OH CDL COMBINATION TEST - PRACTICE TEST

11. When you use your mirrors while driving on the road, you should:
check them quickly.
avoid checking them regularly.
only use the driver's side mirror.
12. 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.
13. Which of these statements about brakes is true?
The lighter the vehicle, the more heat the brakes absorb to stop it.
Brake fade does not result from excessive heat.
None of the above.
14. When backing a tractor under a trailer, you should:
back at an angle.
always use the lowest reverse gear.
stop before when the kingpin is locked into the fifth wheel.
15. Most hydraulic brake failures occur for one of two reasons, one of which is:
relying too much on the engine braking effect.
loss of hydraulic pressure.
excessive downshifting.
16. If your trailer starts to skid, you should:
use the trailer hand brake (if you have one) to straighten out the rig.
keep the rear of your vehicle close to the curb.
release the brakes to get traction back.
17. What is the emergency air line for?
It controls the front brakes of the tractor in case of an emergency.
It tells you the amount of brake pressure you need to stop the vehicle.
It supplies air to the trailer air tanks, and controls the emergency brakes on combination vehicles.
18. At speeds below 40 mph, you should leave at least one second in front of you for each ___ feet of vehicle length.
10
5
20
19. If you will be transporting hazardous materials that require placards, you must:
obtain a special transit permit.
obtain a hazardous materials endorsement.
transport the materials at night only.
20. Empty trucks require _____ stopping distances because empty vehicles have ______ traction.
less; more
greater; less
greater; more
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