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GATE ME 2022: Refrigeration & Air conditioning (App update required to attempt this test)
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Question 1
In a cascade refrigeration cycle two refrigerator is working in series with COP 5 and 3. If this refrigerator is running by a Carnot engine having temperature limit 600K and 300K. and heat supplied to the Carnot engine is 2 Kw, then find the refrigeration effect (kW)
Question 2
A heat engine is operating between two temperatures having 60% efficient. If a refrigerator is used to work under similar temperature and is required to have a refrigeration effect of 2 ton then find the work input to the refrigerator in Kw
Question 3
Atmospheric air at 40℃ DBT & 50%RH is passed over a cooling coil at the rate of 600
/hr at exit from the coil. The air is saturated and its temperature is 8℃. The condensate also leaves at 8℃. Determine the amount of condensate leaving the coil/min. Assume specific heat of saturated steam 1.88kJ/kgK. Saturation pressure at DBT of 40℃ & 8℃ are 7.38kPa and 1.685kPa
/hr at exit from the coil. The air is saturated and its temperature is 8℃. The condensate also leaves at 8℃. Determine the amount of condensate leaving the coil/min. Assume specific heat of saturated steam 1.88kJ/kgK. Saturation pressure at DBT of 40℃ & 8℃ are 7.38kPa and 1.685kPa Question 4
In a sample of moist air at standard atmospheric pressure of 101.325 kPa and 26 °C, the partial pressure of water vapour is 1.344 kPa. If the saturation pressure of water vapour is 5.36 kPa at 26 °C, then what are the humidity ratio and relative humidity of moist air sample?
Question 5
In a cooling tower, the DBT and WBT of air is 28°C and 23°C respectively while the temperature of water at inlet and outlet states is 32°C and 24°C respectively. The approach and range (in °C) in cooling tower respectively is
Question 6
In R-12 refrigerant reciprocating compressor operates between a condensing temperature of 30° C and evaporator temperature of -10° C. The clearance ratio of the compressor is 0.03.Find the mass flow rate in kg/s if the actual displacement rate is 7.58 ×10-3 m3/s. Use the below data.
v(m3/kg)
Compressor inlet 0.1089
Compressor outlet 0.027
Enter the value accurate up to 2 decimals .
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