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CDL Test Doubles Triples Topic Sample Practice Questions

1. When driving with more than one trailer, which trailer should be the first one behind the tractor?
a. The lightest trailer
b. The heaviest trailer
c. The shortest trailer
d. None of the above

2. Converter dollies:
a. Have little braking power because they are small
b. Often do not have spring brakes
c. Usually need a glad hand converter
d. All of the above

3. You are visually checking the coupling of a converter dolly to the rear trailer. How much space should be between the upper and lower fifth wheel?
a. It depends on the load
b. None
c. 1/2 to 3/4 of an inch
d. 1/32 to 3/32 of an inch

4. You are driving a 100 foot truck with double trailers at 30 mph. The road is dry. Visibility is good. You should keep at least ____ seconds of space ahead of you:
a. 9
b. 10
c. 11
d. 12
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5. Driving a truck with double or triple trailers requires a driver to:
a. Do both b & c
b. Use special care in bad weather and mountain conditions
c. Allow more following distance than for smaller vehicles
d. None of the above

a. At highway speed, you should look up to 1/4 mile ahead of your truck
b. Many drivers do not look far enough ahead of their truck
c. Good drivers shift their attention back and forth, near and far
d. All of the above are true

7. When should you check your mirrors while making a lane change?
a. After signaling the change
b. Right after starting the lane change
c. After completing the lane change
d. All of the above

8. How can you be sure you supplied air to a second trailer?
a. Go to the rear of the second trailer and open the emergency line shut off
b. Watch each trailer’s air gauge for a drop of 30 psi
c. Apply the hand valve at 10 mph. You should stop in the same distance as a truck with one trailer at 5 mph.
d. Get out and listen for air flowing through the lines

9. Before you can supply air to the air tanks of a second trailer you need to:
a. Open the shut off valves at the rear of the first trailer, and close the shut off valves at the rear of the second trailer
b. Close the shut off valves at the rear of both trailers
c. Open the shut off valves at the rear of both trailers
d. None of the above

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