06. ACR-105 UNIT 14 REVIEW QUESTIONS

The temperature drop below the thermostat’s set point is referred to as system lag.

• True

• False

  
  

A glass bulb containing mercury and a set of switch contacts can be found in which of the following controls:

• Pressure control

• Low-voltage thermostat

• Line-voltage thermostat

• Pressure transducer

Low voltage is desirable for residential control voltage because it offers more precise control, safety, economics, and, in many states, a license is required to install or service low-voltage wiring.

• True

  
  

• False

A heating thermostat________on a rise in temperature.

• vibrates

• closes

• opens

• expands

A cooling thermostat______on a rise in temperature.

• expands

• opens

• vibrates

• closes