AIR BRAKES PRACTICE TEST - DISTRICT OF COLUMBIA
21.
The safety valve is usually set to open at:
|
150 psi.
|
|
|
75 psi.
|
|
|
200 psi.
|
|
|
100 psi.
|
22.
To control your speed on a downgrade, you should:
|
fully apply the brakes.
|
|
|
use engine braking.
|
|
|
use controlled braking.
|
|
|
coast in neutral.
|
23.
When the spring brakes are on, you should never:
|
upshift.
|
|
|
decrease your speed.
|
|
|
change lanes.
|
|
|
push the brake pedal down.
|
24.
Which of the following is NOT TRUE? When you drive a tractor-trailer combination with ABS, you should:
|
drive slower to keep your vehicle in a straight line.
|
|
|
monitor your tractor and trailer as you slow down, and if it is safe to do so, back off the brakes to stay in control.
|
|
|
brake the same way, regardless of whether you have ABS on the tractor, the trailer, or both.
|
|
|
use only the braking force necessary to stop safely.
|
25.
To prevent rollover, you should:
|
drive slowly around on ramps and off ramps.
|
|
|
go slowly around turns.
|
|
|
keep the cargo as close to the ground as possible.
|
|
|
All of the above.
|
GRADE ME
NOT SURE YOU WILL PASS? GET CDL PREMIUM NOW! - Learn More