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CNG Exam Questions And Accurate Answers
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CNG Exam Questions And AccurateAnswers
How often does a CNG cylinder inspection need to be done - Answer CNG cylinder
inspections are required every three years, or 36,000 miles, or after any fire or accident
What is the major constituent in natural gas? - Answer Methane
Which fuel has the lowest carbon content? - Answer Natural gas
What is the chemical composition of methane? - Answer CH4
Natural gas is - Answer lighter than air.
Natural gas has which of the following characteristics? - Answer Odorless
What is the ignition temperature of natural gas? - Answer 900 degrees to 1080 degrees
Fahrenheit
For natural gas, the lower the flammability limit is ____% and the upper flammability limit
is ___%. - Answer 5, 15
What are the human health hazards that must be considered when working on CNG
vehicle? - Answer High pressure, fire, and Asphyxiation
What is the maximum fill pressure of a 3,600 PSI cylinder? - Answer 4,500 psi
What is the minimum burst pressure of a high pressure fuel line? - Answer 20,000 PSI
What is the minimum burst pressure of a 3600 PSI CNG cylinder? - Answer 8100 PSI
These are true statements about compressed natural gas - Answer as temperature
decreases, pressure decreases. As temperature increases, pressure increases.
The rated service pressure of CNG cylinders is measured at what temperature? -
Answer 70 degrees Fahrenheit
What standards address CNG cylinder design in manufacturing? - Answer ANSI NGV 2
and FM VSS304
The primary installation code for CNG cylinders and fuel system components is - Answer
NFPA 52
Why is NFPA 52 important? - Answer It is helpful to the CNG fuel system inspector in
identifying unsafe installation practices.
When inspecting CNG cylinders, the primary inspection guidance document is - Answer
cylinder manufacturers guidelines the second is CGA C 6.4
, NGV2 #1 - Answer all metal cylinder made of steel or aluminum
NVG2 #2 - Answer A cylinder made of steel or aluminum with a hoop wrapped overwrap
NVG2 #3 - Answer A cylinder made of thin steel or aluminum liner with a Foley wound
overwrap
NVG2 #4 - Answer A cylinder with a plastic liner in a Foley wound overwrap
Primary causes of CNG cylinder failure - Answer undetected external damage causes
ruptures most often during fueling.
The CNG fuel receptacle - Answer Allow CNG to flow into the vehicle, is equipped with a
one way check valve, should always have an o ring in a dust cover in good working
order.
Which CNG fuel system component prevents gas from flowing to the engine when the
key is on, but the engine is not running? - Answer Fuel shutoff solenoid valve.
Type 3 CNG cylinders are made of - Answer metal liner in a fiber an resin composite
outer wrap.
Type 4 CNG cylinders are made of - Answer non metallic liner in a fiber and a resident
composite material
The most significant safety hazard with CNG cylinders is - Answer rupture during fueling
due to undetected damage.
The CNG fuel receptacle contains a check valve design to - Answer prevent CNG fuel
from flowing back out of the receptacle.
The o ring inside the fuel receptacle provides - Answer a seal between the nozzle and
the receptacle
The secondary check valve is - Answer installed to prevent CNG from flowing back to
the receptacle.
The defueling system - Answer is required by NFPA 52 , should only be used by properly
trained personnel, should be leak checked during the fuel system inspection.
How often does a CNG cylinder inspection need to be done - Answer CNG cylinder
inspections are required every three years, or 36,000 miles, or after any fire or accident
What is the major constituent in natural gas? - Answer Methane
Which fuel has the lowest carbon content? - Answer Natural gas
What is the chemical composition of methane? - Answer CH4
Natural gas is - Answer lighter than air.
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