Question 1

Why is it a good idea to remove Schrader stems from service valves prior to evacuation?

Accepted Answer

The answer of Why is it a good idea to...

Question 2

Explain why triple evacuations are not normally performed on large systems.

Accepted Answer

The answer of Explain why triple evacuations are not normally...

Question 3

Why is nitrogen considered a "noncondensable" gas?

Accepted Answer

The answer of Why is nitrogen considered a "noncondensable" gas?...

Question 4

When moisture is present in a refrigeration system, it will react with the refrigerant and the oil to form ____.

Accepted Answer

A)  carbon dioxide 
B)  acid 
C)  carbon monoxide 
D)  carbolic acid

Question 5

While under a deep vacuum, any liquid water under the oil in the motor-compressor assembly can be removed by operating the compressor motor for several seconds without any adverse effect on the system.

Accepted Answer

A) True 
 B)False

Question 6

Noncondensable gases ____.

Accepted Answer

A)  are desirable in a refrigeration system 
B)  are undesirable in a refrigeration system 
C)  condense readily under normal atmospheric conditions 
D)  help in pulling a vacuum

Question 7

Why must all valves be opened when an evacuation is performed?

Accepted Answer

The answer of Why must all valves be opened when...

Question 8

A compound gauge ____.

Accepted Answer

A)  indicates pressures above 14.696 psia 
B)  indicates pressures in inches Hg below atmospheric pressure 
C)  is one of two gauges on a typical gauge manifold 
D)  All of the above.

Question 9

Micron gauge displays can be electronic analog, digital, or  ____________________.

Accepted Answer

The answer of Micron gauge displays can be electronic analog,...

Question 10

To pull a vacuum means to ____.

Accepted Answer

A)  raise the pressure in a refrigeration system 
B)  lower the pressure in a refrigeration system below atmospheric 
C)  allow refrigerant to escape into the atmosphere 
D)  condense the gas in the system

Question 11

Sludge is produced when moisture, acid, and ____________________ are present in the system.

Accepted Answer

The answer of Sludge is produced when moisture, acid, and...

Question 12

A micron gauge is used to measure ____.

Accepted Answer

A)  atmospheric pressures at high altitudes 
B)  atmospheric pressures at sea level 
C)  absolute pressures below 1 mm Hg 
D)  high pressure in a refrigeration system

Question 13

A deep vacuum involves reducing the pressure in a refrigeration system to a micron gauge reading of ____________________ or below.

Accepted Answer

The answer of A deep vacuum involves reducing the pressure...

Exam 8: Leak Detection, System Evacuation and System Clean-Up