Intro refrigeration Test 3 (Week 14)

When adding refrigerant to a newly evacuated system, which of the following is the best method?

• Add vapor refrigerant to the system through the liquid-line service valve

• Add liquid refrigerant to the system through the liquid-line service valve

• Add liquid refrigerant to the system through the suction-line service valve

• Add vapor refrigerant to the system through the suction-line service valve

Tags

NGSS.HS-PS3-4

When charging a system with vapor refrigerant, what can be done to increase the pressure in the refrigerant tank?

• Place the tank in a bath of warm water

• Heat the tank with an oxyacetylene torch

• Open both the high-side and low-side valves on the gauge manifold

• Turn the tank upside down

Tags

NGSS.HS-PS3-4

As a system is charged with vapor refrigerant, the refrigerant tank will likely

• experience a pressure rise and a temperature drop.

• Experience a pressure rise and a temperature rise.

• experience a pressure drop and a temperature drop.

• experience a pressure drop and a temperature rise.

Tags

NGSS.HS-PS3-4

A system's total refrigerant charge can be found on

• the nameplate of the outdoor unit of a split-type heat pump system.

• the nameplate of the indoor unit of a split-type air-conditioning system.

• the nameplate of the outdoor unit of a split-type air-conditioning system.

• the nameplate of a package-type air-conditioning system.

Automatic charging capability, auto-stop features, alarms, and wireless remotes are features that are found on some

• analog gauge manifolds.

• analog charging scales.

• digital gauge manifolds.

• refrigerant charging scales.

Tags

NGSS.HS-PS3-3

Before a full graduated charging cylinder is used to charge a system, it should be

• calibrated based on the vacuum level.

• evacuated to at least 500 microns.

• turned upside down for liquid charging.

• calibrated based on the cylinder pressure.

The term "blend" refers to a refrigerant that

• a. is made up of two or more different refrigerants.

• b. has a boiling temperature above 0°F at 0 psig.

• c. has a boiling temperature below 0°F at 0 psig.

• d. has a single saturation temperature at a given pressure.

When a portion of a refrigerant blend evaporates or condenses before the rest of the same blend, what is occurring?

• Pressurization

• Sublimation

• Fractionation

• Condensation

Which of the following statements is true regarding azeotropes and zeotropes?

• a. They both have no temperature glide.

• b. They are both refrigerant blends.

• c. Neither one experiences fractionation.

• d. They can both be charged as a vapor.

When refrigerant leaves a storage tank as a liquid and enters the system as a vapor, what process is taking place between the system and the gauge manifold?

• Condensing

• Fractioning

• Restricting

• Gliding

Tags

NGSS.MS-PS1-4