COMBINATION PRACTICE TEST - ID CDL

11. The service line:
carries air to the parking brake to control the trailer brakes.
carries air and is connected to relay valves which allow the trailer brakes to be applied more quickly.
carries power steering fluid to control the trailer brakes.
12. On any upgrade, gravity:
speed you up.
doubles your speed.
slows you down.
13. After starting the engine, oil pressure should rise to a normal level:
within seconds.
within 6 minutes.
within 2 minutes.
14. If your vehicle has dummy couplers, why should you use them when the air lines are not connected to a trailer?
To prevent water and dirt from getting into the coupler and the air lines.
Because if you don't, you will never build system pressure.
To prevent overheating.
15. Cargo should be properly covered:
to block your view or someone else’s.
to protect people from spilled cargo.
to protect the weather from the cargo.
16. If driving a heavy vehicle, you should:
stay in the left lane.
try to pass other vehicles going uphill.
stay in the right lane.
17. The heavier the vehicle:
the higher the center of gravity will be.
the less work the brakes must do to stop it.
the more work the brakes must do to stop it.
18. When backing, as soon as you see the trailer getting off the proper path, you should:
turn the top of the steering wheel in the direction of the drift.
to keep a firm grip on the steering wheel and continue backing.
turn the top of the steering wheel in the opposite direction of the drift.
19. In a vehicle with a dual air brake system:
one system supplies air to the trailer.
both systems typically operate the regular brakes on the rear axle.
each system has its own air tanks.
20. You should test the coupling by:
locking the pintle hook.
applying the parking brakes so the rig will not move.
pulling against the pin of the second semitrailer.
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