Self-Test A-1.1: Characteristics of Gas Appliances 

Complete Self-Test A-1.1 and check your answers.

1. The internal characteristics of a gas appliance include types of burners, ignition systems, controls, and safeties.
   1. True
   2. False

    

2. “High efficiency” type appliances use what type of gas burner?
   1. Non-mechanical
   2. Mechanical
   3. Atmospheric
   4. Natural draft

    

3. What is the purpose of a pilot flame?
   1. Light the main burner
   2. Heat the flame supervisor
   3. Light the basement
   4. Prime the flue

    

4. Which of the following are common components of the main burner control circuit?
   1. Thermostat
   2. High temperature limit
   3. Main gas valve
   4. All of the above

    

5. What is an example of a non-vented gas appliance?
   1. Boiler
   2. Furnace
   3. Incinerator
   4. Range

    

6. What type of appliance takes all of the air for the appliance directly from the outside, as well as discharging all the flue gas directly to the outdoors?
   1. Indirect-vent
   2. Direct-vent
   3. Indirect flue
   4. Direct flue

    

7. What is the purpose of a direct fired make-up air unit?
   1. Preheats ventilation air
   2. Space heating applications
   3. Preheats domestic water
   4. Raises boiler efficiency

    

8. For every pound of water condensed from the flue gas, the heat exchanger of a condensing appliance gains approximately how many BTU’s of heat energy?
   1. 144
   2. 324
   3. 970
   4. 1,700

    

Answer Key: Self-Test A-1.1 is on the next page.