CNG Emergency Procedures and Response 2

Question 1

What is the flammability range of natural gas in air?

Accepted Answer

5–15% by volume

Answer

1–4% by volume

Answer

20–30% by volume

Answer

35–50% by volume

Question 2

When a CNG leak is detected inside a vehicle, what is the FIRST action the driver should take?

Accepted Answer

Shut off the engine and exit the vehicle

Answer

Call 911 immediately from inside the vehicle

Answer

Open all windows to ventilate the cabin

Answer

Drive to the nearest service station

Question 3

In an enclosed building, released CNG will tend to accumulate:

Accepted Answer

Near the ceiling

Answer

Near floor level

Answer

At mid-height

Answer

Uniformly throughout the space

Question 4

The odorant added to natural gas to assist in leak detection smells like:

Accepted Answer

Rotten eggs or sulfur

Answer

Ammonia

Answer

Bleach

Answer

Gasoline

Question 5

Compared to a gasoline spill, an outdoor CNG release is generally safer because:

Accepted Answer

CNG disperses upward rather than pooling on the ground

Answer

CNG burns at a lower temperature

Answer

CNG is non-toxic at all concentrations

Answer

CNG requires a higher ignition energy

Question 6

Which fire extinguisher class is appropriate for a natural gas (CNG) fire?

Accepted Answer

Class B

Answer

Class A

Answer

Class C

Answer

Class K

Question 7

Upon detecting a natural gas odor inside a building, you should:

Accepted Answer

Evacuate immediately without operating any electrical switches

Answer

Turn on ventilation fans to disperse the gas

Answer

Flip a light switch to illuminate the area

Answer

Check the gas meter reading before leaving