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51.SSC JE (ME)II Refrigeration and Air Conditioning Booster Quiz-4
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Question 1
The value of heat rejection ratio is 1.5 and the value of refrigeration effect is 2000 kJ/min, then the value of heat rejected across the condenser in kJ/min and COP of the system is:-
Question 2
A refrigerator is used to convert 1kg of liquid water at 30°C into ice at –18°C . The refrigerator rejects heat to surroundings at 30°C . The Cp of liquid water is 4.18 kJ/kgK and ice is 1.9 kJ/kgK, latent heat of fusion of water is 335 kJ/kg. The minimum work required is (in kJ)
Question 3
A one ton capacity water cooler cools water steady from 35°C to 23°C . The specific heat of water is 4.2 kJ/kg–K. The water flow rate is ___________.
Question 4
In an Electrolux refrigerator, a thermosiphon bubble pump is used to lift the _________.
Question 5
It is desired to condition the outside air from 30% RH and 5°C dry bulb temperature to 50% RH & 25% dry bulb temperature. The practical arrangement will be __________.
Question 6
The optimum effective temperature for human comfort is,
Question 7
If air flows over a cooling coil, dehumidification air will take place if the coil surface temperature is below the following of the entering air
Question 8
In summer, air may be cooled and dehumidified by spraying chilled water to air in the form of mist. The minimum temperature to which air may be cooled is the
Question 9
Which one of the following compressors will be used in vapour compression refrigerator for plants up to 100 tonnes capacity __________?
Question 10
Which type of valve is generally used in reciprocating refrigerant compressors?
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