Refrigeration & Air-Conditioning Questions And Answers

Refrigeration & Air-Conditioning Questions And Answers

Q. The COP of a Carnot refrigeration cycle decreases on what?

Ans. Increasing the upper temp. and decreasing the lower temp.

Q. The correct sequence of vapour compression(VC) Vapour Absorption(VA) and Steam Injection(SE) refrigeration cycles in increasing order of the COP is....

Ans. VA, SE, VC

Q. Flash chamber is used in refrigeration for which one of following?

Ans. Effective inter cooling medium for purpose of increasing COP

Q. The significant advantage of using Ammonia as a refrigerant is its

Ans High Latent Heat

Q. Which refrigerant mostly used in mostly all domestic and car air-conditioners now a days

Ans. R-134a

Q. The color of the flame of halide torch,in a case of leakage of Freon refrigerant,will change to...

Ans. Orange

Q. Which refrigerant has the highest critical temperature?

Ans. Water

Q. In on-off control refrigeration system, which one of the following expansion device is used?

Ans. Thermostat
Interim Dividend

Q. Which is the main process which takes place in a desert-cooler?

Ans.Adiabatic Saturation

Q. If the measured wet-bulb temperature and the thermodynamic wet-bulb temp.are equal, then the non dimensional number with a value of unity is...

Ans. The Lewis Number

Q. In an ideal vapour compression refrigeration cycle, the enthalpy of the refrigerant before and after the evaporator are respectively 75 KJ/KG and 180 KJ/KG. The circulation rate of the refrigerant for each of refrigeration is....?

Ans. 2 kg/min

Q. When the mixture of refrigerant is used to replace a refrigerant , if the cop increase, the attributed is..

Ans. Increase in cooling effect

Q. Which of the following thermodynamic process is adopted in the process of summer air-conditioning?

Ans. Cooling and de humidification

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