Question 1

How can you identify a flex-fuel vehicle?

Accepted Answer

A)  The fourth digit of the VIN is the letter F 
B)  The clover leaf symbol on the exterior or interior of the vehicle 
C)  The filler neck for the gas tank is 15mm larger 
D)  The letters FF after the model designation on the rear body panel

Question 2

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 3

If a flex fuel vehicle has half a tank of E85 onboard and the driver then fills the tank up with regular gasoline what will happen?

Accepted Answer

A)  There may be detonation [spark knock] on acceleration 
B)  The system will run rich 
C)  The system will run lean 
D)  The system will automatically adjust and run normally

Question 4

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

Accepted Answer

A) True 
 B)False

Question 5

Using gasoline with high levels of sulfur can cause ______.

Accepted Answer

A)  damage to engine bearings 
B)  exhaust valve pitting 
C)  rotten egg smell from the exhaust 
D)  all answers are correct

Question 6

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

A)  A only 
B)  B only 
C)  both A and B 
D)  neither A nor B

Question 7

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 8

Crude oil is separated into its basic chemical compounds by_____. In this process, the crude oil is heated to about 1,200°F and vaporized. Different chemical compounds condense at different temperatures as the vapor passes through a cooling tower.

Accepted Answer

A)  osmotic reaction 
B)  fractional distillation 
C)  catalytic reduction 
D)  all answers are correct

Question 9

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

Accepted Answer

A)  Isooctane 
B)  Heptane 
C)  Sulfur 
D)  Ethanol

Question 10

Animal fats, recycled restaurant grease, and vegetable oils derived from crops such as soybeans, canola, corn, and sunflowers are used in the production of ___________________fuel.

Accepted Answer

The answer of Animal fats, recycled restaurant grease, and vegetable...

Question 11

Hydrogen-fueled vehicles are being discussed. Technician A says hydrogen [H2] can be made from natural gas. Technician B says hydrogen can be made from water. Who is correct?

Accepted Answer

A)  A only 
B)  B only 
C)  both A and B 
D)  neither A nor B

Question 12

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 13

The most widely used gasoline oxygenate additive is ethanol (ethyl alcohol), or grain alcohol.

Accepted Answer

A) True 
 B)False

Question 14

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.

Accepted Answer

A)  A only 
B)  B only 
C)  both A and B 
D)  neither A nor B

Question 15

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?

Accepted Answer

A)  A only 
B)  B only 
C)  both A and B 
D)  neither A nor B

Question 16

Ethanol decreases CO emissions due to the higher oxygen content of the fuel.

Accepted Answer

A) True 
 B)False

Question 17

All of the following are aromatic hydrocarbons EXCEPT:

Accepted Answer

A)  benzene 
B)  xylene 
C)  kerosene 
D)  toluene

Question 18

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?

Accepted Answer

A)  A only 
B)  B only 
C)  both A and B 
D)  neither A nor B

Question 19

What is the difference between E85 fuel and M85 fuel?

Accepted Answer

The answer of What is the difference between E85 fuel...

Question 20

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?

Accepted Answer

A)  A only 
B)  B only 
C)  both A and B 
D)  neither A nor B

Exam 28: Gasoline, Diesel, and Other Fuels

How can you identify a flex-fuel vehicle?

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

If a flex fuel vehicle has half a tank of E85 onboard and the driver then fills the tank up with regular gasoline what will happen?

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

Using gasoline with high levels of sulfur can cause ______.

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?

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

Crude oil is separated into its basic chemical compounds by_____. In this process, the crude oil is heated to about 1,200°F and vaporized. Different chemical compounds condense at different temperatures as the vapor passes through a cooling tower.

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

Animal fats, recycled restaurant grease, and vegetable oils derived from crops such as soybeans, canola, corn, and sunflowers are used in the production of ___________________fuel.

Hydrogen-fueled vehicles are being discussed. Technician A says hydrogen [H₂] can be made from natural gas. Technician B says hydrogen can be made from water. Who is correct?

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.

The most widely used gasoline oxygenate additive is ethanol (ethyl alcohol), or grain alcohol.

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.

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?

Ethanol decreases CO emissions due to the higher oxygen content of the fuel.

All of the following are aromatic hydrocarbons EXCEPT:

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?

What is the difference between E85 fuel and M85 fuel?

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?