Exam 50: Servicing Maintenance of Exhaust Aftertreatment Systems

In which of the following applications would you most likely find a diesel particulate filter (DPF) classified as a low temperature filter (LTF)?

(Multiple Choice)

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Question 21

?When a DPF warning light is repeatedly ignored what will result?

(Multiple Choice)

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Question 22

Technician A says that the EPA Highway Diesel Rule permits NG-fueled engines to output higher NOx emissions. Technician B says that the EPA Highway Diesel Rule focuses on the entire rig and therefore includes factors that influence fuel economy that are not engine-related. Who is correct?

(Multiple Choice)

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Question 23

When performing the required throttle snaps during a J1667 opacity test, how long should each snap be held full travel?

(Multiple Choice)

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Question 24

Technician A says that advancing diesel fuel injection timing by one degree can produce greatly increased NOx in the end gas. Technician B says that retarding diesel fuel injection timing tends to increase the output of HC in the exhaust gas. Who is right?

(Multiple Choice)

4.8/5

(92)

Question 25

Showing 21 - 25 of 25

Exam 50: Servicing Maintenance of Exhaust Aftertreatment Systems

In which of the following applications would you most likely find a diesel particulate filter (DPF) classified as a low temperature filter (LTF)?

?When a DPF warning light is repeatedly ignored what will result?

Technician A says that the EPA Highway Diesel Rule permits NG-fueled engines to output higher NOx emissions. Technician B says that the EPA Highway Diesel Rule focuses on the entire rig and therefore includes factors that influence fuel economy that are not engine-related. Who is correct?

When performing the required throttle snaps during a J1667 opacity test, how long should each snap be held full travel?

Technician A says that advancing diesel fuel injection timing by one degree can produce greatly increased NOx in the end gas. Technician B says that retarding diesel fuel injection timing tends to increase the output of HC in the exhaust gas. Who is right?

Introduction

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Chemistry and Combustion

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Fuel Injection Basics and Governor Principles

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