E
.
Learndmv
DMV PRACTICE
Toggle navigation
Find your state
Exam types
Practice tests
Sign in
Create account
↗
This quiz has no questions yet.
← Leave quiz
Colorado CDL Combination Test 2
Practice mode
Question
1
of 20
QUESTION 1 / 20
Using the trailer hand brake while experiencing a trailer jackknife will:
Choose one answer below.
A
Stop the skid.
✓
B
Straighten the trailer.
✓
C
Increase traction.
✓
D
Continue the skid.
✓
QUESTION 2 / 20
If unsure if a trailer is equipped with ABS, you can:
Choose one answer below.
A
Check under the trailer for wheel speed sensors coming from the back of the brakes.
✓
B
Try driving on a slippery surface and see if ABS kicks in.
✓
C
Assume it does have ABS.
✓
D
Remove a tire and look for the ABS sensor on the axle.
✓
QUESTION 3 / 20
To lower the risk of a rollover, you should:
Choose one answer below.
A
Load the cargo as far forward as possible.
✓
B
Load the cargo as far back as possible.
✓
C
Load the cargo as low as possible.
✓
D
Stack the cargo as high as possible.
✓
QUESTION 4 / 20
The emergency air line:
Choose one answer below.
A
Is controlled by the foot brake.
✓
B
Is connected to the relay valves.
✓
C
Supplies air to the trailer air tanks.
✓
D
Prevents skids.
✓
QUESTION 5 / 20
Starting in which year were newly manufactured trailers required to have ABS?
Choose one answer below.
A
1972
✓
B
1987
✓
C
1998
✓
D
2004
✓
QUESTION 6 / 20
To test the trailer service brakes, you should:
Choose one answer below.
A
Move the vehicle forward slowly and apply the brakes with the brake pedal.
✓
B
Reverse the vehicle slowly and apply the brakes with the hand control.
✓
C
Reverse the vehicle slowly and apply the brakes with the brake pedal.
✓
D
Move the vehicle forward slowly and apply the brakes with the hand control.
✓
QUESTION 7 / 20
While inspecting a coupling, you should go under the trailer and:
Choose one answer below.
A
Detach the jaws from around the kingpin.
✓
B
Make sure the locking lever is in the "emergency" position.
✓
C
Remove the safety latch.
✓
D
Look into the back of the fifth wheel.
✓
QUESTION 8 / 20
A tractor protection valve is:
Choose one answer below.
A
A device that keeps air in the tractor or truck brake system, should the trailer break away or develop a bad leak.
✓
B
A device that prevents theft.
✓
C
A device that controls fuel levels.
✓
D
A device that allows the battery to recharge efficiently.
✓
QUESTION 9 / 20
After connecting the air lines to the trailer while coupling, you should:
Choose one answer below.
A
Supply air to the trailer.
✓
B
Chock the wheels.
✓
C
Inspect the fifth wheel.
✓
D
Connect the electrical cord.
✓
QUESTION 10 / 20
The easiest way to recognize that your trailer has begun to skid is to:
Choose one answer below.
A
Ask another driver.
✓
B
Use your mirrors to determine if the trailer has left the lane.
✓
C
Release the brake pedal and then push it down again.
✓
D
Watch the jackknife warning light on the control panel.
✓
QUESTION 11 / 20
If a trailer's spring brakes do not release when you push the tractor air supply control, you should:
Choose one answer below.
A
Check the air line connections.
✓
B
Release the pintle hook.
✓
C
Replace the spring brakes.
✓
D
Drive normally without checking anything.
✓
QUESTION 12 / 20
The best way to recognize that your trailer has begun to skid is by:
Choose one answer below.
A
Seeing other drivers' faces.
✓
B
Seeing it in your mirrors.
✓
C
Feeling it.
✓
D
Listening to the radio.
✓
QUESTION 13 / 20
Trailers with low underneath clearance may be difficult to drive:
Choose one answer below.
A
On interstate highways.
✓
B
Over railroad crossings.
✓
C
On dirt roads.
✓
D
At the posted speed limit.
✓
QUESTION 14 / 20
What is another name for the service line?
Choose one answer below.
A
Control line
✓
B
Exchange line
✓
C
Surplus line
✓
D
Parallel line
✓
QUESTION 15 / 20
One way to prevent a rollover is to:
Choose one answer below.
A
Move cargo to the left side of the rig.
✓
B
Keep cargo centered on the rig.
✓
C
Move cargo to the right side of the rig.
✓
D
Keep cargo as far from the ground as possible.
✓
QUESTION 16 / 20
Rollovers happen when:
Choose one answer below.
A
A truck driver is driving too fast.
✓
B
The driver of a vehicle in front of a truck is moving to slowly.
✓
C
A truck driver is driving too slowly.
✓
D
ABS is working effectively.
✓
QUESTION 17 / 20
To prevent a rollover, a driver should:
Choose one answer below.
A
Keep cargo low.
✓
B
Place cargo high.
✓
C
Keep cargo loose.
✓
D
Turn quickly.
✓
QUESTION 18 / 20
When a combination vehicle goes around a corner:
Choose one answer below.
A
The turn should be made as tightly as possible.
✓
B
The front and rear wheels move in different paths.
✓
C
The rear wheels should run over the curb.
✓
D
It is acceptable for street signs to be knocked over if they are too close to the road.
✓
QUESTION 19 / 20
Test the tractor protection valve by:
Choose one answer below.
A
Removing the air supply knob.
✓
B
Removing the parking brake control knob.
✓
C
Releasing air with the brake pedal.
✓
D
Releasing air with the gas pedal.
✓
QUESTION 20 / 20
Rollovers are most likely to happen when:
Choose one answer below.
A
Drivers turn too fast.
✓
B
Driver turn too slowly.
✓
C
It is windy.
✓
D
It is raining.
✓
← Previous
0 of 20 answered
Next question →
Finish & see results →