Can any body help me answear these questions? Im studying for my certification its hard as hack. I hape many more questions if yo can please help me out you can email me at email@example.com
1.when recharging a refrigeration system with R-11 what vapor pressure is necessary in the shells befour charging with liquid?
A.21.1'' Hg vacuum
B.19.7'' Hg vacuum
C.18.1'' Hg vacuum
D.16.9'' Hg vacuum
2. where is the lowest access point on the low pressure centrifugal air-conditioning appliance?
A. the evaporator charging valve
B. the condenser service valve
C. the compressor cooler jacket
D. the purge unit exhaust port
3. After system servicing, why is refrigerant vapor re-introduced to the refrigeration system befour refrigerant liquid?
A. vapor charging increases pressure slowly, preventing failure of the rupture dick.
B. vapor charging is faster than liquid charging
C. liquid charginf is more difficult to control then vapor charging.
D. liquid charged into a deep vacuum will boil and may lower temperatures enough to freeze water in the tubes.