Question 1

What is another way of saying algorithm in a vehicle computer processing cycle?

Accepted Answer

A)  mapping 
B)  computing 
C)  driving 
D)  switching 
A)  mapping 
B)  computing 
C)  driving 
D)  switching

Question 2

What is the source address (SA)on the J1939 bus of the transmission controller?

Accepted Answer

A)  SA 00 
B)  SA 03 
C)  SA 12 
D)  SA 25 
A)  SA 00 
B)  SA 03 
C)  SA 12 
D)  SA 25

Question 3

Technician A says that low bus connectors within a J1939 data bus use a 6-pin connector.Technician B says that high bus connectors within a J1939 data bus use a 3-pin connector.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 4

On a truck data bus,how many wires are used to broadcast J1939 message packets?

Accepted Answer

A)  one 
B)  two 
C)  nine 
D)  seventy two 
A)  one 
B)  two 
C)  nine 
D)  seventy two

Question 5

What is used on a green 9-pin J1939 bus DLC receptacle to block access by a black DLC?

Accepted Answer

A)  smaller CAN-H cavity in receptacle 
B)  smaller F-pin cavity in receptacle 
C)  larger F-pin cavity in receptacle 
D)  larger CAN-L cavity in receptacle 
A)  smaller CAN-H cavity in receptacle 
B)  smaller F-pin cavity in receptacle 
C)  larger F-pin cavity in receptacle 
D)  larger CAN-L cavity in receptacle

Question 6

When several SAs/MIDs attempt to broadcast messages over a truck data bus simultaneously,what process ensures that the message with the highest priority gets broadcast first?

Accepted Answer

A)  ack field 
B)  bus arbitration 
C)  message tag 
D)  start of frame 
A)  ack field 
B)  bus arbitration 
C)  message tag 
D)  start of frame

Question 7

Which of the following is another way of saying data bus communications?

Accepted Answer

A)  computer processing 
B)  multiplexing 
C)  flash programming 
D)  downloading 
A)  computer processing 
B)  multiplexing 
C)  flash programming 
D)  downloading

Question 8

How does power line carrier (PLC)trailer-to-tractor multiplexing transmit messages?

Accepted Answer

A)  radio frequency signals superimposed over 12-volt auxiliary wire 
B)  wirelessly 
C)  optically using auxiliary fiber optics 
D)  twisted wire pair 
A)  radio frequency signals superimposed over 12-volt auxiliary wire 
B)  wirelessly 
C)  optically using auxiliary fiber optics 
D)  twisted wire pair

Question 9

What is each data 'message' known as in a multiplexed truck system?

Accepted Answer

A)  server 
B)  client 
C)  signal 
D)  packet 
A)  server 
B)  client 
C)  signal 
D)  packet

Question 10

Which of the following are advantages of a multiplexed truck chassis?

Accepted Answer

A)  reduction in the hard wire circuit 
B)  reduction of input hardware 
C)  information sharing between controllers 
D)  all of the above 
A)  reduction in the hard wire circuit 
B)  reduction of input hardware 
C)  information sharing between controllers 
D)  all of the above

Question 11

If a communications adapter (CA)is RP 1210 compliant,what should it be capable of doing?

Accepted Answer

A)  acting as a serial link between a the data bus and a PC 
B)  deciphering hexadecimal code 
C)  diagnosing non-communicating nodes on the bus 
D)  replacing the requirement for OEM EST-software 
A)  acting as a serial link between a the data bus and a PC 
B)  deciphering hexadecimal code 
C)  diagnosing non-communicating nodes on the bus 
D)  replacing the requirement for OEM EST-software

Question 12

When the LED on a smart switch first flashes,then stays illuminated,what does that tell the operator?

Accepted Answer

A)  switch command is in the process of being effected 
B)  switch command cannot be effected 
C)  switch command has been completed 
D)  switch is defective 
A)  switch command is in the process of being effected 
B)  switch command cannot be effected 
C)  switch command has been completed 
D)  switch is defective

Question 13

What is used to rate the transaction speed of a multiplexed data backbone?

Accepted Answer

A)  K-baud 
B)  processor clock speed 
C)  speed of light 
D)  hertz 
A)  K-baud 
B)  processor clock speed 
C)  speed of light 
D)  hertz

Question 14

When a global parameter group number (PGN)message is broadcast on J1939,what does it target?

Accepted Answer

A)  exclusively to a reader EST 
B)  a discreet controller on the bus 
C)  a specific SA on the bus 
D)  any SA on the bus 
A)  exclusively to a reader EST 
B)  a discreet controller on the bus 
C)  a specific SA on the bus 
D)  any SA on the bus

Question 15

How many terminating resistors are there in a typical smart switch ladder bridge?

Accepted Answer

A)  one for each switch status 
B)  two 
C)  three 
D)  five 
A)  one for each switch status 
B)  two 
C)  three 
D)  five

Question 16

Technician A says that Navistar Diamond Plus multiplexing uses virtual fusing logic to protect FET switched circuits.Technician B says that there are two types of virtual fusing logic used,type 1 cycling and type 2 non-cycling.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 17

Technician A says that most trucks that use a J1939 data bus have provision for the older J1587/1708 data bus.Technician B says that the current J1939 data bus is based on CAN 2.0 communications protocols.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 18

A twisted wire pair requires a full cycle twist of the wires for every ____ distance of travel.

Accepted Answer

A)  one centimeter 
B)  one inch 
C)  two and one half inches 
D)  six centimeters 
A)  one centimeter 
B)  one inch 
C)  two and one half inches 
D)  six centimeters

Question 19

Which companies were responsible for developing the CAN data bus standards that are now used in both automotive and truck multiplex systems?

Accepted Answer

A)  Motorola and Delco 
B)  Delphi and Lucas 
C)  Bosch and Intel 
D)  IBM and HP 
A)  Motorola and Delco 
B)  Delphi and Lucas 
C)  Bosch and Intel 
D)  IBM and HP

Question 20

What is the reason for using a twisted wire pair for the data backbone on J1939 buses?

Accepted Answer

A)  reduces surface area on which electromagnetic interference can act 
B)  increases the surface area available for electromagnetic transmission 
C)  increases the overall toughness of the wire 
D)  reduces the transmissions speeds of data packets to an acceptable level 
A)  reduces surface area on which electromagnetic interference can act 
B)  increases the surface area available for electromagnetic transmission 
C)  increases the overall toughness of the wire 
D)  reduces the transmissions speeds of data packets to an acceptable level

Exam 12: Multiplexing

What is another way of saying algorithm in a vehicle computer processing cycle?

What is the source address (SA)on the J1939 bus of the transmission controller?

Technician A says that low bus connectors within a J1939 data bus use a 6-pin connector.Technician B says that high bus connectors within a J1939 data bus use a 3-pin connector.Who is correct?

On a truck data bus,how many wires are used to broadcast J1939 message packets?

What is used on a green 9-pin J1939 bus DLC receptacle to block access by a black DLC?

When several SAs/MIDs attempt to broadcast messages over a truck data bus simultaneously,what process ensures that the message with the highest priority gets broadcast first?

Which of the following is another way of saying data bus communications?

How does power line carrier (PLC)trailer-to-tractor multiplexing transmit messages?

What is each data 'message' known as in a multiplexed truck system?

Which of the following are advantages of a multiplexed truck chassis?

If a communications adapter (CA)is RP 1210 compliant,what should it be capable of doing?

When the LED on a smart switch first flashes,then stays illuminated,what does that tell the operator?

What is used to rate the transaction speed of a multiplexed data backbone?

When a global parameter group number (PGN)message is broadcast on J1939,what does it target?

How many terminating resistors are there in a typical smart switch ladder bridge?

Technician A says that Navistar Diamond Plus multiplexing uses virtual fusing logic to protect FET switched circuits.Technician B says that there are two types of virtual fusing logic used,type 1 cycling and type 2 non-cycling.Who is correct?

Technician A says that most trucks that use a J1939 data bus have provision for the older J1587/1708 data bus.Technician B says that the current J1939 data bus is based on CAN 2.0 communications protocols.Who is correct?

A twisted wire pair requires a full cycle twist of the wires for every ____ distance of travel.

Which companies were responsible for developing the CAN data bus standards that are now used in both automotive and truck multiplex systems?

What is the reason for using a twisted wire pair for the data backbone on J1939 buses?

Introduction to Servicing Heavy-Duty Trucks

Shop Safety and Operations

Tools and Fasteners

Preventive Maintenance Program

Fundamentals of Electricity

Fundamentals of Electronics and Computers

Batteries

Charging Systems

Cranking Systems

Chassis Electrical Circuits

Diagnosis and Repair of Electronic Circuits

Hydraulics

Clutches

Standard Transmissions

Standard Transmission Servicing

Torque Converters

Automatic Transmissions

Automatic Transmission Maintenance

Electronically Automated Standard Transmissions

Electronically Controlled Automatic Transmissions Ecats

Driveshaft Assemblies

Heavy-Duty Truck Axles

Heavy-Duty Truck Axle Service and Repair

Steering and Alignment

Suspension Systems

Wheels and Tires

Truck Brake Systems

Hydraulic Brakes and Air-Over-Hydraulic Brake Systems

Abs and Ebs

Air Brake Servicing

Vehicle Chassis Frame

Heavy-Duty Truck Trailers

Fifth Wheels and Coupling Systems

Heavy-Duty Heating, ventilation, and Air Conditioning Systems

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