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GATE ME 2022: Refrigeration & Air conditioning 1 (App update required to attempt this test)
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Question 1
During a refrigeration cycle heat is rejected by the refrigerant in a:
Question 2
The COP of a Carnot heat pump operating between 6 °C and 37 °C is .........
Question 3
A refrigerator uses R-134a as its refrigerant and operates on an ideal vapour-compression refrigeration cycle between 0.14 MPa and 0.8 MPa. If the mass flow rate of the refrigerant is 0.05 kg/s, the rate of heat rejection to the environment is kW.
Given data:
At P = 0.14 MPa, h = 236.04 kJ/kg, s=0.9322 kJ/kg-K
At P = 0.8 MPa, h = 272.05 kJ/kg (superheated vapour)
At P = 0.8MPa, h = 93.42 kJ/kg (saturated liquid)
Given data:
At P = 0.14 MPa, h = 236.04 kJ/kg, s=0.9322 kJ/kg-K
At P = 0.8 MPa, h = 272.05 kJ/kg (superheated vapour)
At P = 0.8MPa, h = 93.42 kJ/kg (saturated liquid)
Question 4
Ambient air is at a pressure of 100 kPa, dry bulb temperature of 30oC and 60% relative humidity. The saturation pressure of water at 30oC is 4.24 kPa. The specific humidity of air (in g/kg of dry air) is __________ (correct to two decimal places).
Question 5
In a certain ideal refrigeration cycle, the COP of the refrigerator is 3. The cycle under ideal conditions running as heat engine will have efficiency equals to
Question 6
A carnot refrigerator operates between the thermal reservoirs at -250C and 350C. If the capacity of the unit s 5 tons of refrigeration, determine the power consumed by the refrigerator ________(in kW).
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