Question 1

Which organization is responsible for classifying diesel fuel to a standard?

Accepted Answer

A)   SAE
B)   API
C)   ATA
D)   ASTM

Question 2

A substance that enables a chemical reaction without itself undergoing any change is known as a:

Accepted Answer

A)   fraction
B)   catalyst
C)   polymer
D)   reactant

Question 3

Which of the following values is used to measure the heat energy (calorific value)  in a fuel?

Accepted Answer

A)   BTU
B)   BHP
C)   CNG
D)   RON

Question 4

What is the source of 60% of the energy consumed in North America?

Accepted Answer

A)   hydro electricity
B)   coal
C)   petroleum
D)   nuclear fusion C

Question 5

What is the main ingredient found in a diesel fuel conditioner?

Accepted Answer

A)   alcohol
B)   cetane improver
C)   cleaning additives
D)   pour point depressant

Question 6

What is the maximum sulfur content in a diesel fuel classified as ultralow sulfur (ULS)  in North America?

Accepted Answer

A)   300 ppm
B)   500 ppm
C)   50 ppm
D)   15 ppm

Question 7

Which of the following would be a typical specific gravity rating of a #2D diesel fuel?

Accepted Answer

A)   0.557
B)   0.675
C)   0.825
D)   1.225

Question 8

Which is the most efficient method of separating the highest fractions found in crude petroleum?

Accepted Answer

A)   distillation
B)   vaporization
C)   thermal cracking
D)   catalytic cracking

Question 9

Which of the following terms is used to describe the anti-knock ability of a gasoline?

Accepted Answer

A)   cetane number
B)   fire point
C)   oxidation stability
D)   octane rating

Question 10

Technician A says that biodiesel has a short shelf life compared with petroleum sourced diesel fuel. Technician B says that degraded biodiesel can result in costly fuel problems. Who is correct?

Accepted Answer

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

Question 11

Which of the following terms describes the tendency of a liquid to vaporize?

Accepted Answer

A)   volatility
B)   combustibility
C)   condensivity
D)   viscosity

Question 12

Technician A says that ULS is now mandatory for all on-highway diesel engine applications. Technician B says that ULS is now mandatory for all off-highway mobile diesel engines. Who is correct?

Accepted Answer

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

Question 13

What is the lowest CN value that any #1D or #2D fuel formulated for highway use can be legally sold at?

Accepted Answer

A)   38
B)   40
C)   45
D)   47

Question 14

What substance is commonly added to truck diesel fuel tanks to prevent winter freeze up?

Accepted Answer

A)   ethylene glycol
B)   alcohol
C)   dispersants
D)   antifreeze B

Question 15

Technician A says that fuel costs are second only to tires when reviewing the operating expenses of trucks on our highways. Technician B says that as fuel costs rise, this provides a competitive advantage to large fleets over individual-owner operators. Who is correct?

Accepted Answer

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

Question 16

Which of the following terms describes the amount of heat energy in a fuel?

Accepted Answer

A)   calorific value
B)   cetane number
C)   fire point
D)   volatility

Question 17

Technician A says that diesel fuel in a vehicle tank can degrade when exposed to high temperatures. Technician B says that the most volatile fractions in a diesel fuel are the ones that define the CN of the fuel. Who is correct?

Accepted Answer

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

Question 18

What is the specific gravity at 15 degrees Celsius of a diesel fuel with an API gravity of 37 degrees?

Accepted Answer

A)   0.8398
B)   0.8137
C)   0.7988
D)   0.7890

Question 19

Which of the following acronyms is commonly used to describe the actual ratio of fuel and air in a combustion reaction?

Accepted Answer

A)   ASTM
B)   AFR
C)   SSU
D)   RON

Question 20

Which of the following acronyms defines the ignition quality of a diesel fuel?

Accepted Answer

A)   CNG
B)   RON
C)   MON
D)   CN

Exam 18: Diesel Fuel Characteristics

Which organization is responsible for classifying diesel fuel to a standard?

Correct AnswerverifiedShow Answer

A substance that enables a chemical reaction without itself undergoing any change is known as a:

Correct AnswerverifiedShow Answer

Which of the following values is used to measure the heat energy (calorific value) in a fuel?

Correct AnswerverifiedShow Answer

What is the source of 60% of the energy consumed in North America?

Correct AnswerverifiedC

What is the main ingredient found in a diesel fuel conditioner?

Correct AnswerverifiedShow Answer

What is the maximum sulfur content in a diesel fuel classified as ultralow sulfur (ULS) in North America?

Correct AnswerverifiedShow Answer

Which of the following would be a typical specific gravity rating of a #2D diesel fuel?

Correct AnswerverifiedShow Answer

Which is the most efficient method of separating the highest fractions found in crude petroleum?

Correct AnswerverifiedShow Answer

Which of the following terms is used to describe the anti-knock ability of a gasoline?

Correct AnswerverifiedShow Answer

Technician A says that biodiesel has a short shelf life compared with petroleum sourced diesel fuel. Technician B says that degraded biodiesel can result in costly fuel problems. Who is correct?

Correct AnswerverifiedShow Answer

Which of the following terms describes the tendency of a liquid to vaporize?

Correct AnswerverifiedShow Answer

Technician A says that ULS is now mandatory for all on-highway diesel engine applications. Technician B says that ULS is now mandatory for all off-highway mobile diesel engines. Who is correct?

Correct AnswerverifiedC

What is the lowest CN value that any #1D or #2D fuel formulated for highway use can be legally sold at?

Correct AnswerverifiedShow Answer

What substance is commonly added to truck diesel fuel tanks to prevent winter freeze up?

Correct AnswerverifiedB

Technician A says that fuel costs are second only to tires when reviewing the operating expenses of trucks on our highways. Technician B says that as fuel costs rise, this provides a competitive advantage to large fleets over individual-owner operators. Who is correct?

Correct AnswerverifiedShow Answer

Which of the following terms describes the amount of heat energy in a fuel?

Correct AnswerverifiedShow Answer

Technician A says that diesel fuel in a vehicle tank can degrade when exposed to high temperatures. Technician B says that the most volatile fractions in a diesel fuel are the ones that define the CN of the fuel. Who is correct?

Correct AnswerverifiedShow Answer

What is the specific gravity at 15 degrees Celsius of a diesel fuel with an API gravity of 37 degrees?

Correct AnswerverifiedShow Answer

Which of the following acronyms is commonly used to describe the actual ratio of fuel and air in a combustion reaction?

Correct AnswerverifiedShow Answer

Which of the following acronyms defines the ignition quality of a diesel fuel?

Correct AnswerverifiedShow Answer

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C

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C

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B

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