Question 1

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?

Accepted Answer

The answer of Technician A says that dedicated vehicles are...

Question 2

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

Accepted Answer

Ethanol is commonly added to gasoline to increase its octane rating, which improves engine performance and reduces knocking.

Question 3

While discussing common rail fuel injection systems: Technician A says the individual injectors are activated by the high pressure present in the fuel rail. Technician B says some late-model CR systems have an intensifier in the injector that allows for an increase in fuel pressure. Who is correct?

Accepted Answer

Both technicians are correct. Individual injectors in a common rail fuel injection system are indeed activated by the high pressure present in the fuel rail. Some late-model CR systems also have an intensifier in the injector that allows for an increase in fuel pressure, which Technician B correctly states.

Question 4

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

Accepted Answer

The answer of The most common method of measuring fuel...

Question 5

Technician A says piezo material is a type of crystal that rapidly shrinks when it is exposed to electrical current. Technician B says piezo material shrinks very slowly when current to it is stopped. Who is correct?

Accepted Answer

The answer of Technician A says piezo material is a...

Question 6

LP-gas is commonly called ____________________.

Accepted Answer

The answer of LP-gas is commonly called ____________________....

Question 7

Crude oil is commonly referred to as a ___________________ fuel because it is naturally produced by the decaying of plants and animals that lived a long time ago and were covered by dirt for many years.

Accepted Answer

The answer of Crude oil is commonly referred to as...

Question 8

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

Accepted Answer

The answer of When the sulfur in fuel is burned,...

Question 9

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

Accepted Answer

Technician A is correct. Reformulated gasoline reduces emissions by increasing the oxygen content in the fuel, resulting in a leaner air-fuel mixture.

Technician B is incorrect. Reformulated gasoline actually produces less carbon dioxide than conventional gasoline due to its lower sulfur content and improved combustion efficiency.

Question 10

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?

Accepted Answer

A cylinder misfire in a warm engine can cause incomplete combustion and result in white smoke in the exhaust of a diesel engine. This is because the unburned fuel is released as white smoke. Blue smoke in the exhaust of a diesel engine can be caused by many issues, including scored cylinder walls. When the walls of the cylinders have been scored, oil can enter the combustion chamber, which results in blue smoke. Therefore, both Technician A and B are correct.

Question 11

____________________ is the lightest and simplest of alcohols.

Accepted Answer

The answer of ____________________ is the lightest and simplest of...

Question 12

High octane fuel burns ____________________ than low octane fuel.

Accepted Answer

The answer of High octane fuel burns ____________________ than low...

Question 13

Technician A says that the use of methanol in internal combustion engines has declined over the years. Technician B says that the use of MTBE as a gasoline additive has declined over the years. Who is correct?

Accepted Answer

Both technicians are correct. Methanol has declined in use due to its corrosive properties and potential to damage rubber components in fuel systems. MTBE has also declined in use due to environmental concerns about its potential to contaminate groundwater.

Question 14

While diagnosing a diesel engine driveability problem: Technician A says that while the scan tool data is similar to that available for a gasoline engine, all diesel engine troubleshooting procedures are unique. Technician B says a cylinder power balance check can be made by checking the resistance of the engine's glow plugs. Who is correct?

Accepted Answer

The answer of While diagnosing a diesel engine driveability problem:...

Question 15

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?

Accepted Answer

Diesel engines do consume less fuel per mile than gasoline engines of the same size, making Technician A correct. Additionally, diesel engines provide more torque than gasoline engines of the same size, making Technician B correct as well.

Question 16

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?

Accepted Answer

Technician A is correct because E85, which is a blend of 85% ethanol and 15% gasoline, is primarily produced from domestically grown corn in the United States, thus reducing reliance on foreign oil. Technician B is incorrect because while E85 may have environmental benefits, it actually increases fuel consumption due to ethanol's lower energy content compared to gasoline, meaning more of it is required to produce the same energy output.

Question 17

The ___________________ number is a measure of the antiknock [detonation-resistance] quality of a gasoline.

Accepted Answer

The answer of The ___________________ number is a measure of...

Question 18

While discussing chemicals that are currently added to refined gasoline in order to boost its octane: Technician A says methylcyclopentienyl manganese tricarbonyl (MMT) is normally added to gasoline. Technician B says ethanol can be added to boost the octane rating of gasoline. Who is correct?

Accepted Answer

MMT and ethanol are both used as octane boosters in gasoline. MMT is a metallic additive, while ethanol is an alcohol that increases the octane rating when blended with gasoline.

Question 19

Which of the following statements about hydrogen is NOT true?

Accepted Answer

It actually costs more to produce hydrogen than gasoline due to the energy required to extract it from other sources such as natural gas, water, or biomass.

Question 20

Which of the following is NOT an advantage of biodiesel fuel?

Accepted Answer

Biodiesel is generally more expensive to produce than petroleum-based oil due to the costs associated with raw materials and production processes.

Quiz 28: Gasoline, Diesel, and Other Fuels