Question 1

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

Accepted Answer

The answer of While discussing chemicals that are currently added...

Question 2

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 3

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 4

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

Technician A is incorrect because while diesel engines have unique components, many diagnostic procedures are similar to gasoline engines. Technician B is incorrect because a cylinder power balance check is not performed by checking glow plug resistance; it involves measuring the contribution of each cylinder to the engine's power output.

Question 5

High octane fuel burns ____________________ than low octane fuel.

Accepted Answer

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

Question 6

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 7

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

Accepted Answer

The answer of The process of splitting methane into hydrogen...

Question 8

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

White smoke in the exhaust of a diesel engine can indicate incomplete combustion, which can occur with a cylinder misfire. Blue smoke suggests oil burning in the combustion chamber, which can happen with scored cylinder walls or worn valve seals, making both Technician A and B correct.

Question 9

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

Technician A is correct because in common rail fuel injection systems, the injectors are indeed activated by the high pressure present in the fuel rail. Technician B is also correct because some late-model common rail (CR) systems incorporate an intensifier piston within the injector to further increase the fuel pressure before injection, allowing for finer atomization and better control over injection timing and quantity.

Question 10

Which of the following statements about hydrogen is NOT true?

Accepted Answer

Producing hydrogen, especially through methods like electrolysis or from fossil fuels with carbon capture, is currently more expensive than producing gasoline. This is due to the energy required for its production, the cost of electricity, and the infrastructure needed for its capture and storage.

Question 11

Crude oil is referred to as a(n) ___________________ fuel because it is produced by the decaying of plants and animals that lived a long time ago.

Accepted Answer

The answer of Crude oil is referred to as a(n) ___________________...

Question 12

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 13

____________________ is the lightest and simplest of alcohols.

Accepted Answer

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

Question 14

LP-gas is commonly called ____________________.

Accepted Answer

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

Question 15

Alcohol weighs _______________ than  gasoline.

Accepted Answer

The answer of Alcohol weighs _______________ than  gasoline....

Question 16

Ethanol has an octane rating of ___________________.

Accepted Answer

The answer of Ethanol has an octane rating of ___________________....

Question 17

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 18

A diesel fuel's ignition quality is measured by a ___________________ rating.

Accepted Answer

The answer of A diesel fuel's ignition quality is measured...

Question 19

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

The answer of Technician A says that reformulated gasoline produces...

Question 20

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 statements are correct. The use of methanol in internal combustion engines has seen a decline due to various factors including availability, energy density, and material compatibility issues. Similarly, the use of MTBE (Methyl Tertiary Butyl Ether) as a gasoline additive has significantly declined due to environmental concerns, particularly its potential to contaminate groundwater.

Quiz 28: Gasoline, Diesel and Other Fuels

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