WorksheetsDSL-204 Chap 37 Anti-Lock Braking, Veh Stability, Collision Sys.
Total questions: 20
Worksheet time: 10mins
________ braking takes place because the control logic inside the ECU can distinguish between normal and abnormal deceleration using an algorithm to calculate whether decelerating wheels are likely to lockup.
Hard
Controlled
Differential
Rapid
What occurs when the drive or steer tires have stopped rotating when braking?
Fishtailing
Oversteer
Wheel slip
Wheel lock-up
An ABS control module on a trailer must be capable of being powered by the trailer's _______.
Back-up light circuit
Ground circuit
Tail light circuit
Stop lamp circuit
Technician A says FMVSS 121 has introduced shorter stopping requirements for heavy trucks-stopping distances have been reduced and new standards include stricter vehicle stability requirements. Technician B says systems must prevent trailer swing-out and jackknifing, and tractors and trailers currently need to remain within an 18-foot-wide (5.48-meter-wide) lane under hard braking conditions. Who is correct?
Technician A only
Technician B only
Both Technician A and Technician B
Neither Technician A nor Technician B
During normal braking applications, the modulator valves are NOT _______.
Conductive
Adaptive
Active
Inactive
After the introduction of ABS, which wire was specified to be dedicated to supply continuous current to the trailer ABS system?
#4 yellow
#5 red
#6 green
#7 blue
When the ABS configuration equips the wheels of only one tandem axle with air suspension, the wheel speed sensors are generally located on the ________.
Axle housing
Mounting block
Lead axle
Trailing axle
What causes the front drive axle tires to grip the road better during braking?
Sensor weight shift
Modulated weight shift
Inertia weight shift
Inertia cargo shift
Which of the following is NOT a common ABS configuration for tractors?
4S/3M
4S/4M
6S/4M
6S/6M
With traction control, a tire that has lost traction and is __________ is instantly identified by comparison with the other wheel speeds on the vehicle.
Spinning too fast
Spinning too slow
Stopped
Sliding
________ control uses the ABS system components to improve vehicle stability in situations when excessive drive torque is transmitted to the wheels, causing the tires to slip or lose traction.
Automatic traction
Yaw
Roll stability
Directional stability
Technician A says roll stability control (RSC) is a vehicle control system that measures lateral acceleration of a vehicle to minimize the likelihood of a vehicle rollover. Technician B says simpler RSC systems will activate only the front brakes of a tractor or truck through the ATC valve. Who is correct?
Technician A only
Technician B only
Both Technician A and Technician B
Neither Technician A nor Technician B
All of the following conditions can cause an untripped rollover, EXCEPT:
High and uneven trailer loads
Heavy gusty winds
Suspension defects causing the vehicle to lean
Wheels begin to lockup on ice
What gives the driver the ability to steer a vehicle through a curve when the tires begin to lose traction?
Electronic control
Adaptive cruise control
Conventional cruise control
Yaw control
Which of the following refers to the rotation of a vehicle around its vertical axis?
Directional stability
Roll stability
Yaw
Torque
For proper operation of a radar sensor, two things are critical. One is an unobscured view of the road. What is the other?
Ability of the sensor to generate a DTC
Precise vertical and lateral alignment
Adaptive cruise control feature
Automatic transmission retarder feature
Which of the following is NOT correct concerning adaptive cruise control (ACC)?
The driver operates the ACC system in a manner similar to conventional cruise control (CCC)
The driver selects a constant speed for the vehicle to automatically maintain
A display screen keeps the driver informed about the system's status
The display indicates when the system is active and its maximum set speed.
The ABS/ATC control modules require a precise ________ between the steer axle and drive axle tires for the ABS and ATC to perform properly.
Rolling circumference ratio
Lateral orientation
Directional calibration
Front-end alignment
When removed, sensor clips should be lubricated with what type of grease?
Oil
Electrically conductive
Chassis
Dielectric
All of the following statements about differential braking are correct, EXCEPT:
Differential braking is a strategy used by traction control systems.
ABS system components are repurposed independently to apply a single brake to the slipping wheel.
Differential braking is used only at high speeds when the wheels are spinning on a slippery surface.
During differential braking, the brakes are applied on a slipping wheel to transfer torque to a stationary or slowly turning wheel with traction
