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HET4 190404 Electrical/Failure/CVIP > 404aB Truck Electrical Circuit Fundamentals - Part B > Flashcards

404aB Truck Electrical Circuit Fundamentals - Part B Flashcards

1
Q

What component prevents all the warning lights from illuminating when one warning light is illuminated?

a) fusible link
b) buzzer
c) relays
d) isolating diodes

A

d) Isolating diodes

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2
Q

Explain how the alternator R terminal indicates that the alternator is not charging.

A

By using the alternator (R) or relay terminal and a relay. The only time a voltage is available from the relay terminal is when the alternator is generating an output. When you turn the ignition switch on, with the engine not running, the warning lamp illuminates; this occurs by means of current from the ignition switch passing through the normally closed contacts of the relay. When the alternator starts to charge, voltage from the alternator relay terminal energizes the relay windings. This moves the armature within the relay from terminal 87a to terminal 87, opening the circuit. This causes the light to go out.

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3
Q

List the three (3) types of analog gauges.

A
  • balancing coil gauge
  • stepper motor gauge
  • air core gauge
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4
Q

How does a digital gauge receive its signal?

a) from fibre optic cable
b) by an analog signal from the sending unit
c) over the truck’s data link
d) by a capillary tube

A

c) over the truck’s data link

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5
Q

A Hall effect sensor sends an amperage signal to the ammeter by:

a) measuring the current along the shunt.
b) using an integrated circuit amplifier.
c) reversing the current flow.
d) grounding the signal from the alternator.

A

b) using an integrated circuit amplifier.

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6
Q

Calculate the PPM for a truck equipped with a rear axle ratio of 4.56, tire revs/mile of 518 and a chopper wheel with 16 teeth.

a) 25983
b) 34063
c) 37793
d) 46081

A

c) 37793

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7
Q

What term describes the speed of data transfer over a network?

a) bits per second
b) baud rate
c) data transfer rate
d) protocol

A

b) baud rate

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8
Q

What term describes the communication network that connects to all of the multiplexed components of a vehicle system?

a) Controller Area Network
b) protocol
c) topology
d) data bus

A

d) data bus

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9
Q

What term describes the logic structure of the control modules in which no single module has priority over another?

a) Controller Area Network
b) protocol
c) topology
d) data bus

A

c) topology

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10
Q

What term describes a common language communicated between control modules?

a) Controller Area Network
b) protocol
c) topology
d) data bus

A

b) protocol

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11
Q

Multiplexing reduces the number of conductors used on heavy equipment by:

a) eliminating redundant outputs.
b) reducing the number of control modules.
c) using larger conductor gauges.
d) allowing control modules to share data for inputs.

A

d) allowing control modules to share data for inputs.

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12
Q

What is the baud rate of J1939 -11/CAN2.0 data link?

a) 9.6 kb/s
b) 100 kb/s
c) 250 kb/s
d) 1.0 Mb/s

A

c) 250 kb/s

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13
Q

Which of the following determines message priority on a combination data bus?

a) the control module with the highest priority
b) a priority code embedded in the message
c) CAN messages have priority over J1708 messages
d) the order in which they are received

A

b) a priority code embedded in the message

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14
Q

Message corruption is reduced on a J1587/J1708 data link by using a/n:

a) unshielded twisted wire pair
b) shielded twisted wire pair
c) unshielded twisted wire pair and terminating resistors
d) shielded twisted wire pair and terminating resistors

A

a) unshielded twisted wire pair

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15
Q

Which of the following best describes the function of the message identifier (MID)?

a) indicates the source address of the transmitting node
b) indicates what parameter the message contains
c) terminates the message
d) defines the type of failure

A

a) indicates the source address of the transmitting node

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16
Q

Which of the following best describes the function of the parameter identifier (PID)?

a) indicates the source address of the transmitting node
b) indicates what parameter the message contains
c) terminates the message
d) defines the type of failure

A

b) indicates what parameter the message contains

17
Q

Which of the following best describes the function of the checksum?

a) indicates the source address of the transmitting node
b) indicates what parameter the message contains
c) terminates the message
d) defines the type of failure

A

c) terminates the message

18
Q

Which of the following best describes the failure mode identifier (FMI)?

a) indicates the source address of the transmitting node
b) indicates what parameter the message contains
c) terminates the message
d) defines the type of failure

A

d) defines the type of failure

19
Q

When testing the J1587/1708 signal, between which two pins do you measure the low (-) signal on the Deutsch HD10-9-1939 diagnostic connector?

a) between pins A and B
b) between pins A and G
c) between pins A and F
d) between pins F and G

A

b) between pins A and G

20
Q

What protocol does the J1939 data link use?

a) J1708
b) J1939-11
c) CAN
d) SAE

A

c) CAN

21
Q

What determines if an information bit is dominate (0) or recessive (1) on a J1939 data link?

a) voltage difference between CAN-High (+) and CAN-Low (-)
b) voltage sum between CAN-High (+) and CAN-Low (-)
c) voltage pulse duration on CAN-High (+) and CAN-Low (-)
d) voltage pulse amplitude on CAN-High (+) and CAN-Low (-)

A

a) voltage difference between CAN-High (+) and CAN-Low (-)

22
Q

Which of the following best describes the unique number assigned to every message?

a) suspect parameter number (SPN)
b) parameter group number (PGN)
c) failure mode identifier (FMI)
d) subsystem identifier (SID)

A

b) parameter group number (PGN)

23
Q

Which of the following identifies where a specific failure has occurred?

a) suspect parameter number (SPN)
b) parameter group number (PGN)
c) failure mode identifier (FMI)
d) subsystem identifier (SID)

A

a) suspect parameter number (SPN)

24
Q

Terminating resistors are used to terminate the signal on a J1939 data link in order to:

a) prevent standing waves from occurring
b) drop the data link voltage to spec
c) reduce the chance of large voltage spikes occurring
d) increase data link resistance to 240 ohms

A

a) prevent standing waves from occurring

25
Q

When testing the J1939/CAN data link resistance, between which two pins do you take the resistance check?

a) pins A and B
b) pins C and D
c) pins E and F
d) pins G and H

A

b) pins C and D

26
Q

What is the expected result when testing the resistance of the J1939?

a) 60 Ω
b) 120 Ω
c) 240 Ω
d) 1- 4M Ω

A

a) 60 Ω

27
Q

Which of the following modules controls other modules?

a) switch expansion module (SEM)
b) expansion module (EXM)
c) chassis control module (CHM)
d) bulkhead control module (BHM)

A

d) bulkhead control module (BHM)

HET4 190404 Electrical/Failure/CVIP (5 decks)

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