CSLB Class B General Contractor's License Practice Exam

What component senses temperature in a conditioned space and manages air handling equipment accordingly?

1. Thermostat

2. Humidity sensor

3. Pressure gauge

4. Flow switch

The correct answer is: Thermostat

The correct choice is the thermostat. A thermostat is a crucial component in HVAC (heating, ventilation, and air conditioning) systems that monitors the temperature of a conditioned space. It performs the vital function of sensing the ambient temperature and allowing the user to set a desired temperature. When the temperature deviates from this set point, the thermostat activates or deactivates the air handling equipment to maintain comfort levels. For example, if the room temperature rises above the set point, the thermostat would signal the air conditioning system to cool the space down. Conversely, if the temperature drops below the set point, the thermostat would activate the heating system. In contrast, devices like humidity sensors specifically measure moisture levels in the air and do not directly manage temperature. Pressure gauges measure the pressure within systems but are not related to temperature control. Flow switches monitor the flow rate of liquids or gases but also do not manage temperature. Thus, the specific function of the thermostat in regulating temperature and managing air handling equipment makes it the correct answer for this question.