Question 1

Most fuel system wear takes place with particle contamination of ______ in diameter

Accepted Answer

A) 1-2 microns" 
B) 4-5 microns" 
C) 5-7 microns 
D) 10-20 microns" 
A) 1-2 microns" 
B) 4-5 microns" 
C) 5-7 microns 
D) 10-20 microns"

Question 2

Which of the following properties does B5 diesel fuel have?

Accepted Answer

A) It is red and has 5% sulfur content. 
B) It is 5% animal fat. 
C) It has 5% petroleum content. 
D) It has 5% biologically based content. 
A) It is red and has 5% sulfur content. 
B) It is 5% animal fat. 
C) It has 5% petroleum content. 
D) It has 5% biologically based content.

Question 3

Which ASTM (American Society for Testing Materials) diesel fuel grade has impurities and other characteristics that will quickly damage on-highway engines?

Accepted Answer

A) 1-D" 
B) 2-D" 
C) 3-D 
D) 4-D" 
A) 1-D" 
B) 2-D" 
C) 3-D 
D) 4-D"

Question 4

During a primary fuel filter suction-side pressure test, a slight negative pressure is observed. What is the MOST LIKELY cause?

Accepted Answer

A) Suction-side restriction" 
B) This is a normal condition" 
C) Pressure-side restriction 
D) Defective left pump" 
A) Suction-side restriction" 
B) This is a normal condition" 
C) Pressure-side restriction 
D) Defective left pump"

Question 5

Which of the following diesel fuel performance requirements can minimize wear?

Accepted Answer

A) Starting ease" 
B) Lubricating properties" 
C) Efficient power production 
D) Low noise production" 
A) Starting ease" 
B) Lubricating properties" 
C) Efficient power production 
D) Low noise production"

Question 6

What is used to measure the API number that corresponds to the specific gravity of fuel?

Accepted Answer

A) Fuel hydrometer" 
B) Manometer" 
C) Spectrometer 
D) DMM (Digital Multimeter)" 
A) Fuel hydrometer" 
B) Manometer" 
C) Spectrometer 
D) DMM (Digital Multimeter)"

Question 7

It is particularly important to _______ because many systems today use very little fuel return to the tank, which can carry air and vapors back to the tank.

Accepted Answer

A) replace filters regularly" 
B) use only OEM filters" 
C) check for air 
D) bleed air" 
A) replace filters regularly" 
B) use only OEM filters" 
C) check for air 
D) bleed air"

Question 8

Petroleum diesel fuel is defined in ASTM standard:

Accepted Answer

A) D975" 
B) D976" 
C) D6751 
D) B6751" 
A) D975" 
B) D976" 
C) D6751 
D) B6751"

Question 9

Two technicians are describing the process to determine the API number of a diesel fuel. Technician A says that you use a specific diesel fuel hydrometer to measure the fuel's temperature and API number. Technician B says that because the density of a fuel is affected by temperature, the corrected API value provides the API number that the fuel would have at room temperature. 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

Who establishes diesel fuel standards?

Accepted Answer

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

Question 11

Technician A says that a float sensor can be used in a filter housing to measure the level of water, to determine when the filter should be drained. Technician B says that a probe in the bottom of a fuel filter, which measures the difference between the conductivity of water and fuel, is used to switch on the water-in-fuel warning lamp. 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

What minimum pressure must be maintained to enable the injectors to operate on an HPCR fuel system?

Accepted Answer

A) 100 to 170 psi" 
B) 25 to 35 psi" 
C) 58 to 160 psi 
D) 10 to 20 psi" 
A) 100 to 170 psi" 
B) 25 to 35 psi" 
C) 58 to 160 psi 
D) 10 to 20 psi"

Question 13

Technician A says that adding a little gasoline to diesel fuel will help a diesel engine start faster in cold weather, reduce combustion noise, and improve power output. Technician B says that adding gasoline to diesel fuel will make starting worse, increase combustion noise, and accelerate fuel system wear. 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

Diesel fuel is classified according to its viscosity and density. Which diesel fuel is the most viscous?

Accepted Answer

A) 1D" 
B) 2D" 
C) 3D 
D) 4D" 
A) 1D" 
B) 2D" 
C) 3D 
D) 4D"

Question 15

Technician A says to avoid over servicing filters, but measure filter restriction to obtain the best indication of when a filter requires replacement. Technician B says that to measure a filter restriction, use a vacuum gauge connected with a T-fitting or service port between the transfer pump and 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 16

Diesel fuel is also produced by liquefying hydrocarbon gases, such as methane, and modifying the chemical structure of the hydrocarbon molecules and is manufactured by using a chemical process invented in Germany during the 1920s called the:

Accepted Answer

A) Haber process" 
B) Diesel-Daimler reaction" 
C) Otto cycle 
D) Fischer-Tropsch reaction" 
A) Haber process" 
B) Diesel-Daimler reaction" 
C) Otto cycle 
D) Fischer-Tropsch reaction"

Question 17

Technician A says that adding a little gasoline to diesel fuel will help a diesel engine start faster in cold weather, reduce combustion noise, and improve power output. Technician B says that adding gasoline to diesel fuel will make starting worse, increase combustion noise, and accelerate fuel system wear. 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 18

Which of the following petroleum derivatives is the more favored alternative to biologically based diesel engine fuels?

Accepted Answer

A) Crude oil" 
B) Distillates" 
C) Kerosene 
D) Light hydrocarbons" 
A) Crude oil" 
B) Distillates" 
C) Kerosene 
D) Light hydrocarbons"

Question 19

A naturally high-cetane fuel, such as 1-D, produces less power and increases fuel consumption relative to:

Accepted Answer

A) 5D" 
B) 2D" 
C) 3D 
D) 4D" 
A) 5D" 
B) 2D" 
C) 3D 
D) 4D"

Question 20

What effect does increasing fuel temperature have on diesel engine operation?

Accepted Answer

A) It increases power output. 
B) It reduces power output. 
C) It seems to increase fuel consumption because the fuel occupies more volume. 
D) It causes fuel to become more viscous, resulting in poor fuel atomization. 
A) It increases power output. 
B) It reduces power output. 
C) It seems to increase fuel consumption because the fuel occupies more volume. 
D) It causes fuel to become more viscous, resulting in poor fuel atomization.

Most fuel system wear takes place with particle contamination of ______ in diameter

Which of the following properties does B5 diesel fuel have?

Which ASTM (American Society for Testing Materials) diesel fuel grade has impurities and other characteristics that will quickly damage on-highway engines?

During a primary fuel filter suction-side pressure test, a slight negative pressure is observed. What is the MOST LIKELY cause?

Which of the following diesel fuel performance requirements can minimize wear?

What is used to measure the API number that corresponds to the specific gravity of fuel?

It is particularly important to _______ because many systems today use very little fuel return to the tank, which can carry air and vapors back to the tank.

Petroleum diesel fuel is defined in ASTM standard:

Who establishes diesel fuel standards?

What minimum pressure must be maintained to enable the injectors to operate on an HPCR fuel system?

Diesel fuel is classified according to its viscosity and density. Which diesel fuel is the most viscous?

Diesel fuel is also produced by liquefying hydrocarbon gases, such as methane, and modifying the chemical structure of the hydrocarbon molecules and is manufactured by using a chemical process invented in Germany during the 1920s called the:

Which of the following petroleum derivatives is the more favored alternative to biologically based diesel engine fuels?

A naturally high-cetane fuel, such as 1-D, produces less power and increases fuel consumption relative to:

What effect does increasing fuel temperature have on diesel engine operation?

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

Most fuel system wear takes place with particle contamination of ______ in diameter

Which of the following properties does B5 diesel fuel have?

Which ASTM (American Society for Testing Materials) diesel fuel grade has impurities and other characteristics that will quickly damage on-highway engines?

During a primary fuel filter suction-side pressure test, a slight negative pressure is observed. What is the MOST LIKELY cause?

Which of the following diesel fuel performance requirements can minimize wear?

What is used to measure the API number that corresponds to the specific gravity of fuel?

It is particularly important to _______ because many systems today use very little fuel return to the tank, which can carry air and vapors back to the tank.

Petroleum diesel fuel is defined in ASTM standard:

Who establishes diesel fuel standards?

What minimum pressure must be maintained to enable the injectors to operate on an HPCR fuel system?

Diesel fuel is classified according to its viscosity and density. Which diesel fuel is the most viscous?

Diesel fuel is also produced by liquefying hydrocarbon gases, such as methane, and modifying the chemical structure of the hydrocarbon molecules and is manufactured by using a chemical process invented in Germany during the 1920s called the:

Which of the following petroleum derivatives is the more favored alternative to biologically based diesel engine fuels?

A naturally high-cetane fuel, such as 1-D, produces less power and increases fuel consumption relative to:

What effect does increasing fuel temperature have on diesel engine operation?

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