Practice Test GeeksG3 - Gas Technician Level 3 Certification Practice Test
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Properties of Fuel Gases Flashcards

6 cards from real G3 practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. What is the ignition temperature of natural gas?

    Answer: 593°C (1,100°F)

    Natural gas ignites at approximately 593°C (1,100°F).

  2. How does propane's specific gravity differ from natural gas?

    Answer: Propane is heavier than air (SG ~1.52); natural gas is lighter (SG ~0.60)

    Propane sinks (SG ~1.52); natural gas rises (SG ~0.60).

  3. What is propane's heating value compared to natural gas?

    Answer: Propane has approximately 2.5 times the value per cubic foot

    Propane delivers about 2,520 BTU/ft³ versus natural gas at about 1,000 BTU/ft³.

  4. What is the flammable range of propane in air?

    Answer: 2.1% to 9.5%

    Propane's flammable range is approximately 2.1% to 9.5%.

  5. What determines flame speed and why does it matter?

    Answer: Rate a flame front travels through gas-air mixture; affects burner design

    Flame speed affects burner port sizing and flame stability.

  6. What is the chemical equation for complete methane combustion?

    Answer: CH4 + 2O2 → CO2 + 2H2O

    Complete combustion: CH4 + 2O2 → CO2 + 2H2O.