Exam 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?

LP-gas delivers more power than gasoline.

An LP [propane]-powered vehicle stores its fuel in pressurized tanks at approximately ______ psi.

How can you identify a flex-fuel vehicle?

Technician A says large, low-speed industrial diesels require a high-quality and highly volatile fuel because they cannot tolerate excessive carbon deposits that result from low-volatile fuels. Technician B says the small, high-speed diesel engines found in passenger cars are relatively unaffected by carbon deposits and can run on low-quality fuel. Who is correct?

____________________ is the lightest and simplest of alcohols.

Why is leaded gasoline no longer available as an automotive fuel?

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?

Technician A says an 87 octane fuel is a blend of 87 percent octane and 13 percent ethanol. Technician B says an 87 octane fuel will experience detonation in a test engine at the same temperatures and pressures as a sample fuel blend of 87 percent isooctane and 13 percent heptane. Who is correct?

Alcohol weighs _______________ than  gasoline.

How does nitrous oxide improve engine performance?

What is the effect(s)of adding alcohol to gasoline?

Most diesel fuel currently available at the pump has a cetane rating of ______.

Methanol can be made from ______.

Technician A says a lean mixture burns faster than a rich mixture. Technician B says advanced ignition timing induces knock. Who is correct?

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?

Ethanol has an octane rating of ___________________.

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

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.