What in the most accurate instrument for checking a deep vacuum? compound gauge

Question

What in the most accurate instrument for checking a deep vacuum? compound gauge mercury "U" tube manometer mercury barometer electronic vacuum gauge To insure accurate testing, the best material to use for connecting lines to the vacuum pump and gauge _______ light flexible hose heavy duty rubber gauge line copper tube garden hose A multiple evacuation means that ___________. you connect three vacuum pumps simultaneously to a refrigeration system and pull a vacuum you pull a vacuum on three different systems at the same time you pull a vacuum on a refrigeration system more than once, allowing refrigerant or nitrogen into the system between each procedure there must be more than one system operating before a vacuum can be pulled Moisture in a liquid state must be _______ before it can be removed with a vacuum pump. Vaporized condensed cooled solidified How many chlorine atoms does it take to destroy 100,000 ozone molecules in the stratosphere? 10 1 100 10.000 Which of the following refrigerants is a CFC-type refrigerant? R-22 R-123 R-134a R-12 Which of the following is an example of an HCFC refrigerant? R-12 R-402 R-22 R-134a

Explanation / Answer

8.) electronic vaccum gauge

9 ) copper tubes

10) You pull a vacuum on a refrigeration system more than once, allowing refrigerant or nitrogen into the system between each procedure

11 ) vapourised

12.) correct option is 1 molecule.

13.) R-12

14.) R-22

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