Exam 28: Gasoline, Diesel and Other Fuels

Technician A says there is less heat energy in high-octane gasoline and, therefore, less power is generated during combustion. Technician B says using a higher-octane gasoline than required will not produce more power unless the engine has a knock sensor that allows the system to adjust ignition timing to take advantage of the higher octane. Who is correct?

The most common method of measuring fuel volatility is the ____________________ pressure test.

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

LNG (liquefied natural gas)is not a practical fuel for personal use and is only used in heavy-duty applications.

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

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?

Using gasoline with high levels of sulfur can cause ______.

Pump gasoline may safely contain up to 10 percent alcohol.

While discussing the reasons why the use of E 85 gasoline is good for consumers: Technician A says it is produced in the United States and can reduce our reliance on foreign oil. Technician B says an engine's fuel consumption is greatly reduced. Who is correct?

LP-gas is commonly called ____________________.

Define the term "volatility."

Oxygenated fuels tend to have higher CO emissions.

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

Which of the following chemicals is commonly added to gasoline to increase its octane rating?

Technician A says that dedicated vehicles are those designed to use one particular type of fuel. Technician B says that bi-fuel vehicles can operate solely on an alcohol-based fuel or unleaded gasoline, or a mixture of the two, which gives the driver flexibility and convenience when refilling the fuel tank Who is correct?

The ideal air/fuel or stoichiometric ratio for a gasoline engine is approximately _____ pounds of air mixed with 1 pound of gasoline.

In the past the limit for sulfur content in diesel fuel was 500 ppm [parts per million]. The current standard for low sulfur diesel fuel allows a maximum of _____ of sulfur in the fuel.

Which of the following is considered natural gas?

Octane ratings are being discussed. Technician A says most modern engines are designed to use regular grade gasoline. Technician B says to use high octane gasoline only when an engine was designed to use it. Who is correct?

Which statement concerning E85 automotive fuel is false?