CDL COMBINATION PRACTICE TEST (IA)

11. Before starting down a hill, you should:
slow down and shift to a lower gear.
look for an escape route.
release the accelerator and shift to Neutral at the same time.
12. When the trailer breaks away or develops a bad leak, the tractor protection valve will close automatically and:
the trailer supply valve will stay open.
the trailer emergency brakes will come on.
the tractor will lose all air pressure.
13. When driving trucks with trailers, drivers should:
avoid making sudden movements with the steering wheel.
push the brake pedal to the floor when braking.
make quick lane changes.
14. What happens when the center of gravity of a truck moves higher up from the road?
The truck becomes easier to turn over.
The vehicle is more stable while turning.
It is easier it is to turn around corners.
15. When you are uncoupling a loaded trailer, lower the landing gear until:
the tractor frame is under the trailer.
it makes firm contact with the ground.
makes contact with the ground, and leave the trailer off the fifth wheel.
16. In your mirror, you see a car approaching from the rear. The next time you check your mirror, you don't see the car. If you wish to change lanes, you should:
wait until you are sure the car isn't in your blind spot.
ease into the other lane slowly so the other car can get out of the way.
assume the car left the roadway and change lanes as normal.
17. When backing a trailer, you should:
not back up in a straight line.
turn the steering wheel toward the direction you want to go.
pull-up frequently to reposition the vehicle.
18. The use of brakes on a steep downgrade is:
a supplement to the braking effect of the engine.
much more effective than the engine braking effect.
the main braking factor.
19. With brake drums, if brakes become too hot:
the brakes will supply too much power to the drive wheels.
your ABS will malfunction.
the brakes may stop working.
20. Containerized loads:
should exceed gross weight and axle weight limits.
must be inspected before and after the trip.
are generally used for freight carried part way by rail or ship.
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