Question 1

What is a seventh injector used for??

Accepted Answer

A)  ?Injecting DEF for DPF regeneration 
B)  ?Injecting H2O for DPF cooling 
C)  ?Injecting diesel fuel for DPF regeneration 
D)  ?Injecting diesel fuel for SCR operation 
A)  ?Injecting DEF for DPF regeneration 
B)  ?Injecting H2O for DPF cooling 
C)  ?Injecting diesel fuel for DPF regeneration 
D)  ?Injecting diesel fuel for SCR operation

Question 2

Which of the following is true of a cooled exhaust gas recirculation (C-EGR) system on a truck diesel engine?

Accepted Answer

A)  lowers HC emissions 
B)  lowers NOx emissions 
C)  lowers both HC and NOx emissions 
D)  improves engine efficiency 
A)  lowers HC emissions 
B)  lowers NOx emissions 
C)  lowers both HC and NOx emissions 
D)  improves engine efficiency

Question 3

What are the root words of smog?

Accepted Answer

A)  sulfur and ozone 
B)  smile and ogle 
C)  smoke and fog 
D)  smolder and ogre 
A)  sulfur and ozone 
B)  smile and ogle 
C)  smoke and fog 
D)  smolder and ogre

Question 4

?Which of the following explanations accurately defines the term freight efficiency as it is used in the trucking industry?

Accepted Answer

A)  ?Fuel economy 
B)  ?Miles per gallon 
C)  ?Maximum use of cargo space 
D)  ?Fuel consumed per ton hauled 
A)  ?Fuel economy 
B)  ?Miles per gallon 
C)  ?Maximum use of cargo space 
D)  ?Fuel consumed per ton hauled

Question 5

What tailpipe emission from a diesel engine is likely to increase under lean burn operation?

Accepted Answer

A)  PM 
B)  NOx 
C)  VOCs 
D)  CO 
A)  PM 
B)  NOx 
C)  VOCs 
D)  CO

Question 6

Technician A says that DPFs requiring fuel dosing can be managed by a dosing control module. Technician B says that DPF dosing cycles can be managed directly by the ECM. Who is correct?

Accepted Answer

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

Question 7

When a reduction catalytic converter is used on a current diesel engine, which of the following emissions would it be attempting to minimize?

Accepted Answer

A)  NOx 
B)  CO 
C)  carbon dioxide 
D)  sulfur dioxide 
A)  NOx 
B)  CO 
C)  carbon dioxide 
D)  sulfur dioxide

Question 8

What type of smog is created primarily by the burning of heavy fossil fuels such as coal and heavy oils?

Accepted Answer

A)  photosynthetic 
B)  ozone 
C)  sulfur dioxide 
D)  particulate matter 
A)  photosynthetic 
B)  ozone 
C)  sulfur dioxide 
D)  particulate matter

Question 9

If a diesel engine is run with a rich air-fuel-ratio, which of the following tailpipe emissions would be likely to increase?

Accepted Answer

A)  HC 
B)  NOx 
C)  sulfur dioxide 
D)  nitrogen dioxide 
A)  HC 
B)  NOx 
C)  sulfur dioxide 
D)  nitrogen dioxide

Question 10

Which of the following ingredients and conditions are required to produce photochemical smog?

Accepted Answer

A)  sulfur, PM and high humidity 
B)  coal dust and carbon dioxide 
C)  HC+NOx+sunlight+time 
D)  PM and VOCs 
A)  sulfur, PM and high humidity 
B)  coal dust and carbon dioxide 
C)  HC+NOx+sunlight+time 
D)  PM and VOCs

Exam 49: Emissions Management

What is a seventh injector used for??

Which of the following is true of a cooled exhaust gas recirculation (C-EGR) system on a truck diesel engine?

What are the root words of smog?

?Which of the following explanations accurately defines the term freight efficiency as it is used in the trucking industry?

What tailpipe emission from a diesel engine is likely to increase under lean burn operation?

Technician A says that DPFs requiring fuel dosing can be managed by a dosing control module. Technician B says that DPF dosing cycles can be managed directly by the ECM. Who is correct?

When a reduction catalytic converter is used on a current diesel engine, which of the following emissions would it be attempting to minimize?

What type of smog is created primarily by the burning of heavy fossil fuels such as coal and heavy oils?

If a diesel engine is run with a rich air-fuel-ratio, which of the following tailpipe emissions would be likely to increase?

Which of the following ingredients and conditions are required to produce photochemical smog?

Introduction

Hand and Shop Tools, Precision Tools, and Units of Measurement

Personal and Safety Awareness

Engine Basics

History of the Heat Engine

Power

Engine Powertrain Components

Engine Feedback Assembly

Engine Housing Components

Engine Lubrication Systems

Engine Cooling Systems

Engine Breathing

Engine Retarders

Servicing and Maintenance

Engine Removal, Disassembly, Cleaning,

Diesel Engine Run- in and Performance Testing

Chemistry and Combustion

Diesel Fuel Characteristics

Fuel Subsystems

Fuel Injection Basics and Governor Principles

Injector Nozzles

Port-Helix Metering Injection Pumps

Inlet-Metering Rotary Distributor Pumps

Sleeve-Metering Rotary Distributor Pumps

Single-Actuator Eui Systems

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Heui Fuel Systems

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Cummins Hpi-Tp

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Review of Electrical and Electronics Fundamentals

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Ests and Siss

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High Voltage Electricity

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