HVAC State Test Prep 06

Chemicals used for refrigerants can be broken down into two groups:

• organic and inorganic
• liquid and solid
• water and ice
• none of these

Hydrocarbons include propane, ethane, and _________.

• methane
• isobutane
• butane
• ethane

R-12 refrigerant boils at _________ degrees F.

• 212
• -21.6
• -28.3
• 32

A refrigerant with a low boiling point will have a _________ vapor pressure and vice versa.

• high
• low
• cold
• medium

HCFC-22 is almost identical to _________.

• HFC-22
• HFC-12
• CFC-12
• CFC-13

Future refrigerants will be limited to _________ with no chlorine.

• LCPs
• CFCs
• HCFCs
• HFCs

ASHRAE 34 is the standard for which the International Mechanical Code classifies _________.

• refrigerants
• water
• liquids
• solids

Recovered refrigerants must be filtered and _________ before being used to recharge the unit from which removed.

• dried
• reconfigured
• decontaminated
• purified

Azeotropes do not exhibit the temperature glides of zeotropic mixtures. New HFC azeotropes are now being accepted in _________ use.

• commercial
• industrial
• agricultural
• residential

Temperature glide is the difference between the dew point and the bubble points of the refrigerant at any given _________.

• time
• pressure
• suction
• point