Heating Systems Quiz

What is the first step in the sequence of operation for a gas furnace?

• The gas valve opens

• The blower fan starts

• The thermostat calls for heat

• The flame sensor activates

What is the primary function of the inducer blower in a gas furnace?

• To ignite the burners

• To circulate warm air through ducts

• To move exhaust fumes out of the heat exchanger

• To shut down the furnace if overheating occurs

How does the pressure switch contribute to the gas furnace operation?

• It verifies that the inducer blower is running correctly

• It ignites the gas burners

• It circulates air through the heat exchanger

• It prevents the furnace from overheating

What does the flame sensor in a gas furnace detect?

• Carbon monoxide levels

• Gas pressure levels

• The presence of a flame

• The temperature of the heat exchanger

When does the blower fan turn on in a gas furnace?

• Immediately after the thermostat signals for heat

• After the flame sensor detects a flame and the firebox heats up

• At the same time as the gas valve opens

• When the inducer blower stops

What happens at the end of a heat cycle in a gas furnace?

• The thermostat signals shut down, and the gas valve closes

• The blower stops immediately

• The thermostat turns off the igniter first

• The furnace shuts down without cooling

How does an electric furnace generate heat?

• By burning fuel

• By using heating elements powered by electricity

• By using an external heat exchanger

• By converting air pressure into heat

What is the function of a sequencer in an electric furnace?

• It controls the gas valve

• It turns on heating elements in stages

• It shuts down the furnace when overheating occurs

• It powers the blower motor

What is the purpose of safety switches in an electric furnace?

• To speed up the heating process

• To allow all heating elements to activate at once

• To monitor the furnace and shut it down if necessary

• To increase power efficiency

Why is a pressure switch important in a furnace system?

• It prevents overheating

• It verifies proper ventilation before ignition

• It turns on the blower motor

• It detects gas leaks