Combination Flashcards
The “crack-the-whip” effect can:
Turn over a trailer.
To help prevent rollovers, you should:
Drive slowly around turns.
Large combination vehicles take the longest amount of time to stop:
When empty.
What is off-tracking?
When a vehicle’s front wheels follow a different path than its rear wheels
When backing a trailer, how should you turn the steering wheel?
Turn the top of the steering wheel in the direction opposite of where you want the trailer
to go.
What does the trailer air supply control look like?
It is an eight-sided red knob.
Air pressure in the ____ air line is controlled by either the foot brake or trailer hand brake.
Service
One function of the emergency air line is to:
Control the emergency brakes.
Having ABS on only one axle:
Will allow the driver additional control over their vehicle when braking.
If a trailer begins to skid, the driver should:
Release the brakes.
The trailer hand valve should:
Be used only to test the trailer brakes.
All trailers made after ____ must be equipped with Anti-Lock Braking Systems (ABS).
1998
When a combination vehicle goes around a corner:
The front and rear wheels move in different paths.
If a parked trailer does not have spring brakes, you should keep the trailer from moving by:
Using wheel chocks.
Trailers with low underneath clearance may be difficult to drive:
Over railroad crossings.
A shut-off valve:
Prevents air from escaping an air brake system.
If a trailer is too high:
It may not couple correctly.
After coupling, there should be ____ between the upper and lower fifth wheel.
No space
When uncoupling a trailer, landing gear should be:
Firmly on the ground.
Before a drive, ensure that air flows to all trailers by:
Opening the rear shut-off valves and listening for escaping air.