Exam 28: Gasoline, Diesel and Other Fuels

Which of the following statements about hydrogen is NOT true?

An engine is being diagnosed for a lean running condition. Technician A checks for air leaks in the intake. Technician B checks for alcohol in the fuel. Who is correct?

When the sulfur in fuel is burned, it combines with oxygen to form ____________________.

Compressed natural gas (CNG)is the cleanest alternative fuel.

What chemical is added seasonally to gasoline as an anti-icing agent to prevent fuel line freeze-up in cold weather?

Technician A says the biggest disadvantage of using CNG as a fuel is that the large amount space occupied by fuel cylinders limits the driving range of the vehicle. Technician B says bi-fuel vehicles are equipped to store both CNG and gasoline and will run on either.Who is correct?

Excessive alcohol in the fuel may cause ______.

Any vehicle that combines two or more sources of power is called a ___________________.

Technician A says a motor converts electrical energy into mechanical energy. Technician B says an engine converts chemical energy into mechanical energy. Who is correct?

Technician A says diesel engines consume less fuel per mile than a gasoline engine of the same size. Technician B says diesel engines provide more torque than a gasoline engine of the same size. Who is correct?

The octane number is a measure of a fuel's ability to produce power.

High octane fuel burns ____________________ than low octane fuel.

Technician A says increasing the Reid vapor pressure (RVP)will help the engine start easier in cold weather. Technician B s ays increasing the RVP will increase the possibility of fuel boiling (vapor lock)in summer driving. Who is correct?

Because diesel engines burn less fuel, they also emit less CO₂.

All of the following are aromatic hydrocarbons EXCEPT:

Technician A says white smoke in the exhaust of a diesel engine can be the result of a cylinder misfire in a warm engine. Technician B says blue smoke in the exhaust of a diesel engine can be caused by scored cylinder walls. Who is correct?

The octane rating has nothing to do with fuel economy or engine efficiency.

What are the two ways natural gas is used to fuel an automobile?

Gasoline volatility is being discussed. Technician A says gasoline blended for summer use is more volatile than winter gasoline. Technician B says in high altitude areas, fuels must be blended to have higher volatility.

Biomass fuels are those derived from nonfossil sources and produced from plant or animal products or wastes.