Exam 28: Gasoline, Diesel, and Other Fuels

Diesel engines are being discussed. Technician A says diesel fuel contains less energy than gasoline. Technician B says diesel engines produce more torque than gasoline engines. Who is correct?

Piezoelectric materials can emit a small amount of voltage when they are struck, squeezed, or exposed to vibration.

A hybrid vehicle may have battery voltages over 200 volts.

All the following statements are correct EXCEPT:

Technician A says an 87 octane fuel is a blend of 87 percent octane and 13 percent ethanol. Technician B says an 87 octane fuel will experience detonation in a test engine at the same temperatures and pressures as a sample fuel blend of 87 percent isooctane and 13 percent heptane. Who is correct?

What is a plug-in hybrid?

Technician A says Number 1 diesel fuel is the most popular and widely distributed. Technician B says Number 1 diesel fuel is blended with Number 2 to improve starting in cold weather. 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?

How does nitrous oxide improve engine performance?

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?

Technician A says that reformulated gasoline produces a leaner air-fuel mixture. Technician B says that RFG generates more carbon dioxide. Who is correct?

All the following are emission-related characteristics of diesel fuel EXCEPT:

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

Which of the following is an effect of adding alcohol to gasoline?

Define the term "volatility."

An LP [propane]-powered vehicle stores its fuel in pressurized tanks at approximately ______ psi.

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

Which of the following is NOT a major factor affecting fuel performance?

The process of splitting methane into hydrogen and carbon is called ___________________.

High octane fuel burns ____________________ than low octane fuel.