Question 1

The pressure switch may be connected in series with the compressor, or in series with the compressor control relay, depending on the type of ____.&#10;A) application&#10;B) control circuit&#10;C) discharge&#10;D) suction

Accepted Answer

control circuit

Question 2

Most of the pressure switches used for commercial or industrial systems are adjustable.

Accepted Answer

Most pressure switches used in commercial or industrial systems have adjustable set points to allow for customization and control over the system's operation.

Question 3

The low-pressure switch is connected to the discharge side of the compressor.

Accepted Answer

The low-pressure switch is connected to the suction side of the compressor.

Question 4

High- and low-pressure switches are used to ____ the amount of pressure in an air conditioning and refrigeration system.&#10;A) set&#10;B) modulate&#10;C) simulate&#10;D) sense

Accepted Answer

High- and low-pressure switches are used to sense the amount of pressure in an air conditioning and refrigeration system, allowing for system control and protection.

Question 5

Most of the pressure switches used for air conditioning are operated by a bellows.

Accepted Answer

Most pressure switches used for air conditioning are operated by a sealed bellows that expands or contracts depending on the pressure changes in the system.

Question 6

The low-pressure switch is a normally open ____.&#10;A) held-closed switch&#10;B) single pole switch&#10;C) toggle switch&#10;D) rocker switch

Accepted Answer

A low-pressure switch is a type of held-closed switch. This means that the switch remains closed when there is no pressure or very low pressure in the system, and it opens when the pressure reaches a predetermined level. This is important for protecting the compressor and other components in the system from damage due to low pressure or loss of refrigerant. Therefore, the best choice is A - held-closed switch.

Question 7

The pressure settings are different for different types of refrigerant.

Accepted Answer

The pressure settings for refrigerant depend on the type of refrigerant used in the system. Different refrigerants have different pressure-temperature relationships and require different pressure settings for optimal system operation.

Question 8

High- and low-pressure switches generally use a ____, which expands and contracts with a change of pressure.&#10;A) switch&#10;B) spring&#10;C) bellows&#10;D) strip

Accepted Answer

High- and low-pressure switches typically use a bellows, which is a type of sealed metallic container that expands and contracts with pressure changes. The movement of the bellows triggers the switch to turn on or off.

Question 9

Nonadjustable pressure switches are ____ found on central units designed for residential use.&#10;A) commonly&#10;B) only&#10;C) rarely&#10;D) always

Accepted Answer

Nonadjustable pressure switches are commonly found on central units designed for residential use.

Question 10

In a high-pressure switch, the bellows is connected to the suction side of the compressor.

Accepted Answer

In a high-pressure switch, the bellows is connected to the discharge side of the compressor.

Deck 30: Pressure Switches