Question 1

Exhaust backpressure is a good indicator of engine load.

Accepted Answer

A) True 
 B)False  True

Question 2

Which of the following is LEAST-Likely a source of emissions?

Accepted Answer

A) Crankcase 
B) Evaporation 
C) Exhaust 
D) Plenum 
A) Crankcase 
B) Evaporation 
C) Exhaust 
D) Plenum D

Question 3

Positive crankcase ventilation systems today are open PCV systems.

Accepted Answer

A) True 
 B)False  False

Question 4

What is the advantage of a PCV valve over a road draft tube?

Accepted Answer

PCV systems are purported to have result

Question 5

Provide a brief description of each of the three types of catalytic converters.

Accepted Answer

There are three types of catalytic conve

Question 6

CO2 is a greenhouse gas that traps heat in the atmosphere.

Accepted Answer

A) True 
 B)False

Question 7

While having a discussion, Technician A says that as the temperature of the engine and air under the hood increases, the evaporation rate of the fuel increases. Technician B says that with the engine running, fresh fuel is always coming into the float bowl. Who is correct?

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 8

The system that is MOST-Likely used to prevent the emission of hydrocarbons in blowby gases from the crankcase by scavenging them from the crankcase and reintroducing them into the combustion chambers is:

Accepted Answer

A) PCV system 
B) PVC system 
C) EGR system 
D) CVS system 
A) PCV system 
B) PVC system 
C) EGR system 
D) CVS system

Question 9

Which of the following statements is LEAST-Likely true?

Accepted Answer

A) A liquid vapor separator is part of the fuel tank or the expansion tank. 
B) The rollover valve has a ball or plunger that blocks the line when the vehicle is started. 
C) A vapor canister is only allowed to purge itself of vapor storage when the engine is running. 
D) Some cars have a rollover valve in the vent line from the fuel tank. 
A) A liquid vapor separator is part of the fuel tank or the expansion tank. 
B) The rollover valve has a ball or plunger that blocks the line when the vehicle is started. 
C) A vapor canister is only allowed to purge itself of vapor storage when the engine is running. 
D) Some cars have a rollover valve in the vent line from the fuel tank.

Question 10

What are the advantages of a PCV system?

Accepted Answer

Besides eliminating one source of air po

Question 11

All of the following statements about the air injection system are true EXCEPT:

Accepted Answer

A) a diverter valve, or a similar type of device, prevents a backfire during deceleration. 
B) a one-way check valve prevents exhaust from backing up into the hoses and pump. 
C) a high-pressure vane-type pump driven by a crankshaft belt provides air. 
D) computer-controlled three-way catalyst systems include an air switching valve that moves the injected air into the exhaust manifold or into part of the catalytic converter. 
A) a diverter valve, or a similar type of device, prevents a backfire during deceleration. 
B) a one-way check valve prevents exhaust from backing up into the hoses and pump. 
C) a high-pressure vane-type pump driven by a crankshaft belt provides air. 
D) computer-controlled three-way catalyst systems include an air switching valve that moves the injected air into the exhaust manifold or into part of the catalytic converter.

Question 12

Manufacturers use engine, ignition, and fuel modifications to achieve federally mandated standards. Briefly discuss two common modifications.

Accepted Answer

- A cool area of fuel remains unburned a

Question 13

A(n) ____________________ is a substance that causes a chemical reaction to occur without undergoing any change to itself.

Accepted Answer

The answer of A(n) ____________________ is a substance that causes...

Question 14

While having a discussion, Technician A says that preventing the injection of air into the reduction (NOX) chamber of the cat helps reduce NOX. Technician B says that this has no effect of NOX. Who is correct?

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 15

____________________ are airborne microscopic particles like dust and soot that are especially prevalent in diesel engine exhaust.

Accepted Answer

The answer of ____________________ are airborne microscopic particles like dust...

Question 16

Aluminum is an oxide of alumina that is very porous.

Accepted Answer

A) True 
 B)False

Question 17

To regulate EGR more accurately, some EGR systems use ____________________, in the same way as fuel injection systems, to rapidly cycle an EGR vacuum control solenoid on and off.

Accepted Answer

pulse widt

Question 18

____________________ is produced when hydrocarbons and oxides of nitrogen react with sunlight to form a dirty yellow-brown haze in the air.

Accepted Answer

Photochemi

Question 19

Carbon monoxide (CO2) emissions result when gasoline is not completely burned.

Accepted Answer

A) True 
 B)False

Question 20

An oxidizing catalyst starts to work at temperatures between ____.

Accepted Answer

A) 100° and 200°F 
B) 200° and 300°F 
C) 300° and 400°F 
D) 500° and 600°F 
A) 100° and 200°F 
B) 200° and 300°F 
C) 300° and 400°F 
D) 500° and 600°F

Exam 43: Emission Control System Fundamentals, Gasoline and Diesel

Exhaust backpressure is a good indicator of engine load.

Which of the following is LEAST-Likely a source of emissions?

Positive crankcase ventilation systems today are open PCV systems.

What is the advantage of a PCV valve over a road draft tube?

Provide a brief description of each of the three types of catalytic converters.

CO2 is a greenhouse gas that traps heat in the atmosphere.

While having a discussion, Technician A says that as the temperature of the engine and air under the hood increases, the evaporation rate of the fuel increases. Technician B says that with the engine running, fresh fuel is always coming into the float bowl. Who is correct?

The system that is MOST-Likely used to prevent the emission of hydrocarbons in blowby gases from the crankcase by scavenging them from the crankcase and reintroducing them into the combustion chambers is:

Which of the following statements is LEAST-Likely true?

What are the advantages of a PCV system?

All of the following statements about the air injection system are true EXCEPT:

Manufacturers use engine, ignition, and fuel modifications to achieve federally mandated standards. Briefly discuss two common modifications.

A(n) ____________________ is a substance that causes a chemical reaction to occur without undergoing any change to itself.

While having a discussion, Technician A says that preventing the injection of air into the reduction (NOX) chamber of the cat helps reduce NOX. Technician B says that this has no effect of NOX. Who is correct?

____________________ are airborne microscopic particles like dust and soot that are especially prevalent in diesel engine exhaust.

Aluminum is an oxide of alumina that is very porous.

To regulate EGR more accurately, some EGR systems use ____________________, in the same way as fuel injection systems, to rapidly cycle an EGR vacuum control solenoid on and off.

____________________ is produced when hydrocarbons and oxides of nitrogen react with sunlight to form a dirty yellow-brown haze in the air.

Carbon monoxide (CO2) emissions result when gasoline is not completely burned.

An oxidizing catalyst starts to work at temperatures between ____.

Introduction to the Automobile

Automotive Careers and Technician Certification

Shop Safety

Shop Management, Service Records, and Parts

Locating Service Information and Specifications

Measuring Tools and Systems

Hardware, Fasteners, Drills, and Thread Repair

Shop Tools

General Shop Equipment

Cleaning Equipment and Methods

Lifting Equipment and Air Compressors

Engine Lubrication

Underhood and Body Inspection Vehicle on Ground

Undercar Inspection and Service

Introduction to the Engine

Engine Classifications and Types

Engine Size and Measurements

Engine Upper End

Engine Lower End and Lubrication System Theory

Cooling System Theory

Cooling System Service

Automotive Belts

Automotive Hoses

Automotive Plumbing: Tubing and Pipe

Basic Electrical System Theory and Repairs

Battery Fundamentals

Battery Service

Starting System Fundamentals

Starting System Service

Charging System Fundamentals

Charging System Service

Lighting and Wiring Fundamentals

Lighting and Wiring Service

Safety, Security, Comfort Systems, and Electrical Accessories

Heating and Air-Conditioning Fundamentals

Heating and Air-Conditioning Service

Ignition System Fundamentals

Ignition System Service

Petroleum Fuels and Alternative Fuel Technologies

Fuel System Fundamentals, Gasoline and Diesel

Fuel System Service

Intake and Exhaust Systemsturbochargers and Superchargers

Emission Control System Service

Electronics and Computer Systems Fundamentals

Electronics and Computer Systems Service

Advanced Emission and On-Board Diagnostics Obd

Diagnosing Engine Performance Problems

Diagnosing Engine Mechanical Problems

Engine Removal and Disassembly

Engine Sealing Gaskets, Fastener Torque

Engine Diagnosis and Service: Cylinder Head and Valve Train

Engine Diagnosis and Service: Block, Crankshaft, Bearings, and Lubrication System

Engine Diagnosis and Service: Piston, Piston Rings, Connecting Rod, Engine Balancing

Ordering Parts, Short and Long Blocks, Engine Assembly

Engine Installation, Break-In, and In-Chassis Repairs

Brake Fundamentals

Brake Service

Antilock Brakes, Traction, and Stability Control

Bearings, Seals, and Greases

CO₂ is a greenhouse gas that traps heat in the atmosphere.

While having a discussion, Technician A says that preventing the injection of air into the reduction (NO_X) chamber of the cat helps reduce NO_X. Technician B says that this has no effect of NO_X. Who is correct?

Carbon monoxide (CO₂) emissions result when gasoline is not completely burned.