DISTRICT OF COLUMBIA CDL COMBINATION PRACTICE TEST
View instructions
Drivers who want to drive combination vehicles must pass the combination vehicles test. The District of Columbia CDL combination test consists of 20 questions, and you'll need at least 16 correct answers to pass (80%). The test covers the combination vehicles section of the District of Columbia CDL Manual. Take this practice test now to prepare for the actual DC CDL combination test!
Not Sure You Will Pass?
Get a Pass Guarantee
Get a Pass Guarantee
UPGRADE TO CDL PREMIUM
1.
When driving in very hot weather, the heat will increase the chances of:
|
loss of hydraulic pressure.
|
|
|
suspension system defects.
|
|
|
tire failure.
|
|
|
ABS malfunction.
|
2.
Before starting down a hill, you should:
|
apply the brakes hard.
|
|
|
look for an escape route.
|
|
|
release the accelerator and shift to Neutral at the same time.
|
|
|
slow down and shift to a lower gear.
|
3.
Which of the following is NOT part of the procedure to raise the landing gear?
|
Raising the landing gear all the way up
|
|
|
Using the high range gear, if equipped, to begin raising the landing gear
|
|
|
Safely securing the crank handle, after raising the landing gear
|
|
|
Using the low range gear, if equipped, to begin raising the landing gear
|
4.
Combination vehicles _________ than single CMVs.
|
require more driving skill
|
|
|
are much easier to drive
|
|
|
are safer in bad weather
|
|
|
All of the above.
|
5.
What is the minimum tread depth for tires other than front tires?
|
4/16 inch
|
|
|
2/32 inch
|
|
|
4/32 inch
|
|
|
8/32 inch
|
6.
When the ______ closes, it stops any air from going out of the tractor.
|
height control valve
|
|
|
hand valve
|
|
|
tractor protection valve
|
|
|
alcohol evaporator
|
7.
If are being followed closely, you should:
|
flash your brake lights.
|
|
|
decrease your following distance.
|
|
|
change lanes quickly.
|
|
|
increase your following distance.
|
8.
You should use chocks when parking a trailer without spring brakes because:
|
it helps prevent skids.
|
|
|
it is required by law.
|
|
|
the brakes will hold only as long as there is air pressure in the trailer air tank.
|
|
|
it helps prevent brake failure.
|
9.
With brake drums, if brakes become too hot:
|
the brakes will supply too much power to the drive wheels.
|
|
|
your ABS will malfunction.
|
|
|
the brakes may stop working.
|
|
|
the air compressor will kick on to cool the brakes.
|
10.
What is the proper following distance for a 50 foot truck traveling at 50 mph?
|
6 seconds
|
|
|
5 seconds
|
|
|
10 seconds
|
|
|
25 seconds
|
Next page
NOT SURE YOU WILL PASS? GET CDL PREMIUM NOW! - Learn More
CDL Combination Test (DC)
| Number of questions: | 20 |
| Correct answers to pass: | 16 |
| Passing score: | 80% |
Share This Online CDL Test
Save Time. Learn Faster.Ace Your CDL Test.
UPGRADE TO CDL PREMIUM
Rate this CDL Combination Test ()