Question 1

If cylinder valves are set loose, which of the following performance-altering conditions will result?

Accepted Answer

A)  advanced valve timing 
B)  hotter valve operating temperatures 
C)  noisier valve operation 
D)  retarded valve timing 
A)  advanced valve timing 
B)  hotter valve operating temperatures 
C)  noisier valve operation 
D)  retarded valve timing D

Question 2

What does the left side camshaft actuate in a pre-2010 Cummins ISX engine?

Accepted Answer

A)  engine brake 
B)  exhaust valves 
C)  mechanical fuel injectors 
D)  intake valves 
A)  engine brake 
B)  exhaust valves 
C)  mechanical fuel injectors 
D)  intake valves C

Question 3

When a camshaft has three profiles per engine cylinder, what is the center cam profile used for?

Accepted Answer

A)  intake valve actuation 
B)  exhaust valve actuation 
C)  unit injector actuation 
D)  fuel pump actuation 
A)  intake valve actuation 
B)  exhaust valve actuation 
C)  unit injector actuation 
D)  fuel pump actuation C

Question 4

Which of the following is a required test for a push tube before returning it to service?

Accepted Answer

A)  measure diameter with a micrometer 
B)  measure length with a shop ruler 
C)  roll on a true flat surface 
D)  magnetic flux test 
A)  measure diameter with a micrometer 
B)  measure length with a shop ruler 
C)  roll on a true flat surface 
D)  magnetic flux test

Question 5

Which of the following terms is used to describe the shortest radial dimension of a cam profile?

Accepted Answer

A)  inner base circle 
B)  outer base circle 
C)  lift flank 
D)  unload flank 
A)  inner base circle 
B)  outer base circle 
C)  lift flank 
D)  unload flank

Question 6

Technician A says that camshafts are used to convert linear motion into rotary force. Technician B says that a valve rocker can be considered to be part of the valve train actuated by cam profile. 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

In an in-line 6 cylinder, 4-stroke cycle diesel engine, what is the spacing between power strokes?

Accepted Answer

A)  60 degrees 
B)  90 degrees 
C)  120 degrees 
D)  180 degrees 
A)  60 degrees 
B)  90 degrees 
C)  120 degrees 
D)  180 degrees

Question 8

What is the recommended method of measuring camshaft endplay?

Accepted Answer

A)  dial indicator 
B)  depth micrometer 
C)  thickness gauges 
D)  calipers 
A)  dial indicator 
B)  depth micrometer 
C)  thickness gauges 
D)  calipers

Question 9

What is the rocker ratio of a rocker that converts 1 inch of cam lift into 1.5 inches of travel?

Accepted Answer

A)  1 : 3 
B)  1 : 2 
C)  1 : 1.5 
D)  1 : 1 
A)  1 : 3 
B)  1 : 2 
C)  1 : 1.5 
D)  1 : 1

Question 10

What part of a rocker contacts either the valve stem or valve bridge?

Accepted Answer

A)  adjusting screw 
B)  boss 
C)  pallet 
D)  yoke 
A)  adjusting screw 
B)  boss 
C)  pallet 
D)  yoke

Question 11

On a typical in-line 6 cylinder, 4-stroke cycle diesel engine, when piston #5 is at TDC on it's compression stroke, which valves can be adjusted?

Accepted Answer

A)  #5 
B)  #2 
C)  #4 
D)  #6 
A)  #5 
B)  #2 
C)  #4 
D)  #6

Question 12

The injector cam profile on a camshaft shows visible deterioration of the hard surfacing. What should be done?

Accepted Answer

A)  polish with an emery cloth 
B)  machine smooth 
C)  replace camshaft 
D)  repair by metalizing 
A)  polish with an emery cloth 
B)  machine smooth 
C)  replace camshaft 
D)  repair by metalizing

Question 13

Which of the following would provide the correct cam lift dimension?

Accepted Answer

A)  OBC minus IBC 
B)  shaft centerline to toe dimension 
C)  IBC minus OBC 
D)  lift flank minus unload flank dimension 
A)  OBC minus IBC 
B)  shaft centerline to toe dimension 
C)  IBC minus OBC 
D)  lift flank minus unload flank dimension

Question 14

Technician A says that camshaft rotation must be in the same direction as crankshaft rotation. Technician B says that camshaft rotation may be opposite to crankshaft rotation. Who is right?

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 15

How many keepers are required to retain one cylinder valve?

Accepted Answer

A)  one 
B)  two 
C)  four 
D)  eight 
A)  one 
B)  two 
C)  four 
D)  eight

Question 16

When a valve cam ramps from base circle to outer base circle, what is happening to the valve it actuates?

Accepted Answer

A)  it is stationary 
B)  it is opening 
C)  it is closing 
D)  it is fully open 
A)  it is stationary 
B)  it is opening 
C)  it is closing 
D)  it is fully open

Question 17

Which of the following terms is used to describe the largest radial dimension of a cam profile?

Accepted Answer

A)  inner base circle 
B)  outer base circle 
C)  lift flank 
D)  unload flank 
A)  inner base circle 
B)  outer base circle 
C)  lift flank 
D)  unload flank

Question 18

Which of the following tools should be used to check the operation of an installed valve rotator?

Accepted Answer

A)  light nylon hammer 
B)  dial bore gauge 
C)  outside micrometer 
D)  stethoscope 
A)  light nylon hammer 
B)  dial bore gauge 
C)  outside micrometer 
D)  stethoscope

Question 19

What is a major advantage of a valve rotator?

Accepted Answer

A)  sharper interference angle may be used 
B)  reduce carbon buildup on seat 
C)  lower tension valve springs can be used 
D)  exhaust valves run cooler 
A)  sharper interference angle may be used 
B)  reduce carbon buildup on seat 
C)  lower tension valve springs can be used 
D)  exhaust valves run cooler

Question 20

When machine grinding valves, which of the following specifications requires close observation?

Accepted Answer

A)  fillet 
B)  valve protrusion 
C)  valve recession 
D)  margin 
A)  fillet 
B)  valve protrusion 
C)  valve recession 
D)  margin

Exam 8: Engine Feedback Assembly

If cylinder valves are set loose, which of the following performance-altering conditions will result?

What does the left side camshaft actuate in a pre-2010 Cummins ISX engine?

When a camshaft has three profiles per engine cylinder, what is the center cam profile used for?

Which of the following is a required test for a push tube before returning it to service?

Which of the following terms is used to describe the shortest radial dimension of a cam profile?

Technician A says that camshafts are used to convert linear motion into rotary force. Technician B says that a valve rocker can be considered to be part of the valve train actuated by cam profile. Who is correct?

In an in-line 6 cylinder, 4-stroke cycle diesel engine, what is the spacing between power strokes?

What is the recommended method of measuring camshaft endplay?

What is the rocker ratio of a rocker that converts 1 inch of cam lift into 1.5 inches of travel?

What part of a rocker contacts either the valve stem or valve bridge?

On a typical in-line 6 cylinder, 4-stroke cycle diesel engine, when piston #5 is at TDC on it's compression stroke, which valves can be adjusted?

The injector cam profile on a camshaft shows visible deterioration of the hard surfacing. What should be done?

Which of the following would provide the correct cam lift dimension?

Technician A says that camshaft rotation must be in the same direction as crankshaft rotation. Technician B says that camshaft rotation may be opposite to crankshaft rotation. Who is right?

How many keepers are required to retain one cylinder valve?

When a valve cam ramps from base circle to outer base circle, what is happening to the valve it actuates?

Which of the following terms is used to describe the largest radial dimension of a cam profile?

Which of the following tools should be used to check the operation of an installed valve rotator?

What is a major advantage of a valve rotator?

When machine grinding valves, which of the following specifications requires close observation?

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 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

Dual-Actuator Eui Systems

Heui Fuel Systems

Electronic Unit Pump Eup Systems

Cummins Hpi-Tp

Common Rail Systems

Amplified Common Rail Systems

Review of Electrical and Electronics Fundamentals

Vehicle Computer Systems

Ests and Siss

Electrical Wiring, Connector Terminal Repair

Multiplexing

The Connected Vehicle

Natural Gas, Propane, and Biodiesel Fuels

High Voltage Electricity

Hybrid and Hydrogen Fuel Cell Drivetrains

Electric Powertrains

Bosch Edc Systems

Caterpillar Engine Management Systems

Cummins Management Systems

Detroit Diesel Electronic Controls Ddec

Navistar Diamond Logic

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Volvo and Mack Engine Management

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Servicing Maintenance of Exhaust Aftertreatment Systems

Failure Analysis

Troubleshooting and Diagnostics

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