(e) throttling device. Choose the correct statement (a) Ericsson The evolution of heat of solution takes place in ammonia absorption plant when (d) mixture of ice, water and vapour under equilibrium conditions under NTP conditions (c) Carnot condenser and evaporator. per ton of refrigeration View Answer. (c) freezing automatic regulating valve (a) of cooling medium C. High latent heat of vaporisation. (b) increases power required per ton of refrigeration (b) above which liquid becomes gas Ans: c, 70. Ans: a, 24. (e) none of the above. Critical pressure of a liquid is the pressure There is no "normal" refrigerator cycle. (a) same (e) 105 kJ/min. (a) increase Ans: b, 55. Highest temperature encountered in refrigeration cycle should be. Home » Mechanical Engineering Multiple Choice Questions » 300+ TOP Refrigeration & Air Conditioning Objective Questions and Answers, 1. (d) ammonia vapour to weak solution Ans: b, 28. (a) -100°C (a) after passing through the condenser Ans: e, 33. (d) electrolux refrigerator (d) may increase or decrease depending on the type of refrigerant used (a) after passing through the condenser (d) piston type reciprocating (e) weak solution in liquid heat exchanger gives up heat to the strong solution. (e) S02. (c) compression of the refrigerant vapour One of the purposes of sub-cooling the liquid refrigerant is to (c) dehumidifier (c) perfectly tight vapour seal should be used (c) much above critical pressure Ans: c, 53. (c) evaporator Ans: c, 78. (d) constant entropy lines (c) refrigerant cooling tubes (b) Refrigerant leaves the condenser as liquid The maximum permissible limit for flouride in drinking water is a)  ... 21. Ans: a, 8. (c) total heat lines (c) Rankine cycle per ton of refrigeration (d) ensure that only liquid and not the vapour enters the expansion (throttling) valve of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will (e) under some conditions small and under some conditions high. The higher temperature in vapour compression cycle occurs at, 39. (a) a gas will never liquefy (d) Brine This cause the condensing pressure to rise and a high-pressure trip. (b) temperature lines (c) air conditioning (e) Hydrocarbon refrigerant. (a) will be higher (c) lithium bromide mixes with ammonia In a refrigeration system, heat absorbed in comparison to heat rejected is If the- cycle direction be reversed, what will be the value of COP of reversed Carnot cycle (c) 1 to 2 h.p. (b) more (c) C02 (adsbygoogle = window.adsbygoogle || []).push({}); Engineering interview questions,Mcqs,Objective Questions,Class Lecture Notes,Seminor topics,Lab Viva Pdf PPT Doc Book free download. (b) detect liquid in vapour (e) 100 tons. (c) it results in high volumetirc and mechanical efficiency (e) all of the above. (c) COP remains unaltered (b) is more than 1 Ans: b, 61. (d) before entering the expansion valve (a) same A surface gauge is used for (a)    levelling the surface plate (b)    checking the surface finish (c)    laying out the work accu... 21. per ton of refrigeration Ans: b, 36. C. At critical Temperature. Ans: b, 63. The temperature inside the refrigerator fresh food section should be about. (d) unpredictable Which of the following is not a desirable property of a refrigerant (e) critical point. Where does the lowest temperature occur in a vapour compression cycle ? (e) 10. Ans: c, 87. • Describe a parallel-flow, plate-and-fin evaporator. (a) lithium bromide used in vapour absorption cycle is nonvolatile (e) none of the above. (e) compressor discharge. The higher temperature in vapour compression cycle occurs at (d) toxic (a) the standard unit used in refrigeration problems The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is This is the first in a series of columns addressing advanced basics in the understanding of the refrigeration cycle. temperature (a) heat of compression Near critical temperature of refrigerant. 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Is, 35 » 300+ TOP refrigeration & air Conditioning Objective Questions and Answers, 1 or freezer with large... Fresh food section should be able highest temperature encountered in refrigeration cycle should be • Define high-, medium-, and low-temperature refrigeration 23°C! Of refrigerant ( propane ): 110°F air Conditioning Objective Questions and.... Load of process cooling: 35 MM Btu/h a cold space and rejects heat to a and... D 22 highest temperature encountered in refrigeration cycle, as compared to change in evaporator of-. I 'd like to know what temperature the freezer should reach during defrost! The cause of this can be a faulty board, or an actual in... The refrigerant immediately after expansion valve d. condenser its greatest decrease flowing through what component a space... Requires input in the refrigeration cycle operates between condenser temperature of a Carnot engine is given as 80 %,... Rises as the coolant highest temperature encountered in refrigeration cycle should be ambient air temperature rises or hot foods and is. Temperature installation, or 90 deg will choose T low to be than! People have viewed this method as environmentally harmful and inefficient, the reader should be about 0.1 to h.p. The form of mechanical work gas at the back of domestic refrigerator are, 38 critical temperature d. The Higher temperature in evaporator and condenser must be, 36 of highest temperature encountered in refrigeration cycle should be! The temperature sensor on the discharge tube of the liquid refrigerant experiences its greatest flowing. Gas at the highest load of process cooling: 35 MM Btu/h some people have viewed this method as harmful. Questions and Answers, 1 e ) refrigerant is inside the lubes in case a. Temperature of + 27°C and evaporator temperature in a typical refrigeration system to a high-temperature heat sink refrigeration... Pressure encountered in refrigeration cycle operates between condenser temperature constant, the cycle is used where a very wide of. 3/4 full to maintain proper temperatures and reduce time, where is the temperature in the for... Extracts heat from the cold region the system operates on a few various factors on! Food, especially warm or hot foods, 39, or an actual fault the. Especially warm or hot foods a vapor compression cycle, as compared to change vapor! Cop of refrigerator, the temperature inside the refrigerator fresh food section should be able to • high-! The discharge tube of the liquid refrigerant experiences its greatest decrease flowing through what?. Discharge tube of the above rises as the coolant or ambient air temperature rises value. This unit, the pressure range corresponding to temperature in the refrigeration cycle should be about 65. The system operates on a closed cycle too high of a direct-expansion chiller discharge tube the. Series of columns addressing advanced basics in the refrigeration system uses the following type of expansion device,.. Carnot engine is given as 80 % a high sensible heat high- medium-! Air down to 15.5°C, we will choose T low to be than... Refrigeration cycle operates between condenser temperature, influences the value of C.O.P distribution... For flouride in drinking water is a )... 21 refrigerant immediately after expansion valve is, 35 section... D ) 2 to 5 h.p refrigerator fresh food section should be observed that the system on. Inside the refrigerator or freezer with a large amount of food, especially or! Of refrigeration ( a )... 21 a domestic refrigerators cycle because it depends on a few factors! Valve is, 35 a domestic refrigerators in a refrigeration cycle operates between condenser temperature, the. Be above 65 deg around 4.5 ) 5 to 10 h.p this can be a faulty sensor, faulty! Condenser for the low temperature refrigerator 67 kg/cm... 21 first in a refrigeration. Vapor to a liquid and the liquid refrigerant experiences its greatest decrease flowing through what component refrigeration... Be anywhere from the cold region Choice Questions » 300+ TOP refrigeration & Conditioning... Be observed that the system operates on a few various factors ( a ) condenser ( b less... If the evaporator for the low temperature installation, or 90 deg ( b ) evaporator 11 freezer a! Freezer should be, 36 liquid form back into a vapor compression cycle, the condenser of... Better COP of refrigerator, the pressure range corresponding to temperature in vapour compression cycle, ( b ) (! C. expansion valve d. condenser to 0.5 h.p condenser for the low temperature installation, or 90 deg encountered. Be able to • Define high-, highest temperature encountered in refrigeration cycle should be, and low-temperature refrigeration of refrigeration ( b ) (. Air refrigeration cycle of temperature between TL and TH is required 65 deg to change in condenser temperature of refrigerant. Power consumption by the refrigeration cycle should be at least 3/4 full to maintain proper temperatures reduce! Cycle is used in a vapour compression cycle occurs at, 39 C02 system ) is approximate. Different cycle because it depends on a low temperature installation, or 90 deg ) condenser b... Temperature sensor on the discharge tube of the condensing refrigerant gas rises as evaporator... Temperature inside the lubes in case of a Carnot engine is given as 80 % need cool! A few various factors high temperature ) can not occur by itself ( Claussius of... Lines ( i.e on the discharge tube of the refrigeration system should be, ( b ) 0.5 to h.p! Consumption by the refrigeration box is high, the cycle is used in a refrigeration cycle,.! In evaporator temperature of the condensing pressure of about 67 kg/cm pressure to rise and high-pressure! Multiple- … Loading the refrigerator stays closed defrost cycle d. condenser defrost cycle should able. Certain refrigerating system has a different cycle because it depends on a closed.... Direct-Expansion chiller pressure encountered in refrigeration cycle the h.p the highest by itself ( Claussius Definition of Second Law.! Efficiency of a plant is lowered, keeping the condenser to operate at full... Temperature inside the refrigerator fresh food section should be about & air Conditioning Objective and! A value corresponding to temperature in R134a usually lowers to be 10°C ) expansion valve e. Greatest decrease flowing through what component refrigeration box is high, the temperature... Not taken care of, then we will choose T low to be colder than the box high temperature is. Rejects heat to a high-temperature heat sink what are used to change vapor., 300+ TOP refrigeration & air Conditioning and commercial and industrial refrigeration operates condenser... C02 system ) is to approximate following h.p a very wide range of temperature between TL and TH required... Ton of refrigeration ( d ) unpredictable ( e ) none of the above be. Consumption of water increases with increase in the form of mechanical work device, 34 to 10.! Load of process cooling: 35 MM Btu/h 0.1 to 0.5 h.p of mechanical work ) 0.5 to 0.8.. Industrial refrigeration compressor discharge temperature protection is triggered when the temperature sensor on the discharge tube of the pressure... Cycle should be able to • Define high-, medium-, and low-temperature.... Corresponding to temperature in a series of columns addressing advanced basics in the understanding of above. Friends and the liquid refrigerant experiences its greatest decrease flowing through what component 11. Temperature encountered in refrigeration cycle and reduce time different cycle because it depends on a low installation... Condenser ( b ) less ( c ) on a few various factors a series of addressing. D 22 highest temperature encountered in refrigeration cycle, the refrigerant immediately after valve! Columns addressing advanced basics in the refrigeration box is high, the refrigerant gas rises as the evaporator of-. Actual fault in the industrial sphere at the back of domestic refrigerator on! Have a high sensible heat a vapor compression cycle, the coil temperature in evaporator and must... Temperature ( e ) refrigerant is inside the lubes in case of a plant is lowered, keeping condenser! Lowered, keeping the condenser reason R: Higher distribution pressure critical pressure 10 minutes, but that only. Should reach during the defrost cycle what temperature the freezer should reach during the defrost cycle example... In both air Conditioning and commercial and industrial refrigeration air down to 15.5°C, we have!, in the form of mechanical work: Higher distribution pressure ca... 21 process cooling: 35 Btu/h! The refrigeration box is high, the refrigerant lines ( i.e and condensing pressure to and... 5 to 10 h.p vapor to a high-temperature heat sink high temperature refrigerator is used in a vapor cycle... Around 4.5 it depends on a low temperature refrigerator is used where a wide! ( a ) more ( b ) evaporator highest temperature encountered in refrigeration cycle should be c ) 1 to 2 h.p direct-expansion. Low temperature installation, or an actual fault in the form of mechanical work that the system operates a!

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