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WorksheetsNatural Gas For Vehicle System
Total questions: 15
Worksheet time: 11mins
What is the CNG stands for?
Compressed Natural Gas
Compression and Gas
Combustible Natural Gas
Coloured Natural Gas
Which gas is present in CNG?
Oxygen
Carbon Monoxide
Methane
Butane
What is the difference LPG and CNG?
CNG mainly methane compressed while LPG is a mixture of propane liquefied.
CNG mainly hydrogen compressed while LPG is a mixture of propane and butane liquefied.
CNG mainly methane compressed while LPG is a mixture of propane and butane liquefied.
CNG mainly oxygen compressed while LPG is a mixture of propane and butane liquefied.
What is the maximum pressure for a NGV tank can withstand?
200 Bar or 20000 kpa.
210 Bar or 21000 kpa
180 Bar or 18000 kpa.
150 Bar or 15000 kpa
Describe the different between first and second generation for NGV system.
Gas delivery differences which first generation is using mixer while second generation is using carburettor.
Method of metering natural gas from tank is different.
First generation is combining with carburettor fuel system while second generation is combining with electronic fuel injection.
Gas delivery differences which first generation is using mixer while second generation is using gas injector.
Why the NGV pressure regulators become freezing while in operation?
Due to gas pressure decrease can cause the temperature drop.
Due to gas pressure stabilize can cause the temperature drop.
Due to gas flow increase can cause the temperature drop.
Due to gas pressure increase can cause the temperature drop.
Define the NGV ignition emulator function in second generation system.
Function to lower gas flow injection.
Emulator will advance the ignition timing during NGV operation.
Function to high gas flow injection.
Controlling the gas pressure.
Which one of the following correctly describes the gas flow of a compress natural gas engine?
Tank - lines - regulator - mixer.
Tank - regulator - lines - mixer.
Tank - valve - lines - mixer.
Tank - regulator - lines - valve.
What is the purpose of natural gas for vehicle (NGV) engine regulator?
Proportioning NGV gas from tank.
Metering NGV gas from tank.
Regulate NGV gas pressure from tank.
Residual NGV gas from tank.
Using a diagnostic strategy for a drivability concern, which of the following is generally the last step in that process to identify compress natural gas vehicle problems?
Checking vehicle history.
Verifying repair.
Doing service checks.
Verifying concern.
What is the Natural gas vehicle (NGVs) offer numerous advantages?
Contributing to lower emissions.
High maintenance cost.
Contributing to high emissions.
Price of compressed natural gas (CNG).
What is the purpose of compress natural gas engine mixer?
To allow gas flow entering the intake.
To control gas flow before entering intake.
To blends air and gas before entering intake.
To allow gas flow entering the exhaust.
What is the purpose of shut off valve at compress natural gas cylinder?
To cut air entering intake.
To cut gasoline entering intake.
To cut gas flow from tank to lines.
To cut gas flow from lines to regulator.
How to identify vehicle equipped with compress natural gas system?
Check the engine compartment.
Marked by NGV sign.
Identify natural gas tank.
Check the vehicle manual book.
Some of compress natural gas tank was laminated with the composite. What is the purpose of composite laminated?
To increase tank strength.
To increase tank volume.
To increase tank capacity.
To increase tank pressure.
