Gas Heating Study Guide

In some furnaces, an opening in the flue, called a(n) ____, helps keep constant pressure in the combustion chamber and prevents ambient air from reaching the furnace flame.

• Bonnet

• Flame Rectifier

• Draft Regulator

• Air Break

With no excess air dilution, the ultimate carbon dioxide content for natural gas is approximately ____.

• 1.5%

• 47.6%

• 11.9%

• 31.9%

The maximum concentration of carbon monoxide (CO) permitted in furnace flue gas is ____.

• 1 ppm

• 20 ppm

• 100 ppm

• 400 ppm

Which of the following statements about atmospheric gas burners is FALSE?

• They are usually constructed of steel

• They vary in length and size

• Those used in older furnaces did NOT have adjustable air shutters

• They use the siphoning action of gas flow to induce airflow

An ignition system that burns and monitors its pilot light only while the thermostat is calling for heat is a(n) ____.

• Direct-spark ignition system

• Intermittent- pilot ignition system

• Hot- Surface Ignition System

• Standing- Pilot ignition System

An ignition system that uses an electric spark to ignite the gas burners is a(n) ____.

• Direct- Spark ignition system

• Intermittent- pilot ignition system

• Hot- Surface Ignition System

• Standing- Pilot Ignition System

An ignition system that uses a high- resistance heating element to light the gas burners directly is a(n) ____.

• Direct- Spark Ignition System

• Intermittent- pilot ignition system

• Hot- surface ignition system

• Standing- Pilot ignition System

Which of the following statements regarding rollout switches is TRUE?

• They are located near the burners

• They are used to cut off the supply of fuel gas when a flame rollout occurs

• They must be reset manually

• All of the above

A device that may be used to detect combustion blower operation is a(n) ____.

• Sail Switch

• Pressure Switch

• End Switch

• All of the above

Which of the following statements regarding furnace efficiency is FALSE?

• Higher efficiency is achieved by keeping more condensation in a system

• The higher the AFUE rating, the more efficient a furnace is

• A furnace's AFUE rating is printed on a label attached to the furnace.

• None of the above