Question 1

Which of the following is the best factor to use when determining whether a fuel filter should be replaced?

Accepted Answer

A) Time in service. 
B) Distance traveled. 
C) Operating conditions. 
D) Restriction measurement. 
A) Time in service. 
B) Distance traveled. 
C) Operating conditions. 
D) Restriction measurement.

Question 2

Which of the following methods is best suited to treating diesel fuel that contains free water while minimizing any potential damage to the fuel system?

Accepted Answer

A) Add alcohol to keep the water dissolved and to prevent freezing. 
B) Heat the fuel with a fuel heater to prevent icing. 
C) Separate the water from the fuel through coalescence. 
D) Treat the fuel with kerosene. 
A) Add alcohol to keep the water dissolved and to prevent freezing. 
B) Heat the fuel with a fuel heater to prevent icing. 
C) Separate the water from the fuel through coalescence. 
D) Treat the fuel with kerosene.

Question 3

What effect does gasoline contamination have on diesel fuel?

Accepted Answer

A) It lowers the auto-ignition temperature of the fuel. 
B) It lowers the flash point of the fuel. 
C) It lowers the cloud point of the fuel. 
D) It shortens the ignition delay time of the fuel. 
A) It lowers the auto-ignition temperature of the fuel. 
B) It lowers the flash point of the fuel. 
C) It lowers the cloud point of the fuel. 
D) It shortens the ignition delay time of the fuel.

Question 4

Which of the following concerns will NOT be caused by air in fuel?

Accepted Answer

A) Low-power" 
B) Engine will run rough" 
C) Hard to start 
D) Poor fuel economy" 
A) Low-power" 
B) Engine will run rough" 
C) Hard to start 
D) Poor fuel economy"

Question 5

Which of the following CN booster compounds can increase the CN of the fuels by as much as seven points in small concentrations (0.2%)?

Accepted Answer

A) Octane based" 
B) Nitrate based" 
C) Hydrogen based 
D) Oxygen based" 
A) Octane based" 
B) Nitrate based" 
C) Hydrogen based 
D) Oxygen based"

Question 6

Technician A says that placing a fuel heater in a filter housing is the best way to prevent wax and ice crystals from restricting fuel flow. Technician B says that ethanol can be used to dissolve wax and prevent water from crystalizing in fuel filters. Who is correct?

Accepted Answer

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

Question 7

Which of the following can cause can cause abrasive wear and fuel filter plugging?

Accepted Answer

A) High sulfur" 
B) Aromatics" 
C) Ashphaltenes 
D) Naphthalenes" 
A) High sulfur" 
B) Aromatics" 
C) Ashphaltenes 
D) Naphthalenes"

Question 8

In the US, diesel fuel properties are regulated by the Environmental Protection Agency (EPA) and:

Accepted Answer

A) ASTM (American Society for Testing Materials)" 
B) SAE (Society of Automotive Engineers)" 
C) ATA (American Trucking Association) 
D) TMC (Truck Maintenance Council)" 
A) ASTM (American Society for Testing Materials)" 
B) SAE (Society of Automotive Engineers)" 
C) ATA (American Trucking Association) 
D) TMC (Truck Maintenance Council)"

Question 9

You are measuring secondary filter output pressure. Technician A says that air can lead to the injector tips of newer high-pressure nozzles being damaged. Technician B says that you connect the gauge to the outlet side of the secondary filter. Who is right?

Accepted Answer

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

Question 10

Technician A says that primary filters typically use chemically treated paper filter media with a micron rating of more than 10 microns. Technician B says that synthetic filter media is used to separate bound, or coalesced, water from fuel inside a primary filter. Who is correct?

Accepted Answer

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

Question 11

Technician A says that coolant is used to heat fuel in fuel-water separators. Technician B says that electrical heating elements keep water and wax from plugging the filter in a fuel-water separator. Who is correct?

Accepted Answer

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

Question 12

Technician A says that diesel fuel's low volatility is why so many diesel fuel pump islands appear to have a lot of spilled fuel. Technician B says that fuel spills at diesel pump islands are more common than those at gasoline pumps because truck drivers are careless when refueling. Who is correct?

Accepted Answer

A) Technician A" 
B) Technician B" 
C) Both A and B 
D) Neither A nor B" 
A) Technician A" 
B) Technician B" 
C) Both A and B 
D) Neither A nor B"

Question 13

Technician A says that diesel fuel's low volatility is why so many diesel fuel pump islands appear to have a lot of spilled fuel. Technician B says that fuel spills at diesel pump islands are more common than those at gasoline pumps because truck drivers are careless when refueling. Who is correct?

Accepted Answer

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

Question 14

Technician A says that adding alcohol to diesel fuel is a good practice because it keeps fuel from waxing when it is cold and it improves engine starting. Technician B says wax in fuel should be removed at the refinery because it causes owners to make complaints about low power in hot weather. Who is correct?

Accepted Answer

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

Question 15

The temperature at which wax crystals begin to form in diesel fuel is referred to as its _______.

Accepted Answer

A) cloud point 
B) pour point 
C) CN 
D) viscosity index 
A) cloud point 
B) pour point 
C) CN 
D) viscosity index

Question 16

Technician A says that the primary filter helps extend the life of the secondary filter. Technician B says that the primary filter is located between the engine's high-pressure injection system and the secondary filter. Who is correct?

Accepted Answer

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

Question 17

Which color is fresh, good-quality 2-D diesel fuel when it is commercially retailed?

Accepted Answer

A) Red. 
B) Clear. 
C) Blue. 
D) Dark green. 
A) Red. 
B) Clear. 
C) Blue. 
D) Dark green.

Question 18

Which of the following is the result of water contaminating fuel?

Accepted Answer

A) Lower fuel density." 
B) Fuel system components rusting or corroding." 
C) Cleaner injector nozzles. 
D) Cooler injector operation." 
A) Lower fuel density." 
B) Fuel system components rusting or corroding." 
C) Cleaner injector nozzles. 
D) Cooler injector operation."

Question 19

The EPA began to limit the sulfur content of on-road diesel fuel in 1993 to 0.05% mass or 500 ppm maximum, which mandated the production of:

Accepted Answer

A) low-sulfur diesel (LS
D)  fuel" 
B) sulfur free diesel fuel" 
C) biodiesel 
D) ultra-low-sulfur diesel (ULS
D) " 
A) low-sulfur diesel (LS
D)  fuel" 
B) sulfur free diesel fuel" 
C) biodiesel 
D) ultra-low-sulfur diesel (ULS
D) "

Question 20

What material is not suitable for diesel fuel tanks in mobile applications?

Accepted Answer

A) Aluminum" 
B) Plastic" 
C) Steel alloy 
D) Fiberglass" 
A) Aluminum" 
B) Plastic" 
C) Steel alloy 
D) Fiberglass"

Which of the following is the best factor to use when determining whether a fuel filter should be replaced?

Which of the following methods is best suited to treating diesel fuel that contains free water while minimizing any potential damage to the fuel system?

What effect does gasoline contamination have on diesel fuel?

Which of the following concerns will NOT be caused by air in fuel?

Which of the following CN booster compounds can increase the CN of the fuels by as much as seven points in small concentrations (0.2%)?

Technician A says that placing a fuel heater in a filter housing is the best way to prevent wax and ice crystals from restricting fuel flow. Technician B says that ethanol can be used to dissolve wax and prevent water from crystalizing in fuel filters. Who is correct?

Which of the following can cause can cause abrasive wear and fuel filter plugging?

In the US, diesel fuel properties are regulated by the Environmental Protection Agency (EPA) and:

You are measuring secondary filter output pressure. Technician A says that air can lead to the injector tips of newer high-pressure nozzles being damaged. Technician B says that you connect the gauge to the outlet side of the secondary filter. Who is right?

Technician A says that primary filters typically use chemically treated paper filter media with a micron rating of more than 10 microns. Technician B says that synthetic filter media is used to separate bound, or coalesced, water from fuel inside a primary filter. Who is correct?

Technician A says that coolant is used to heat fuel in fuel-water separators. Technician B says that electrical heating elements keep water and wax from plugging the filter in a fuel-water separator. Who is correct?

Technician A says that diesel fuel's low volatility is why so many diesel fuel pump islands appear to have a lot of spilled fuel. Technician B says that fuel spills at diesel pump islands are more common than those at gasoline pumps because truck drivers are careless when refueling. Who is correct?

Technician A says that diesel fuel's low volatility is why so many diesel fuel pump islands appear to have a lot of spilled fuel. Technician B says that fuel spills at diesel pump islands are more common than those at gasoline pumps because truck drivers are careless when refueling. Who is correct?

The temperature at which wax crystals begin to form in diesel fuel is referred to as its _______.

Technician A says that the primary filter helps extend the life of the secondary filter. Technician B says that the primary filter is located between the engine's high-pressure injection system and the secondary filter. Who is correct?

Which color is fresh, good-quality 2-D diesel fuel when it is commercially retailed?

Which of the following is the result of water contaminating fuel?

The EPA began to limit the sulfur content of on-road diesel fuel in 1993 to 0.05% mass or 500 ppm maximum, which mandated the production of:

What material is not suitable for diesel fuel tanks in mobile applications?

Introduction to Diesel Engines

Diesel Engine Emissions

Cylinder Blocks and Crankshafts

Cylinder Components

Cylinder Heads and Valve Train Mechanisms

Diesel Engine Cooling and Lubrication Systems

Functions of High Pressure Fuel Systems

Governors and Electronic Control Systems

Hydraulic Nozzles

Heui Injection Systems

Common Rail Fuel Systems

Air Induction and Crankcase Ventilation Systems

Fixed Geometry and Wastegated Turbochargers

Variable Geometry and Series Turbochargers

Exhaust Gas Recirculation

Exhaust Aftertreatment Systems

On Board Diagnostics

Filters

Exam 8: Diesel Fuel and Low Pressure Fuel Systems

Which of the following is the best factor to use when determining whether a fuel filter should be replaced?

Which of the following methods is best suited to treating diesel fuel that contains free water while minimizing any potential damage to the fuel system?

What effect does gasoline contamination have on diesel fuel?

Which of the following concerns will NOT be caused by air in fuel?

Which of the following CN booster compounds can increase the CN of the fuels by as much as seven points in small concentrations (0.2%)?

Technician A says that placing a fuel heater in a filter housing is the best way to prevent wax and ice crystals from restricting fuel flow. Technician B says that ethanol can be used to dissolve wax and prevent water from crystalizing in fuel filters. Who is correct?

Which of the following can cause can cause abrasive wear and fuel filter plugging?

In the US, diesel fuel properties are regulated by the Environmental Protection Agency (EPA) and:

You are measuring secondary filter output pressure. Technician A says that air can lead to the injector tips of newer high-pressure nozzles being damaged. Technician B says that you connect the gauge to the outlet side of the secondary filter. Who is right?

Technician A says that primary filters typically use chemically treated paper filter media with a micron rating of more than 10 microns. Technician B says that synthetic filter media is used to separate bound, or coalesced, water from fuel inside a primary filter. Who is correct?

Technician A says that coolant is used to heat fuel in fuel-water separators. Technician B says that electrical heating elements keep water and wax from plugging the filter in a fuel-water separator. Who is correct?

Technician A says that diesel fuel's low volatility is why so many diesel fuel pump islands appear to have a lot of spilled fuel. Technician B says that fuel spills at diesel pump islands are more common than those at gasoline pumps because truck drivers are careless when refueling. Who is correct?

Technician A says that diesel fuel's low volatility is why so many diesel fuel pump islands appear to have a lot of spilled fuel. Technician B says that fuel spills at diesel pump islands are more common than those at gasoline pumps because truck drivers are careless when refueling. Who is correct?

The temperature at which wax crystals begin to form in diesel fuel is referred to as its _______.

Technician A says that the primary filter helps extend the life of the secondary filter. Technician B says that the primary filter is located between the engine's high-pressure injection system and the secondary filter. Who is correct?

Which color is fresh, good-quality 2-D diesel fuel when it is commercially retailed?

Which of the following is the result of water contaminating fuel?

The EPA began to limit the sulfur content of on-road diesel fuel in 1993 to 0.05% mass or 500 ppm maximum, which mandated the production of:

What material is not suitable for diesel fuel tanks in mobile applications?

Introduction to Diesel Engines

Diesel Engine Emissions

Cylinder Blocks and Crankshafts

Cylinder Components

Cylinder Heads and Valve Train Mechanisms

Diesel Engine Cooling and Lubrication Systems

Functions of High Pressure Fuel Systems

Governors and Electronic Control Systems

Hydraulic Nozzles

Heui Injection Systems

Common Rail Fuel Systems

Air Induction and Crankcase Ventilation Systems

Fixed Geometry and Wastegated Turbochargers

Variable Geometry and Series Turbochargers

Exhaust Gas Recirculation

Exhaust Aftertreatment Systems

On Board Diagnostics

Filters