CALIFORNIA CDL COMBINATION PRACTICE TEST

11. Combination vehicles have __ air lines.
1
2
3
12. You are coupling a tractor to a semi-trailer. You have backed up but are not yet under the trailer. Before backing under the semi-trailer, you should:
connect the electrical cord and check the air lines.
supply air to the trailer system and lock the trailer brakes.
begin raising the landing gear.
13. Overloading a vehicle with cargo can have negative effects on all of the following except:
Weight limits
Braking
Steering
14. If you discover a fire, before opening trailer doors you should:
feel the doors to see if they are hot.
have a helper open the doors.
use the fire extinguisher on the doors.
15. You should always try to back toward the driver's side because:
you can watch the rear of your vehicle out the side window.
backing toward the left side is more dangerous.
None of the above.
16. An item that is 15 feet long placed on a flatbed trailer should have at least:
2 tie-downs.
3 tie-downs.
1 tie-down.
17. At passive railroad crossings, even if there are active railroad signals that indicate the tracks are clear, you must _________  to be sure it is safe to proceed.
go, stop and listen
listen, look and stop
stop, look, and listen
18. To avoid rollbacks when you start, you should:
if you have manual transmission, partly engage the clutch before you take your right foot off the brake.
release the parking brake only when you have applied enough engine power.
All of the above.
19. If your vehicle gets stuck on the railroad tracks, you should:
get out of your vehicle and away from the tracks.
check for identifiable landmarks to give the location of the crossing.
gather up your paperwork and shipping papers while calling 911, then get out of the vehicle.
20. Which of the following is NOT part of testing the trailer service brakes?
Releasing the parking brakes.
Moving the vehicle forward slowly.
Pushing in the trailer air supply knob.
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