (c) non-inflammable and toxic (d) weak solution mixes with strong solution (d) any value (a) same (b) above which liquid becomes gas (e) such a cycle does not exist. (e) condenser, absorber and separator (rectifier). (a) lower than atmospheric pressure (d) more or less depending on ambient conditions (b) smaller cabinet should be used (b) evaporator (b) sub-cooled liquid (e) dry vapour. (e) unpredictable. Ans: b, 2. (a) will be higher (e) before entering the compressor. Ans: d, 58. (b) sulphur sticks which on detection gives white smoke (e) none of the above. (e) critical point. (b) before passing through the condenser per ton of refrigeration (a) 0.1 to 0.5 h.p. Condensing temperature of refrigerant (propane): 110°F. (e) before entering the compressor. 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. (e) condensing temperature of ice. (c) may increase or decrease depending on the type of refrigerant used Ans: c, 26. (b) more In ideal machines (a) mechanical advantage is greater than velocity ratio (b) mechanical   advantage  is  equal  to velocity ratio... 31. (a) vapour compression Ans: a, sir, (b) Reversed Carnot cycle The Vapor Compression Refrigeration Cycle is nearly 200 years old, but it does not seem ready to leave the scene any time soon. (a) Freon-11 (c) increase cooling effect This cause the condensing pressure to rise and a high-pressure trip. (c) less (c) nearly same work input as for vapour compression cycle c. 35. (c) optimum 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. (e) refrigerant with high boiling point must be used. (a) after passing through the condenser Ans: d, 46. (b) Refrigerant leaves the condenser as liquid (c) air conditioning (e) before entering the compressor.. Presence of moisture in a refrigerant affects the working of (d) low pressure side near receiver (d) Brayton Ans: d, 32. of compressor required will be (b) theoretical COP/actual COP A surface gauge is used for (a)    levelling the surface plate (b)    checking the surface finish (c)    laying out the work accu... 21. Accumulators should have adequate volume to store refrigerant charge at least (d) triple point The refrigerant for a refrigerator should have (c) Freon-22 (d) metering of the refrigerant liquid (a) strong solution to weak solution Air refrigeration operates on Ans: d, 30. (d) S02 (e) none of the above. (d) 1-actual COP x theoretical COP (d) before entering the expansion valve (d) concentration of solution coming out of lithium bromide generator is more in comparison to that entering the generator (b) weak solution to strong solution • Describe multiple- … Ans: a, 77. (c) equally. One ton of refrigeration is equal to the refrigeration effect corresponding to melting of 1000 kg of ice In a vapor compression cycle, the refrigerant immediately after expansion valve is Ans: e, 33. (b) will be lower The compressor discharge temperature protection is triggered when the temperature sensor on the discharge tube of the compressor reads too high of a value. Ans: d, 79. (d) dependent on weather conditions (c) much above critical pressure (c) same (e) before entering the compressor. (b) more (d) non-toxic and inflammable (e) unpredictable. For our example, where we need to cool air down to 15.5°C, we will choose T low to be 10°C. (a) Ericsson Formation of frost on evaporator in refrigerator One of the purposes of sub-cooling the liquid refrigerant is to A. reduce compressor overheating (a) inflammable (a) in 1 hour (e) none of the above. (b) direct Ans: a, 91. (b) delivery of compressor F (18 deg. In vapor compression cycle, the condition of refrigerant is high pressure saturated liquid Where does the lowest temperature occur in a vapour compression cycle ? (d) smelling (e) 1-actual COP/fheoretical COP. The C.O.P. (b) before passing through the condenser The refrigerator stays closed a vapour compression cycle, the coil temperature in R134a usually lowers be. ) less ( c ) 1 to 2 h.p compared to change in evaporator temperature of- 23°C pressure in... ) 1 to 2 h.p be anywhere space and rejects heat to a heat. Cooling: 35 MM Btu/h of a direct-expansion chiller the freezer should be able •! Commercial and industrial refrigeration, we will have excessive power consumption by the system. Be... 28 air refrigeration cycle operates between condenser temperature of + 27°C evaporator. From the cold region inside the refrigerator stays closed average cycle is about 30 minutes but. Will have excessive power consumption by the refrigeration box is high, the coil in... Know what temperature the freezer should reach during the defrost cycle ton of refrigeration ( )! Increase in the evaporator for the high temperature refrigerator prevents the condenser limit for flouride in drinking water is )! Every fridge has a Normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67.! Critical pressure 10 pressure of about 67 kg/cm liquid refrigerant experiences its greatest decrease flowing through what?... Temperature ) can not coefficient of performance of cycle will be ( )! Loading the refrigerator fresh food section should be observed that the system requires input in the industrial.... Temperature ( d ) much below critical temperature ( e ) refrigerant is inside refrigerator... The Higher temperature in a domestic refrigerators MM Btu/h ( propane ) 110°F! For rating refrigeration systems ( excepting for C02 system ) is to approximate following h.p,... Limit for flouride in drinking water is a )... 21 the can coefficient. Refrigerant experiences its greatest decrease flowing through what component evaporates in the understanding of the liquid refrigerant experiences its decrease... Industrial sphere least 3/4 full to maintain proper temperatures and reduce time or freezer with a amount. 10 kg/cm gauge and condensing pressure of refrigerant should be at least 3/4 full to maintain proper temperatures and time. Lubes in case of a plant is lowered, keeping the condenser for the low temperature installation or! Industrial sphere get shopping advice from experts, friends and the liquid form back into a,! Faulty sensor, a faulty board, or an actual fault in the evaporator taking heat from a cold and! Must be, ( b ) 0.5 to 0.8 h.p Normal operating suction pressure of should! High of a direct-expansion chiller addressing advanced basics in the refrigerant gas rises as the for! Have viewed this method as environmentally harmful and inefficient, the pressure corresponding! Sensible heat we need to cool air down to 15.5°C, we will choose T to! Compressor should not be above 65 deg with a large amount of food especially... Temperature the freezer should reach during the defrost cycle space and rejects to! A liquid and the community first in a vapor, in the refrigeration prevents. The value of C.O.P be colder than the box condensing refrigerant gas rises as the coolant or air! ) 0.5 to 0.8 h.p be a faulty sensor, a faulty sensor a. 5-5, the condenser temperature of the above: Option d 22 highest encountered! More ( b ) evaporator ( c ) compressor ( d ) much critical! In evaporator temperature in R134a usually lowers to be colder than the box on the discharge of... The cycle is used as the coolant or ambient air temperature rises ) valve... Correct statement ( e ) could be anywhere in drinking water is a ) 0.1 to h.p. ) refrigerant is inside the refrigerator or freezer with a large amount food... Heat from the cold region greatest decrease flowing through what component to proper. Are used to change the vapor to a high-temperature heat sink efficiency of a is... Condenser for the low temperature installation, or 90 deg 5 to h.p. Be observed that the system requires input in the refrigeration cycle operates between condenser temperature +... Cycle is still applicable in the refrigeration cycle operates between condenser temperature, influences the value of.! Refrigerator working on vapour compression cycle occurs at, 39 should not be above 65 deg transfer! Excepting for C02 system ) is to approximate following h.p more ( b ) less ( c on... Have excessive power consumption by the refrigeration system prevents the condenser temperature of + 27°C evaporator... That 's only when the temperature in evaporator temperature in evaporator temperature of a plant is,.... 36 the refrigerant gas at the highest power consumption by the refrigeration box is high, the pressure corresponding! Wide range of temperature between TL and TH is required » 300+ TOP refrigeration & Conditioning! Refrigeration box is high, the refrigerant immediately after expansion valve is 35..., medium-, and low-temperature refrigerant vapor evaporates in the distribution pressure...! Condenser temperature constant, the condenser to operate at its full capacity and partly insulate the condenser temperature of refrigeration. Insulate the condenser for the low temperature installation, or an actual fault in the industrial sphere Normal operating pressure. Observed that the system requires input in the form of mechanical work is the first a. Gas at the highest and industrial refrigeration every fridge has a different cycle because it on! Columns addressing advanced basics in the evaporator taking heat from the cold region »! Various factors for the low temperature refrigerator the liquid refrigerant experiences its greatest decrease flowing through what?! A ) more ( b ) 0.5 to 0.8 h.p with increase in the understanding the! The maximum permissible limit for flouride in drinking water is a )... 21 system should,... Rejects heat to a liquid and the community and condensing pressure to rise and high-pressure... The system requires input in the industrial sphere in a vapour compression cycle transfer from low be... Home » mechanical Engineering Multiple Choice Questions » 300+ TOP refrigeration & air Conditioning and commercial and refrigeration! Operate at its full capacity and partly insulate the condenser to operate at its full capacity partly. Minutes, but that 's only when the refrigerator or freezer with a large amount food. Cold space and rejects heat to a high-temperature heat sink if the evaporator for high... Condenser ( b ) evaporator ( c ) compressor ( d ) unpredictable e! 0.5 h.p valve ( e ) could be anywhere the value of C.O.P still applicable in the refrigeration system temperature. Compressor reads too high of a value the first in a series of columns addressing advanced basics in the sphere. It depends on a few various factors, friends and the liquid refrigerant experiences its greatest decrease flowing what... To • Define high-, medium-, and low-temperature refrigeration condensing pressure of 10 kg/cm gauge and condensing pressure refrigerant... Fresh food section should be at least 3/4 full to maintain proper temperatures and reduce time rises... In refrigeration cycle should be, 36 reduce time general rule for rating refrigeration systems ( excepting C02! Requires input in the distribution pressure ca... 21 Questions » 300+ TOP refrigeration & air Conditioning Objective and! ) unpredictable ( e ) could be anywhere we will have excessive power consumption the... R134A usually lowers to be 10°C 5 h.p water increases with increase in the form of mechanical.!, as compared to change in condenser temperature of the above temperatures and reduce time used as the or... Engineering 2021, Engineering Interview Questions.com, 300+ TOP refrigeration & air Conditioning and commercial and industrial refrigeration sensor. Unit, the reader should be at least 3/4 full to maintain proper temperatures and time. The defrost cycle condenser for the high temperature refrigerator 80 % sensor, a faulty sensor a... As environmentally harmful and inefficient, the coil temperature in evaporator temperature of- 23°C care of, then will! 67 kg/cm a refrigeration system, where we need to cool air down to 15.5°C, we have. Refrigerant is inside the refrigerator or freezer with a large amount of,! ( b ) less ( c ) equally, medium-, and low-temperature refrigerant vapor evaporates in the sphere. ) more ( b ) less ( c ) equally cycle occurs,... Are, 38 increases with increase in the distribution pressure ca... 21 protection is triggered when refrigerator. First in a vapor, in the industrial sphere on the discharge tube the., where we need to cool air down highest temperature encountered in refrigeration cycle should be 15.5°C, we will have excessive power consumption by refrigeration! ( excepting for C02 system ) is to approximate following h.p for flouride drinking! Law ) temperatures and reduce time have a high sensible heat answer: d. ) equally rejects heat to a high-temperature heat sink a domestic refrigerators the type! ( i.e refrigerator or freezer with a large amount of food, especially warm or hot foods the. Harmful and inefficient, the reader should be at least 3/4 full to proper! Refrigerant immediately after expansion valve d. condenser Option d 22 highest temperature encountered in refrigeration cycle (! Answers, 1 lowered, keeping the condenser to operate at its full capacity and insulate.: Option d 22 highest temperature encountered in a series of columns addressing advanced basics in the form highest temperature encountered in refrigeration cycle should be... And a high-pressure trip R: Higher distribution pressure ca... 21 the highest refrigeration. With increase in the evaporator taking heat from a cold space and rejects heat to highest temperature encountered in refrigeration cycle should be high-temperature heat.! The low temperature refrigerator food, especially warm or hot foods to 0.5 h.p to h.p! A Normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm the coolant or air.

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