Unit 10

Charging a refrigeration system refers to ____.

• removing refrigerant from a system

• adding refrigerant to a system

• cleaning the refrigerant

• vaporizing the refrigerant

Refrigerant in vapor form is normally put into the system through the ____.

• liquid line

• suction line

• hot gas line

• liquid return line

When charging a system with vapor refrigerant from a refrigerant cylinder, the cylinder will become ____.

• cold

• very warm

• the same temperature as the ambient air

• warm

Refrigerant in liquid form is normally put into the system through the ____.

• liquid line

• suction line

• hot gas line

• liquid return line

When charging liquid refrigerant from a single valve supply cylinder, the cylinder is placed ____.

• upside down

• right side up

• on its side

• in any position indicated

A graduated cylinder charging device is a device that ____.

• measures refrigerant by volume for precise refrigerant charging

• has a compensation dial for adjusting for the temperature of the refrigerant

• often has a heater to keep the refrigerant temperature from dropping when refrigerant is released into the system

• All of the above.

If 22 oz. of refrigerant are to be added to a refrigeration system and the supply cylinder weighs 24 lb. 12 oz. before any is added, what will be the supply cylinder weight after the system has been charged?

• 23 lb 12 oz

• 22 lb 12 oz.

• 23 lb 6 oz.

• 22 lb 6 oz.

If 30 oz. of refrigerant are to be added to a refrigeration system and the supply cylinder weighs 26 lb. 4 oz. before any is added, what will the supply cylinder weigh after the system has been charged?

• 22 lb 8 oz.

• 24 lb 6 oz.

• 24 lb 8 oz.

• 22 lb 4 oz.

If a critically charged refrigeration system is overcharged, which of the following is a likely result?

• Increased cooling capacity.

• Reduced compressor discharge temperature.

• Increased system efficiency.

• Increased operating pressures.

Fractionation occurs when ____.

• some of a blended refrigerant evaporates or condenses before the rest of the blend

• when only a fraction of the total charge has been added to a system

• the operating pressures of a system increase

• Both a and c.