HVAC 105 Study Guide - 50 Questions

The high and low pressures in a refrigeration system are separated by the:

• Condenser and metering device

• Evaporator and compressor

• Metering devise and compressor

• Filter drier and liquid line

The pressure at which the refrigerant changes state, from a vapor to a liquid is the:

• Evaporation pressure

• Superheated perssure

• Back pressure

• Condensing pressure

A pressure gauge placed anywhere, from the metering device to the compressor will read:

• The low side or evaporating pressure

• The head pressure

• The total high pressure

• The sub cooling

Most modern refrigerants exist either in:

• (a) The saturated vapor state

• (b) The saturated liquid state

• Answers (a) and (b) are true

• Solid state

In an operating system, you should have liquid and vapor in the:

• Evaporator only

• Condenser only

• Compressor

• Evaporator and condenser

The term, Refrigerant "Conditions" refer to which of the following?

• Saturated, superheated or subcooled refrigerant

• Pressurized refrigerant only

• A system in a complete vacuum

• The outdoor ambient temperature

The heat energy that causes a liquid refrigerant to change to a vapor at a constant saturation temperature for a given pressure is referred to as:

• Sensible heat

• Latent heat

• Superheat

• Subcooled

The temperature/pressure chart is only good when the refrigerant is in the:

• Saturated liquid state only

• Saturated vapor state only

• Superheated saturated state only

• Liquid and vapor mixed

Superheat always refers to:

• (a) A liquid refrigerant

• A vapor

• (c) A mixture of liquid and vapor

• Both (a) and (c)

Subcooling always refers to:

• A vapor cooled elow its saturation temperature

• A liquid cooled below its saturation temperature

• The refrigerant that cools the compressor

• The flashing of refrigerant at the metering device