engineering recuitment HPCL Engineer Mock Test 2024 Refrigeration and Air Conditioning Refrigeration Cycles and Devices
Which of the following statements are true?
a. R-12 is not used due to ozone depletion problem
b. R-13 is not preferred for blood storage at as low as -90°C
c. R-21 is suitable for automobile air-conditioning.
d. R-22 is the most widely used refrigerant for large central air-conditioning installations.1
Only a and b are true
2
Only a, c and d are true
3
All a, b, c and d are true
4
Only b, c and d are true