Deck 39: Petroleum Fuels and Alternative Fuel Technologies

Question 1

Although biodiesel is cleaner burning than petroleum diesel, pure biodiesel (B100) requires fuel system modifications on pre-1994 diesel engines.

Answer 1

True

Question 2

The term MOST-Likely used to describe an ideal fuel, that produces no emissions other than water and carbon dioxide is:

A)liquefied natural gas
B)hydrogen
C)liquefied petroleum gas
D)compressed natural gas

Answer 2

B

Question 3

The term MOST-Likely used to describe the event where air-fuel mixture self-ignites due to increased pressure in the cylinder is:

A)noise
B)preignition
C)detonation
D)dieseling

Answer 3

C

Question 4

Water is an enemy to diesels and must not be allowed to accumulate in the fuel system.

Question 5

Which of the following statements is LEAST-Likely true?

A)A major disadvantage to alcohol fuels when compared to gasoline is that they are invisible when burning.
B)Methanol is very corrosive and is poisonous.
C)LPG is mostly butane.
D)Methanol attacks aluminum, some plastics, and other materials.

Question 6

Diesel fuels contain some paraffin (wax). In very cold weather, the paraffin can separate from the fuel. This is called the ____________________.

Question 7

____________________ is a measure of how easy a fuel evaporates.

Question 8

When the air-fuel mixture is ignited during normal combustion, a ____ travels across the combustion chamber and pushes the piston down in the cylinder.

A)surge
B)flame front
C)spark
D)run-on

Question 9

When a gasoline engine continues to run even after the ignition key is turned off, this is called ____________________.

Question 10

A car's ____________________ on the highway is a symptom of a lean condition.

Question 11

Gasoline can be refined so it will not knock as easily. This fuel has a high ____ value.

A)dieseling
B)LPG
C)ethanol
D)octane

Question 12

The ____________________ of a diesel fuel describes how easily the fuel will ignite.

Question 13

While having a discussion, Technician A says that carbonaceous deposits are caused when oil and heat come together. Technician B says that carbonaceous deposits are from fuel. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 14

Unlike preignition, detonation does not produce a knocking sound, so the impending damage is not apparent until it is too late.

Question 15

While having a discussion, Technician A says that the noise from spark knock is caused by the vibration of the combustion chamber walls. Technician B says that it is caused by low volatility. Who is correct?

A)A only
B)B only
C)Both A and B
D)Neither A nor B

Question 16

Crude oil is a variable combination of large and small hydrocarbons together with petroleum gas, hydrogen sulfide, and water.

Question 17

Which of the following statements is LEAST Likely true?

A)More frequent oil changes are required with diesels.
B)Under a heavy load, a diesel makes soot, which is abrasive and is hard on engine parts.
C)While heavy trucks have transmissions with many gears and are designed to pull heavy loads, passenger cars have only the normal number of gear ranges.
D)Diesels generally have a smaller capacity oil pan.

Question 18

With gasoline octane ratings, the lower the octane number, the more resistant the fuel is to knocking.

Question 19

All of the following statements are true EXCEPT:

A)diesel engines burn diesel oil as fuel.
B)a diesel has a very low-compression ratio.
C)diesel fuel is light oil that is refined as part of the same process that makes gasoline.
D)a diesel engine is called a compression ignition engine.

Question 20

All of the following statements are true EXCEPT:

A)LPG tends to settle out as a liquid in the intake manifold.
B)LPG has a higher octane; therefore, it can be used in engines with higher compression ratios.
C)less frequent oil change intervals are required because LPG is a dry gas so it does not create carbon in the combustion chamber.
D)LPG burns cleanly, produces fewer emissions, and lacks the objectionable exhaust odor of incompletely burned gasoline.

Question 21

What are the disadvantages of LPG?

Question 22

What are some of the possible causes of preignition?

Question 23

What is the difference between the following two grades for automotive diesel fuel: Grade number 1-D and Grade number 2-D?

Question 24

What are some of the problems that can occur as a result of vapor lock?

Question 25

What are the results of low volatility?