Electrician Practice Tests

If the system has a normal charge of 80 pounds, which of the following is the method to charge this system?

In which of the following combination the pressure relief valves should not installed?

The R-12 refrigeration system which uses water cooled condenser should be charged first with vapor pressure of at least ………… before switching to liquid charging.

Which of the following component directly following the evaporator in the refrigeration system?

The leak check should be done on heat pump that uses R-410A with ………..

The compressor should be isolated before changing the compressor on a system containing R-410A then evacuate the compressor section to ……………… ……………… and hold. If the system pressure does not rise, remove the compressor.

What should be done when you reach required recovery vacuum on a system?

Which of the following condition the reciprocating compressor should not be energized?

Every refrigeration system should be protected by ……………………..

What is the non-operating pressure inside a R-410 refrigerant system at room temperature 72 ⁰F?

Which of the following condition the oil sample should be taken from refrigeration system?

Which of the following does the recovered refrigerant from refrigeration system contains?

which of the following is a measuring unit of deep vacuum in a system?

The recovery process of liquid refrigerant is ……………….. than vapor refrigerant?