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Free CDL - Section 6 - Combination Vehicles

You are about to take a FREE Sample of the CDL - Section 6 - Combination Vehicles. The sample test consists of 10 multiple choice questions and answers.

Please select the best answer for each question below and then click "Submit."

1. Railroad-highway crossings often also cause problems when pulling trailers with ________________ underneath clearance.

d.
high
c.
low
b.
narrow
a.
wide

2. If you get stuck on railroad tracks, the first thing to do is:

d.
locate identifiable landmarks
c.
dial 911
b.
check for emergency notification at the crossing
a.
get out of the vehicle

3. The earliest and best way to recognize that the trailer has started to skid is by __________________.

d.
watching steering wheel movements
c.
hearing it from other drivers
b.
listening for the skid
a.
seeing it in your mirrors

4. If there is more than one trailer, the rear wheels of the ______________ trailer will offtrack the most.

c.
last
b.
middle
a.
first

5. If a trailer does not have spring brakes, use ________________ to keep the trailer from moving.

d.
None of the above
c.
straight brakes
b.
the hand valve
a.
wheel chocks

6. The tractor protection valve will close automatically if air pressure is ______________.

c.
within the optimal range
b.
too low
a.
too high

7. The trailer air supply control on newer vehicles is a ____________________.

e.
All of the above
d.
two-way switch
c.
red indicator light
b.
black round button
a.
red eight-sided knob

8. You would push the trailer air supply control in to:

c.
put on the trailer emergency brakes
b.
shut the air off
a.
supply the trailer with air

9. Tractor protection valve controls or "emergency" valves on older vehicles _______________ operate automatically.

d.
All of the above
c.
never
b.
always
a.
sometimes

10. Which one of the following is true about ABS?

d.
ABS only activates when wheels are about to lock up.
c.
ABS decreases your normal braking capability.
b.
ABS increases your normal braking capability.
a.
ABS is a replacement for normal brakes.