Combination burners use:

Combination burners use:

a. Two different gas burners arrangements
b. Two different pilot flames
c. Two different fuels
d. Two different air supplies





Answer: C

Premix Percentage is the another name for:

Premix Percentage is the another name for:

a. The quantity of gas in the air/gas mixture
b. Primary air
c. Secondary air
d. The quantity of gas in the secondary air

Answer: B

Which features do Motorized Gas Valves have? 1. Slow to open, quick to close 2. Quick to open, slow to close 3. Fail-safe 4. Spring and supply pressure to close 5. Spring and supply pressure to open

Which features do Motorized Gas Valves have?
1. Slow to open, quick to close
2. Quick to open, slow to close
3. Fail-safe
4. Spring and supply pressure to close
5. Spring and supply pressure to open

a. 1, 4
b. 1, 3, 4
c. 2, 3, 4
d. 2, 5
e. 1, 3, 5





Answer: B

To prevent a furnace puff, larger size solenoid type oil and gas valves usually have a delayed opening action so that it takes __ seconds to open the valve up wide, but they close instantly when de-energized.

To prevent a furnace puff, larger size solenoid type oil and gas valves usually have a delayed opening action so that it takes __ seconds to open the valve up wide, but they close instantly when de-energized.

a. 1 to 3
b. 4 to 5
c. 2 to 4
d. 5 to 7
e. 6 to 8





Answer: B