CNG CNG Fleet Management and Driver Operations 2

Question 1

A fleet manager scheduling preventive maintenance for CNG vehicles should ensure cylinders are re-inspected at which interval per NFPA 52?

Accepted Answer

Every 3 years or per the cylinder manufacturer's specification, whichever comes first

Answer

NFPA 52 requires periodic cylinder re-inspection at intervals specified by the manufacturer, typically every 3 years, to ensure continued safe service.

Question 2

When a CNG fleet vehicle is involved in a collision, what is the fleet manager's first safety priority regarding the fuel system?

Accepted Answer

Close the manual shutoff valve and keep ignition sources away from the vehicle

Answer

After a collision, the manual shutoff valve should be closed immediately to isolate the fuel supply and prevent gas release near potential ignition sources.

Question 3

Which training requirement is mandated for employees who fuel CNG vehicles at a fleet's private fueling station under OSHA standards?

Accepted Answer

Hazard Communication (HazCom) training on compressed gas hazards and emergency procedures

Answer

OSHA's Hazard Communication Standard requires employees working with compressed gases, including CNG, to receive training on associated hazards and safe handling procedures.

Question 4

A fleet data system shows a CNG vehicle's average fuel consumption increased by 15% with no change in route. What is the most likely cause to investigate?

Accepted Answer

A fuel system leak causing unaccounted gas loss

Answer

An unexpected increase in fuel consumption without route changes may indicate a slow leak in the CNG system that is wasting fuel.

Question 5

For a fleet operating CNG vehicles in cold climates, which operational challenge must managers plan for during winter months?

Accepted Answer

Reduced fueling efficiency due to temperature-related pressure variations affecting fill levels

Answer

Cold ambient temperatures affect gas density and pressure during fueling, which can reduce the amount of CNG that can be dispensed into cylinders without a slow-fill process.

(CNG) Compressed Natural Gas Practice Test

(CNG) Compressed Natural Gas Practice Test

CNG CNG Fleet Management and Driver Operations 2