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Exam 28: Gasoline, Diesel, and Other Fuels

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Question 31

Multiple Choice

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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?

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

E) A) and B)
F) A) and C)

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Question 32

Multiple Choice

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How can you identify a flex-fuel vehicle?

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

E) None of the above
F) A) and D)

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Question 33

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

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

What is the difference between E85 fuel and M85 fuel?

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?

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.

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.

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

Using gasoline with high levels of sulfur can cause ______.

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

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.

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?

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?

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.

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?

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

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?

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