155 Gas heat quiz 2

A combination gas valve is a gas valve that has been combined with which of these?

• Pilot valves

• Gas regulators

• Pressure regulators

• Natural valves

What type of gas valve is an NC valve with a plunger used to open the valve?

• Solenoid valve

• Heat motor valve

• Diaphragm valve

• Straight plate valve

What type of gas valve has an electric heating element or resistance wire wound around a rod attached to a valve?

• Heat motor-controlled valve

• Solenoid valve

• Diaphragm valve

• Straight plate valve

Which of the following is a feature of heat exchangers?

• Many burners are located at the bottom

• They have slow and inconsistent transfer of heat

• They are made of durable plastics

• Sections each have six or seven burners running simultaneously

A technician repairing a gas furnace noticed that the heat exchanger has an acidic condensation running down the flue pipe that is deteriorating the flue system. What is likely causing this problem?

• There is too much airflow across the heat exchanger

• There is not enough airflow across the heat exchanger

• The flue gasses are too hot

• The heat exchanger has overheated

What kinds of tubes does a heat exchanger typically have?

• Both L-shaped and S-shaped tubes

• Both T-shaped and O-shaped tubes

• Only L-shaped tubes

• Only O-shaped tubes

A technician servicing gas furnaces notices that when the gas furnace kicks on, it blows cold air. The technician thinks this is happening because air is blowing out into the duct system before the heat exchanger can produce warm air. What is likely causing this cold air problem?

• The fan switch is turning on the blower before the air is hot

• The limit switch will not allow the heat exchanger to warm up

• The heat exchanger is broken

• The pilot is igniting too quickly

When a gas furnace overheats, which type of switch has a heat-sensing element and closes the main gas valve?

• Limit switch

• Fan switch

• Pilot switch

• Heat switch

In a flame rectification system, the pilot flame can conduct electricity. Why is this possible?

• The pilot flame contains positively and negatively charged particles

• The pilot is between neutrons

• The electrodes are the same size

• The pilot flame is lit on a steel burner

If a pilot flame or main flame does not light during a normal call for heat on a gas furnace, then which of the following may be the issue?

• The ignition system is faulty

• The flame rectification system is broken

• The pilot is not supposed to light, and therefore is not broken

• The electricity is not flowing to the flame rectification system