B.P.S.C. CDPO (Pre) 2005
What causes cooling in an air conditioner?
aBy compressing and releasing gas✓ Correct
bBy evaporation of water
cBy compressing water
dBy compressing a solid
Explanation
An air-conditioner generally has an air-cooling unit and an air-heating unit. The air-heating unit increases heating when the air temperature falls below a fixed point, and when the temperature becomes higher, the air-cooling unit brings the air to the set level through cooling. The air-cooling unit is a compressor-type mechanical refrigeration unit.
general-science