PROPANE PRACTICE TESTS Exam
2026/2027 | Actual Exam Questions &
Correct Answers
1. What is the chemical formula for propane?
Answer: C3H8
2. At room temperature and atmospheric pressure, propane exists as a:
Answer: Gas
3. When propane is compressed or cooled, it turns into a:
Answer: Liquid
4. Propane vapor is heavier or lighter than air?
Answer: Heavier
5. What odorant is commonly added to propane to detect leaks?
Answer: Ethyl mercaptan
6. The flammable range of propane in air is approximately:
Answer: 2.1% to 9.5%
7. What color is a propane flame when burning properly?
, Answer: Blue
8. A yellow or orange flame from a propane appliance indicates:
Answer: Incomplete combustion / lack of air
9. What is the primary hazard of propane?
Answer: Fire and explosion
10. Propane is stored in containers as a:
Answer: Liquid under pressure
11. At what temperature does propane boil at atmospheric pressure?
Answer: -44°F (-42°C)
12. What happens to liquid propane when it escapes to the atmosphere?
Answer: It rapidly vaporizes and becomes very cold (auto-refrigeration)
13. Propane is also known as:
Answer: Liquefied petroleum gas (LPG)
14. Which is heavier: propane vapor or air?
Answer: Propane vapor
15. When propane leaks, where does it tend to accumulate?
2026/2027 | Actual Exam Questions &
Correct Answers
1. What is the chemical formula for propane?
Answer: C3H8
2. At room temperature and atmospheric pressure, propane exists as a:
Answer: Gas
3. When propane is compressed or cooled, it turns into a:
Answer: Liquid
4. Propane vapor is heavier or lighter than air?
Answer: Heavier
5. What odorant is commonly added to propane to detect leaks?
Answer: Ethyl mercaptan
6. The flammable range of propane in air is approximately:
Answer: 2.1% to 9.5%
7. What color is a propane flame when burning properly?
, Answer: Blue
8. A yellow or orange flame from a propane appliance indicates:
Answer: Incomplete combustion / lack of air
9. What is the primary hazard of propane?
Answer: Fire and explosion
10. Propane is stored in containers as a:
Answer: Liquid under pressure
11. At what temperature does propane boil at atmospheric pressure?
Answer: -44°F (-42°C)
12. What happens to liquid propane when it escapes to the atmosphere?
Answer: It rapidly vaporizes and becomes very cold (auto-refrigeration)
13. Propane is also known as:
Answer: Liquefied petroleum gas (LPG)
14. Which is heavier: propane vapor or air?
Answer: Propane vapor
15. When propane leaks, where does it tend to accumulate?
