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These short solved questions or quizzes are provided by Gkseries. – Refrigerant R134a is a hydro fluorocarbon (HFC) that has zero potential to cause the depletion of the ozone layer and very little greenhouse effect. a. to increase the refrigerating effect b. to reduce the mass of vapour formed during expansion process c. to reduce vapour bubbles which obstruct the flow of liquid refrigerant d. all of the above The refrigerant used is (a) Ammonia (b) Carbon dioxide (c) Freon (d) Brine (e) Hydrocarbon refrigerant. d. All of the above. Loss of forest has led to. These short solved questions or quizzes are provided by Gkseries. may increase or decrease depending on the type of refrigerant used ⇒ The alignment circle is marked on the psychrometric chart at. Subject: Automobile Engineering 5. One tonne of refrigerant is used. 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One tonne of ice when melts from at 0 0 C in 24 hours,the refrigeration effect produced is equivalent to 210 kJ/min ⇒ The automobile radiator is a heat exchanger of. due to its excellent safety properties. It readily evaporates and condenses or changes alternatively between the vapor and liquid phase without leaving the refrigerating plant. 76. Sulfur dioxide: Sulfur dioxide was widely used as refrigerant during the early 20th century. Carbon dioxide is widely used as a refrigerant in mechanical systems refrigerant, marine services, hospitals, etc. a. Engines Test contains around 20 questions of multiple choice with 4 options. (A) A refrigerant should have low latent heat (B) If operating temperature of system is low, then refrigerant with low boiling point should be used (C) Pre-cooling and sub-cooling bf refrigerant are same (D) Superheat and sensible heat of a refrigerant are same The Following Section consists Multiple Choice Questions on Automobile Engineering. a. 59. 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