which of the following refrigerant has the lowest boiling point

The Refrigeration and Air Conditioning question and answer are mostly asked in all competitive exams. The boiling point of ammonia is (A) -10.5 C. (B) -30.5 C. (C) -33.3 C. (D) -77.6 C. 61. 3.4 Published Ratings. Sulphur dioxide . Propane is the best at -42°C. In a domestic vapour compression refrigerator, the refrigerant commonly used is Solve it.. 10. (Refrigerant) the following: List-I A. C. or lower is a non-azeotropic refrigerant mixture which comprises a base refrigerant and R-14 wherein R-14 is contained in an amount of 5 . D) all of these. In following refrigerant, which has the lowest freezing point? Calculate the S(univ) for the following phase change at 25 deg celcius. a.are located in the stripping section of the distillation column b.are referred to as heavy ends c. have the lowest boiling point of all the fractions of the column. A. Among the following refrigerants, which is having the lowest C.O.P for refrigeration system working under the temperature limits of -15°C and 30°C as evaporator and condenser temperature respectively? Question No : 143 The boiling point of ammonia is . Which of the following refrigerant has the lowest boiling point? 9. Ethanol, CH 3CH 2OH (mw=46) has a boiling point of 78º. Hence, C u 2 + polarise Cl − ions more than C u +, Therefore, C u C l 2 has more covalent character and hence, its boiling point is less. Which of the following is not a desirable property of a refrigerant? Of the given compounds, which compound is not a constitutional isomer of the other three compounds? condenser and compressor . A-10.5°C . 8. Among the following refrigerants, which is having the lowest boiling point? gives noisy operation gives quiet operation requires little power consumption cools below 0° C ⇒ During sensible cooling of air, the relative humidity . CH3CH2CH (CH3)2 OD.CH3CH2CH2CH2OH O E. CH3CH2CH2CH2CH3. The heat of vaporization for ether is 26.69 kJ/mol. During sensible cooling of air, the relative humidity increases. The wet-bulb depression is ____. Question is ⇒ Which of the following refrigerant has the lowest boiling point?, Options are ⇒ (A) Ammonia, (B) Carbon dioxide, (C) Sulphur dioxide, (D) R-12, (E) , Leave your comments or Download question paper. R-502 has thelowestboiling temperature atatmosphericpressure. Ammonia 4. when the system pressure are lower than the pressure in the refrigerant tank, such as hen the system has just been evacuated or the system is out of refrigerant, refrigerant can be added to botht he high and low sides of the system. 1.The condensing pressure due to the presence of non condemnable gases, as compared to that actually required for condensing temperatures without non condemnable gases, unpredictable. O A. CH3OCH (CH3)2 B.CH3CH20CH2CH3 OC. Which of the following refrigerant has the lowest boiling point? Liquids have only one free surface. Heat is . R-502 has thelowestboiling temperature atatmosphericpressure. Sulphur dioxide. Which of the following refrigerants has the lowest boiling temperatures at atmospheric pressure? What is the correct relation between boiling points of the following alkyl iodides, where R=methyl, R'=ethyl and R"=propyl? Q35. Highly toxic and flammable C. Highest freezing point D. Highest critical List-ll 1. Which of the following refrigerants has the lowest boiling temps at atmospheric pressure? Answer Explanation. . R-22; Ammonia; R-11; R-118; Which of the following is an example azeotrope refrigerant? R-502 2. In actual air-conditioning applications for R-12 and R-22, and operating.. a. R-12 b. R-22 c. R-134a d. R-502. Option A: High risibility with oil Option B: Low boiling point Option C: Good electrical conductor Option D: Large latent heat . Option-1 : Booster. . 0 votes . Both of these compounds have the same numbers and types of atoms. . power per TR is low mass of refrigerant circulated in the system is low mass of the refrigeration equipment is low ⇒ A vapour absorption refrigeration system. What happens when room temperature soda is poured into a glass of ice? The boiling point of a refrigerant should be low enough at atmospheric pressure to keep the system pressure above 0 psig when operating at low temperatures. Which of the following refrigerant has the lowest boiling? . The ice melts because it is giving up the "cold" to the soda c. The ice melts because it is absorbing heat from the . 2 | P a g e Option B: Carbon dioxide Option C: Sulphur dioxide Option D: R-12 Q7. A statement of the assigned values of those performance characteristics, under stated Rating Which refrigerant has the lowest freezing point * R 11 R 22 R 12 ammonia? which lies between the wet bulb and dew point temperatures of the incoming stream. class-12; halogen-containing-compound; Share It On Facebook Twitter Email. The unit used to measure electrical power is the ____. Which of the following refrigerants has the lowest boiling temperatures at atmospheric pressure? A-10.5°C . 88 199 ratings Problem Details. a. raises the boiling point of the refrigerant b. pumps the refrigerant throughout the system c. both a and b d. none of the above. A Ammonia . designated refrigerant (see Section 8.2) with a boiling point in the range of -50 to +10 C, the rate will be measured for R-22, or the lowest boiling point refrigerant if R-22 is not a designated refrigerant. It has long been used in a variety of air-conditioning and refrigeration applications in a variety of markets, including appliance, construction, food . The refrigerant in a refrigeration system changes state in the _____. Option A: Ammonia . Answers Alkenes have physical properties (low boiling points, insoluble in water) quite similar to those of their corresponding alkanes. A. Boiling points of common materials. C. through −150 deg. Ammonia. 5. 1) Production of R11 or CFC-11 was halted by the clean air act on January 1, 1996 2) Production of R12 or CFC-12 (Dichlorodifluoromethane) was halted by the clean air act on January 1, 1996 3) R22 or HCFC-22 is a single component HCFC refrigerant with low ozone depletion potential. Chemistry questions and answers. B) Ammonia. A) 3,3-dimethyl-1-butyne B) 1-hexyne C) 2-hexyne D) 3-hexyne E) 1-decyne . Which of the following refrigerants has the lowest boiling point? High critical temperature. Expert Answer. R-502; R-100; R-40; R-14; The boiling point of R-12 is-29° C; 20.5° C-73.6° C; 9° C; Which of the following refrigerant is flammable and highly toxic? Answer is: . Carbon dioxide 3. R32 refrigerant is the short name for CH2F2 (difluoromethane). answered Aug . The dry bulb temperature during sensible heating of air. If the food is cold, the bacteria in it cannot work quickly so the food is fresh for a long time. R-22 pressure CODE Ch3nh2 bp -6 while methanol 65. Option-2 : CO2. The refrigerant enters the evaporator coils in liquid state and leaves as vapour. Boiling point of water: 100 °C / 212 °F Boiling point of water (in Kelvin): 373.2 K Boiling point of ethanol: 78.37 °C / 173.1 °F Boiling point of methanol: 64.7 °C / 148.5 °F Boiling point of acetone: 56 °C / 132.8 °F Boiling point of alcohol: 78.37 °C / 173.1 °F Boiling point of nitrogen: -195.8 . Which one of the following alkyl halides has the lowest boiling point . Which of the following refrigerant has the lowest boiling point. Science. C. High latent heat of vaporisation. B. C. in a refrigerating system equipped with a heat exchanger; a non-azeotropic refrigerant mixture which attains a low temperature of −100 deg. A Ammonia . Suggest the percentage of outside air being circulated in the theatre: (A) zero (B) 20 (C) 50 (D) 100 32-Which of the following refrigerant has the lowest boiling point? The boiling point at atmospheric pressure (14.7 psia, 1 bar absolute) for some common fluids and gases can be found from the table below: Product. 2.The moisture in a refrigerant is removed by. Chemistry. The mixture may be impossible to reclaim. . A) 305 K B) 302 K C) 295 K D) 289 K E) 281 K Which of the following refrigerants has the lowest boiling temperatures at atmospheric pressure? Which of the following refrigerant has the lowest boiling point? Only _____ refrigerant should enter the metering device. . Option A: R-11 Option B: R-40 Option C: R-114 Option D: R-502 Q10. It can be boiled as low as -50 deg F before the boiling pressure goes into a vacuum. View Answer Discuss. b) -73.6°C. The boiling point of ammonia is 0 A.-10.5 C 0B.-30.5 C 0C.-33.3 C 0C.-77.6 C View Answer C.-33.30C Your Comments 9. The poorest choice for cold weather, with a -0.4°C boiling point, is butane vs isobutane at -11.75°C. Option A: Ammonia . Solution: Hydrogen chloride $ (HCl) $ has the lowest boiling point among halogen acids. What is the vapor pressure (in atm) of Freon-113 at 22.0 °C? As the refrigerant leaves the evaporator, the refrigerant has to be in 100 % vapour form , to avoid ingress of liquid refrigerant inside compressor as the liquid is . The human body feels comfortable when the heat stored in the body is Solve it.. 1 Answer. The index which corelates the combined effects of air temperature, relative humidity and air velocity on the human body, is known as In figure shown, E is a heat engine with efficiency of 0.4 and R is a refrigerator. The correct option is D The boiling point of alcohol (78°C or 351K) is lower than that of water (100°C or 373K), therefore, alcohol is more volatile than water. R-502. Ammonia, R -12 and Sulphur dioxide are hav ing boiling points as -33.3°C, -29°C and -10°C respectively. Unlock to view answer. Login into Examveda with . d. R-502. 129. In order to collect liquid refrigerant and to prevent it.. CH3OH He CH3Cl N2. A. Experts are tested by Chegg as specialists in their subject area. Which of the following refrigerant has the lowest boiling point? none of these. 316) In a domestic vapour compression refrigerator, the refrigerant commonly used is. The undesireable property of a refrigerant is. Latest 100 Refrigeration & Air Conditioning Objective Questions. Arrange the following in order of increasing boiling point. Physical properties of refrigerants - molecular weight, boiling, freezing and critical points. Answer is: compressor. (Refrigerant) the following: List-I A. Which has the highest boiling point and lowest freezing point? Add your answer and earn points. Without consulting tables, arrange the following alkenes in order of increasing boiling point: 1-butene, ethene, 1-hexene, and propene. Lower boiling point of refrigerant far enough below temp of the load to get needed heat transfer . a) Ammonia b) R - 12 c) Carbon dioxide d) Sulphur dioxide Answer: c Clarification: Boiling point temperature is a crucial property to carry out refrigeration. 2,3-dimethylpentane, 3-ethylpentane, 2,2-dimethylbutane, and 3-methylhexane. liquid. The magnitude of London dispersion forces decreases with a decrease in molecule size (carbon chain length and molecular surface area). Carbon dioxide. . 7. Which of the following refrigerant has the lowest boiling point? Question 79 : A liquied coolant or the refrigerant and used for the transmmission of heat without a change in its state is called. The boiling point of a refrigerant should be low enough . [Ammonia] [Carbon dioxide] [Sulphur dioxide] 9 people answered this MCQ question Carbon dioxide is the answer among Ammonia,Carbon dioxide,Sulphur dioxide for the mcq Which of the following refrigerant has the lowest boiling point system has high C.O.P. Sulphur dioxide. In following refrigerant, which has the lowest freezing point? which refrigerant has the lowest boiling point in atmospheric pressure .R-502; R-134a,R-22,R-12. A) CO 2. C7H16(l)--> C7H16(g) Delta S= +79.0j/k I know that the equation is Delta Suniv= DSsys + DSsurr but for . Which of the following refrigerants is highly toxic and flammable? A.Ammonia B.Carbon dioxide C.Sulphur dioxide D.Freon-12 View Answer B.Carbon dioxide Your Comments 10. Lowest boiling point B. Term. B-30°C . Among the given refrigerants, Carbon dioxide is having the lowest boiling point, valued at -73.6°C. Which of the following is an azeotrope refrigerant? Carbon dioxide. Login . (A) Carbon dioxide (B) Ammonia (C) Sulphur dioxide (D) Freon 12. Among the given refrigerants, Carbon dioxide is having the lowest boiling point, valued at -73.6°C. The effectiveness of the cooling tower is dependent on : The normal boiling point of ether is 307.8 K. Calculate the temperature at which its vapor pressure is exactly half of that at its normal boiling point. The answer I found was that: chemistry. 3. A non-azeotropic refrigerant mixture attains an extremely low temperature of −200 deg. CCl4 CHCl3 CH2Cl2 CH3Cl is the decreasing order of boiling point in haloalkanes. Freon-113, C 2 Cl 3 F 3, has an enthalpy of vaporization of 27.0 kJ/mol and a normal boiling point of 48.0 °C. But do you know exactly how the refrigerator keeps food so cold? Why is temperature glide important? Explain the difference in their boiling points. Which of the following refrigerants has lowest freezing point? Ammonia. D-77.7°C . B Carbon dioxide . Option-2 : Choll. Question No : 143 The boiling point of ammonia is . Therefore, the shortest, most branched molecule in this problem will have the lowest boiling point. It can be boiled as low as -50 deg F before the boiling pressure goes into a vacuum. Charge as a liquid through the low side using a restrictor. During sensible cooling of air, the relative humidity increases. Lowest boiling point B. The thermostatic expansion valve is also called . d) -68°C. Which of the following compounds has the lowest boiling point? This gas has less exposure to Global warming potential as compared to R22, and companies use it as a replacement for the same. The low boiling point allows the refrigerant to boil off into vapor at a lower temperature. The desirable property of a refrigerant is. R-502 2. C Sulphur dioxide . ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in the same mass of dry air when it is saturated at the same temperature and pressure, is called.humidity ratiorelative humidityabsolute humiditydegree of saturation⇒ Which of the following refrigerant has the lowest boiling point?AmmoniaCarbon . Ammonia; Sulphur dioxide; Carbon dioxide . The correct answer is isobutane, a four membered, branched hydrocarbon. R - 11, R - 12 . Q35 Q35. What is the vapor pressure (in atm) of Freon-113 at 22.0 °C? D-77.7°C . T or F. Which of the following refrigerants has the lowest boiling temperatures at atmospheric pressure? A low boiling point for -51 Degrees Celsius makes it perfect to use in low-temperature products. Chemistry Low boiling point. Ammonia. a) -20.5°C. ..fo 9) Which of the following alkynes has the lowest boiling point? Liquids show the property of diffusion. R-12. 9) Which of the following alkynes has the lowest boiling point? which of the following is NOT a characteristic of bottoms products? Ammonia; Sulphur dioxide; Carbon dioxide . Diethyl ether has a boiling point of 34.5C, and 1-butanol has a boiling point of 117C. C-33.3°C . Which of the following refrigerant has the highest freezing point. zero. Chemistry questions and answers. The reason being that a ether has very low boiling point (308 K). Get the detailed answer: Which refrigerant has the lowest boiling point in atmospheric pressure: R-502, R-134a, R-22, or R-12? Solve it.. 10 know exactly how the refrigerator -12 and Sulphur dioxide D! > Diethyl ether has a boiling point ( 308 K ) are commonly used is Solve it...! Will have the lowest boiling temps at atmospheric pressure 858.7 kPa, which is having the lowest boiling point <... Sensible heating of air refrigerant should be low enough how the refrigerator keeps food cold. 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