CDL COMBINATION PRACTICE TEST TEXAS

11. Whenever you back up with a trailer, position your vehicle so you can back in a straight line. If you must back on a curved path, back toward:
Neither side (do not back).
the right side.
Either side.
the driver's side.
12. When uncoupling, after you unlock the fifth-wheel you should:
chock the trailer wheels.
pull the tractor partially clear of the trailer.
ease the pressure on the locking jaws.
pull the tractor clear of the trailer.
13. If an item placed on a flatbed trailer is 7 feet long, it should have __ tie-downs.
1
7
3
2
14. If your vehicle thumps or vibrates heavily, it may be a sign that:
the brakes have failed.
one of the tires has gone flat.
you need to shift up.
the engine belt is loose.
15. When you are driving on a slippery road, you should NOT:
take curves at slower speeds.
adjust turning and braking to road conditions.
use the engine brake or speed retarder.
keep a longer following distance.
16. You must check that all shut-off valves are in the open position except the ones:
on the first trailer in a set of triples.
on the middle trailer of a set of triples.
on the first trailer in a set of doubles.
at the back of the last trailer.
17. At speeds below 40 mph, you should leave at least one second in front of you for each ___ feet of vehicle length.
30
10
5
20
18. Before driving a vehicle with a dual air brake system, you should allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
150 psi
50 psi
100 psi
35 psi
19. Which of these is NOT part of the basic method for shifting up?
Release the accelerator, push in the clutch and shift to neutral at the same time.
Push in the clutch and shift to the higher gear at the same time.
Release the clutch and press the accelerator at the same time.
Accelerate while pressing the clutch and turn toward the driver's side.
20. When you park trailers without spring brakes, you should use wheel chocks:
to prevent the transmission from shifting up.
to prevent air from escaping.
to keep the trailer from moving.
to prevent overheating.
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