Type Of Refrigerant Vacuum Pump Quiz

There are ________ microns in 1 mm Hg.

Refrigerants that damage the ozone layer contain an element called ________.

When refrigerant cylinder is connected to an operating system, the pressure in the cylinder will be ________ than the suction pressure of the system.

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

The DOT-approved cylinder in which refrigerant may be recovered has a mechanism for shutting the recovery system off when it reaches approximately ________ full.

The fastest way to remove refrigerant from a system is with the refrigerant in a ________.

The refrigerant in vapor form is added to the system through the ________ side of the system.

The temperature sensitive resistor commonly used in a vacuum gauges is called a ________.

Only two substances should be in the refrigeration system for proper operation.  They are ________ and ________.

The ________ is used to help technicians perform a number of tasks including taking pressure readings on the high side of the system and trapping all of the system refrigerant in the receiver to perform system service.

When using a "standing pressure test" for leak-checking, ________ should never be used since an explosive mixture can be created.

The sensing element of a micron gauge must always be mounted with the fitting at the ________.

The charging device that holds refrigerant, has a visible column of liquid, and can be used to "visually" see the amount of refrigerant used is called the ________.

The trapping of the Earth's heat in the atmosphere which is causing global warming is called the ________.

Ozone is produced mainly by a process called ________ .

As refrigerant vapor is removed from a supply cylinder, the pressure in the supply cylinder will ________.

Production of CFC refrigerants became illegal on ________.

The small amount of refrigerant released when removing gauge hoses from the system is called ________.

A manufacturer's charging chart may be used when available to determine the correct charge for a system.

• True

• False

The fine for venting refrigerant into the atmosphere can be as high as ________ per day.

Air entering a refrigerant system can eventually lead to compressor failure.

• True

• False

The DOT-approved cylinder used for recovering refrigerant is gray and yellow.

• True

• False

Sludge is a produced when ________, ________, and ________ are present in the system.

The maximum recommended pressure for leak testing is 150 psig.

• True

• False

One good feature of an electronic charging scale is that it counts upward as refrigerant is removed, to tell the the technician how much refrigerant was used.

• True

• False

Using a restrictor, liquid refrigerant can be charged into the low-side of the system with the system operating.

• True

• False

HCFC-based blends work best with ________ lubricants, while HFC-based blends work best with ________ lubricants.

When taking a temperature reading of a copper suction line, it is important to insulate the sensing element to give a more accurate reading.

• True

• False

What effect is ozone depletion having on the environment?

• Increased ground level ozone (smog)

• Reduced marine life

• Reduced crop fields

• All of the above

A refrigerant reclaimed from a system may be charged back into the system from which it came.

• True

• False

Glide is the range of temperatures/pressures in which a blended refrigerant will condense.

• True

• False

To pull a vacuum means to ________.

• Raise the pressure in a refrigeration system

• Lower the pressure in a refrigeration system below atmospheric

• Allow refrigerant to escape into the atmosphere

• Condense the gas in the system

Charging a refrigeration system refers to ________.

• Removing refrigerant from a system

• Adding refrigerant to a system

• Cleaning the refrigerant

• Vaporizing the refrigerant

When working on a refrigeration or air-conditioning system, along with tools and test equipment, the service technician, to avoid penalty, must have a ________ or ________  on the job site.

Refrigerant in vapor from is normally put into the system through the ________.

• Liquid line

• Suction line

• Hot gas line

• Liquid return line

It is possible to have a leak-free system when under a vacuum but still leak when the system pressure is above atmospheric.

• True

• False

Mechanical refrigerant recovery equipment must meet specification established by the 1993 ARI 740 standard.

• True

• Flase

When technicians works for a company in which the technician does not have a financial interest, the technician does not have to be certified.

• True

• False

Noncondensable gases ________.

• Are desirable in a refrigeration system

• Are undesirable in a refrigeration system

• Condense readily under normal atmospheric conditions

• Help in pulling a vacuum

Which of the following refrigerants is considered an HFC-type of refrigerant?

• R-134a

• R-12

• R-22

• R-11

The abbreviation for refrigerants containing chlorine, fluorine, carbon, and hydrogen is ________.

• HFC

• HCFC

• CFC

• HFAC

The abbreviation for refrigerants containing fluorine, carbon, and hydrogen is ________.

• HFC

• HCFC

• CFC

• HFAC

The oil in a vacuum pump should be changed after each time it is used.

• True

• False

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

The abbreviation for refrigerants containing chlorine, fluorine, and carbon is ________.

• HFC

• HCFC

• CFC

• HFAC

When adding refrigerant in vapor form to a refrigeration system, the system motor/compressor assembly is running.

• True

• False

When the system pressures are lower than the pressure in the refrigerant tank, such as when the system has just been evacuated or if the system is out of refrigerant, refrigerant can be added to both the high and low pressure sides of the system.

• True

• False