Thermostat Quiz

In simplest terms, a thermostat is a sensing device that reacts to _____.

• airflow

• humidity

• pressure

• temperature

A thermostat that remembers set points and adapts system operation and cycles accordingly is a _____ thermostat.

• learning

• master

• power-stealing

• Wi-Fi

The type of HVAC system operation that regulates the increase or decrease of intensity and can result in significant energy usage reduction over time is _____ operation.

• lockout

• modulating

• on-off

• None of the above.

The longer a bimetal coil is, the _____.

• less bending movement it can produce

• longer it will stretch

• more bending movement it can produce

• shorter it will stretch

A switch used with a bimetal coil that consists of a pair of contacts in a glass tube that changes position based on magnets is a _____ switch.

• mercury

• reed

• rod and tube

• thermocouple

A switch used with a bimetal coil that consists of a glass tube containing wire contacts and a puddle of liquid metal and that changes position based on its physical position is a _____ switch.

• mercury

• reed

• rod and tube

• thermocouple

Electronic thermostats use a ______ to sense air temperature.

• bimetal helix

• sensing bulb and bellows

• sensing bulb and diaphragm

• thermistor

In the event of a mercury spill, ______.

• call local hazardous material disposal agency

• flush the mercury down the toilet

• scoop up the mercury by hand

• vacuum the mercury puddle

Identify each of the sensing elements shown.

The difference between a heating-only thermostat with two wires and a heating-only thermostat with three wires is the addition of a(n) ______.

• automatic venting circuit

• cut-out circuit

• holding circuit

• reversing circuit