CDL COMBINATION PRACTICE TEST (NM)

11. Where are shut-off valves?
At the back of each trailer.
At the front and back of each trailer.
At the front of each trailer.
12. Dual tires:
should always come in contact with each other.
should not come in contact with each other.
should come in contact with each other whenever possible.
13. Overloading a vehicle with cargo can have negative effects on all of the following except:
Steering
Weight limits
Braking
14. The tractor protection valve:
supplies air to the trailer air tanks.
controls the emergency brakes on combination vehicles.
keeps air in the tractor brake system should the trailer break away or develop a bad leak.
15. When you back under a trailer:
use lowest reverse gear.
back the tractor slowly.
All of the above.
16. Fully loaded rigs:
are much more likely to roll over than empty rigs.
are just as likely to roll over as empty rigs.
are less likely to roll over than empty rigs.
17. Do not use the trailer hand valve in driving because:
of the danger of making the trailer skid.
the trailer emergency brakes will come on.
All of the above.
18. To prevent a rollover, you should keep the cargo as close to the ground as possible and:
keep the vents clear so they work correctly.
keep an eye on your tires.
go slowly around turns.
19. If you must make an emergency stop, you should:
use the hand brake before the brake pedal.
apply the brakes as hard as you can to lock them.
brake in a way that will keep your vehicle in a straight line.
20. The two most important things that a driver can do to prevent a rollover when driving a combination vehicle are:
Keeping cargo near center of vehicle and driving slowly on the highway
Driving slowly around turns and keeping the cargo as close to the ground as possible
Keeping cargo near the center of the vehicle and driving slowly on turns
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