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Colorado CDL Combination Test 1
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Question
1
of 20
QUESTION 1 / 20
Large combination vehicles take the longest amount of time to stop:
Choose one answer below.
A
When fully loaded.
✓
B
When partially loaded.
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C
When empty.
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D
When mostly loaded.
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QUESTION 2 / 20
If you are operating a vehicle built before 1998 and are unsure if the trailer has an Anti-Lock Braking System (ABS), you can:
Choose one answer below.
A
Check for wheel speed sensors coming from the back of the brakes.
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B
Look for a red light on the front right corner of the converter dolly.
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C
Pump the air brakes to activate the ABS.
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D
Assume the vehicle has ABS.
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QUESTION 3 / 20
Look for matching colors when coupling glad hands. Service lines are often:
Choose one answer below.
A
Green.
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B
Orange.
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C
Red.
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D
Blue.
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QUESTION 4 / 20
To help prevent rollovers, you should:
Choose one answer below.
A
Accelerate quickly after stopping.
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B
Drive slowly around turns.
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C
Keep the load near the back of the trailer.
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D
Keep the load on one side of the trailer.
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QUESTION 5 / 20
After coupling, there should be ____ between the upper and lower fifth wheel.
Choose one answer below.
A
No space
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B
Very little space
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C
A lot of space
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D
Three inches of space
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QUESTION 6 / 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.
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B
Try driving on a slippery surface and see if ABS kicks in.
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C
Assume it does have ABS.
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D
Remove a tire and look for the ABS sensor on the axle.
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QUESTION 7 / 20
After connecting the air lines to the trailer while coupling, you should:
Choose one answer below.
A
Supply air to the trailer.
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B
Chock the wheels.
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C
Inspect the fifth wheel.
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D
Connect the electrical cord.
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QUESTION 8 / 20
Emergency air lines are often coded with the color:
Choose one answer below.
A
Green.
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B
Orange.
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C
Yellow.
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D
Red.
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QUESTION 9 / 20
Push in the trailer air supply control to:
Choose one answer below.
A
Activate the emergency brakes.
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B
Deactivate the air brakes.
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C
Sound the horn.
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D
Supply the trailer with air.
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QUESTION 10 / 20
Fully-loaded rigs:
Choose one answer below.
A
Are less likely to roll over than empty rigs.
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B
Are more likely to roll over than empty rigs.
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C
Are just as likely to roll over as empty rigs.
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D
Should not be driven.
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QUESTION 11 / 20
Trailers built before 1975 are:
Choose one answer below.
A
Required to have spring brakes.
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B
Not required to have spring brakes.
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C
Unsafe to drive.
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D
Prohibited from public roadways.
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QUESTION 12 / 20
What does the trailer air supply control look like?
Choose one answer below.
A
It is a square blue knob.
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B
It is a triangular yellow knob.
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C
It is an eight-sided red knob.
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D
It is a circular orange knob.
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QUESTION 13 / 20
Trailers manufactured after ____ must be equipped with Anti-Lock Braking Systems (ABS).
Choose one answer below.
A
1943
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B
1998
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C
2009
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D
2015
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QUESTION 14 / 20
An Anti-Lock Braking System (ABS):
Choose one answer below.
A
Allows wheels to lock up.
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B
Prevents wheels from locking up.
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C
Makes it easier to turn a large vehicle.
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D
Assists with the operation of brake lights.
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QUESTION 15 / 20
When backing a trailer, how should you turn the steering wheel?
Choose one answer below.
A
Turn the top of the steering wheel in the direction you want the trailer to go.
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B
Turn the top of the steering wheel in the direction opposite of where you want the trailer to go.
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C
It doesn’t matter.
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D
It depends on where the trailer is being backed.
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QUESTION 16 / 20
The trailer hand valve should be used:
Choose one answer below.
A
To test the trailer brakes.
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B
To check the connection between the trailer and tractor.
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C
To accelerate.
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D
To test the lights on the trailer.
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QUESTION 17 / 20
If you need to back your trailer but cannot back up in a straight path, you should:
Choose one answer below.
A
Back toward the passenger's side.
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B
Back toward the driver's side.
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C
Swerve back and forth while backing.
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D
Always turn to your right.
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QUESTION 18 / 20
What is off-tracking?
Choose one answer below.
A
When a vehicle’s front wheels follow a different path than its rear wheels
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B
When a vehicle's wheels all follow the exact same path
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C
When a load shifts during a turn
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D
When a vehicle's wheels run over a curb during a turn
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QUESTION 19 / 20
Compared to other commercial motor vehicles, combination vehicles need more space on the road because they are longer and they:
Choose one answer below.
A
Need more space to turn and stop.
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B
Drive more slowly.
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C
Are twice the width.
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D
Swerve more often.
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QUESTION 20 / 20
Before a drive, ensure that air flows to all trailers by:
Choose one answer below.
A
Opening the rear shut-off valves and listening for escaping air.
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B
Closing the rear shut-off valves and listening for escaping air.
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C
Disconnecting air supply lines and listening for escaping air.
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D
Rolling each trailer down a hill and testing the brakes.
✓
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