CDL COMBINATION PRACTICE TEST (HI)

11. The only way to stop a front-wheel skid is to:
supply more power to the drive wheels.
countersteer.
let the vehicle slow down.
12. When driving a combination vehicle, which of the following 2 things will help you prevent a rollover?
Keeping the cargo near the ground and driving slowly around turns.
Keeping cargo near the center of the vehicle and driving slowly on the highway.
Keeping cargo near the center of the vehicle and driving slowly on turns.
13. In vehicles with air brakes, the tractor protection valve:
carries air, which is controlled by the trailer hand brake or the foot brake.
keeps air in the tractor or truck brake system.
provides the air pressure used to operate trailer brakes.
14. You should test the coupling by:
locking the pintle hook.
pulling against the pin of the second semitrailer.
applying the parking brakes so the rig will not move.
15. The best way to recognize that your trailer has started to skid is:
by hearing squeaking noises from the wheels.
by seeing it in your mirrors.
by using retarders.
16. If you are driving a 30 foot vehicle at 35 mph, you should leave at least _______ between your vehicle and the vehicle in front of you.
3 seconds
4 seconds
2 seconds
17. When should you use chocks to park a trailer without spring brakes?
Never
Only when parking downhill
Always
18. Hydroplaning:
only occurs at extremely high speeds.
can occur at speeds as low as 30 mph.
only happens when tire pressure is higher than normal.
19. You are driving a modern truck with a manual transmission. When going down a hill you should usually:
use the same gear you would use to go up the hill.
shift into neutral and coast.
use a lower gear than would be required to go up the hill.
20. If the fifth-wheel locking lever is not locked after the jaws close around the kingpin:
the parking brakes are on and the wheels are chocked.
the coupling is not right and you should not drive until you get it fixed.
the parking brakes are on and your vehicle is safe to drive.
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