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(d) at which refrigerant gas becomes liquid (a) saturation point of vapor (a) domestic refrigerators (d) weak solution mixes with strong solution Ans: a, 77. (b) direct Ans: e, 4. (d) may increase or decrease depending on the type of refrigerant used Ans: d, 92. Ans: d, 21. (c) – 33.3°C Highest pressure encountered in a refrigeration system should be, (b) much below critical pressure 10. (c) 5 (c) 1 to 2 h.p. (c) indirect The vapor compression refrigerator employs the following cycie (a) results in loss of heat due to poor heat transfer (e) unperdictable. (c) same Cooling water is required for following equipment in ammonia absorption plant of a refrigeration cycle with lowering of condenser temperature, keeping the evaporator temperature constant, will For obtaining high COP, the pressure range of compressor should be Fig.5-5: A 2-stage cascade refrigeration cycle. (b) Carnot A household refrigerator is a combination of refrigerator-freezer. This cause the condensing pressure to rise and a high-pressure trip. Highest temperature encountered in refrigeration cycle should be (a) ammonia vapour goes into solution Ans: e, 20. (a) same The maximum permissible limit for flouride in drinking water is a)  ... 21. The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy-diagram represents (d) dependent on weather conditions (e) constant volume lines. (b) takes place at constant temperature (d) there is no such consideration (e) none of the above. (c) remain unaffected (e) there is no such restriction. (b) high total heat (c) equal to atmospheric pressure (b) safety relief valve ). Ans: c, 78. Which of the following is not a desirable property of a refrigerant Temperature of process fluid: −10°F. (e) heat transfer. (d) absorption The suction pipe diameter of refrigerating unit compressor in comparison to delivery side is 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. (e) before entering the compressor. Question is ⇒ Highest pressure encountered in a refrigeration system should be, Options are ⇒ (A) critical pressure of refrigerant, (B) much below critical pressure, (C) much above critical pressure, (D) near critical pressure, (E) there is no such restriction., Leave your comments or Download question paper. (e) dual cycle. (d) expansion valve. (e) condensing temperature of ice. (d) more/less depending on rating The bank of tubes at the back of domestic refrigerator are Ans: d, 83. (d) wet vapour (a) Tow specific heat of liquid (b) NH3 Ans: e, 12. (d) expansion valve (b) before passing through the condenser A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm.

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