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CDL Vehicle Combination Practice Test
Practice mode
Question
1
of 25
QUESTION 1 / 25
To prevent a rollover, what is one of the recommended driver methods?
Choose one answer below.
A
Keep cargo as high as possible
✓
B
Go quickly around turns
✓
C
Keep the cargo close to the ground
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D
Brake hard before entering a turn
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QUESTION 2 / 25
When should you check the air pressure in your combination vehicle's system?
Choose one answer below.
A
Only during emergency checks
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B
Whenever you stop for fuel
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C
Before you start your journey
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D
Every hour of driving
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QUESTION 3 / 25
What should be done if you notice that one of the glad hands is leaking?
Choose one answer below.
A
Disconnect the glad hands and reattach them
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B
Ignore it if there's no loss of air
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C
Replace it with a new glad hand
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D
Seal it with tape temporarily
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QUESTION 4 / 25
With the trailer resting on the tractor, what should you confirm regarding the landing gear?
Choose one answer below.
A
There is sufficient clearance between the tractor frame and landing gear
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B
The landing gear is perfectly aligned
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C
The trailer is fully loaded
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D
The tires are properly inflated
✓
QUESTION 5 / 25
What action should you take before backing a tractor under a trailer?
Choose one answer below.
A
Ensure the air system is at normal pressure
✓
B
Check the cargo load
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C
Inspect the tires
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D
Remove any obstructions
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QUESTION 6 / 25
What maintenance can speed up the process of rolling up the landing gear?
Choose one answer below.
A
Applying oil to the gears
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B
Greasing the landing gear
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C
Cleaning the landing gear thoroughly
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D
Replacing old parts with new
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QUESTION 7 / 25
What is the ideal amount of space between the upper and lower fifth wheel after coupling?
Choose one answer below.
A
One inch
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B
Two inches
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C
None
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D
Five inches
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QUESTION 8 / 25
What should be done to the trailer before backing the tractor under it?
Choose one answer below.
A
The trailer should be fully raised
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B
The trailer should be lowered slightly
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C
The trailer should be at an equal height with the tractor
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D
The trailer should be detached from the tractor
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QUESTION 9 / 25
How should air and electrical lines from the tractor to the trailer be positioned?
Choose one answer below.
A
Loosely attached
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B
Secured but with enough to loop the turn
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C
Tightly secured
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D
Completely disconnected
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QUESTION 10 / 25
In what position should the front trailer supports be before driving away?
Choose one answer below.
A
Fully lowered with the crank handle secured
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B
Partially raised with the crank handle loose
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C
Fully raised with the crank handle secured in its bracket
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D
In the middle position for stability
✓
QUESTION 11 / 25
What is the best method for handling a trailer skid?
Choose one answer below.
A
Accelerate to regain control
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B
Steer in the opposite direction of the skid
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C
Steer in the direction of the skid and countersteer as necessary
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D
Apply the brakes firmly to stop the skid
✓
QUESTION 12 / 25
In the case of a trailer lift or drop, what action should be avoided while driving?
Choose one answer below.
A
Braking suddenly
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B
Turning sharply
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C
Slowing down
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D
Increasing speed
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QUESTION 13 / 25
How does a combination vehicle's weight affect its braking performance?
Choose one answer below.
A
Heavier vehicles require less distance to stop safely
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B
Heavier vehicles require more distance to stop safely
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C
Weight has no impact on braking performance
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D
Lighter vehicles require more distance to stop safely
✓
QUESTION 14 / 25
What role does load height play in operating a combination vehicle?
Choose one answer below.
A
It has no impact on vehicle operation
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B
It can affect the vehicle's center of gravity and stability
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C
It only affects loading times
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D
It determines the maximum speed allowed
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QUESTION 15 / 25
How often should you check the trailer's load security during transport?
Choose one answer below.
A
Every hour
✓
B
At each fuel stop
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C
Every two hours or during rest stops
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D
Only at the start of the journey
✓
QUESTION 16 / 25
What is a recommended action when approaching a sharp turn with a combination vehicle?
Choose one answer below.
A
Only look at the front wheels
✓
B
Reduce speed and check mirrors
✓
C
Increase speed to clear the turn quickly
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D
Assume all vehicles will yield to you
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QUESTION 17 / 25
How should a driver communicate when operating a combination vehicle?
Choose one answer below.
A
Only by using the horn
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B
Through hand signals, turn signals, and horn appropriately
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C
By flashing headlights
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D
Only through turn signals
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QUESTION 18 / 25
What is one key indicator that your combination vehicle is loaded correctly?
Choose one answer below.
A
The load shifts during transit
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B
There is an even distribution of weight
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C
The trailer is tilted
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D
The vehicle moves erratically
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QUESTION 19 / 25
When coupling a trailer, how do you ensure the fifth wheel is properly locked?
Choose one answer below.
A
Perform a visual check and apply the trailer brakes
✓
B
Only use the trailer brakes to confirm the lock
✓
C
Check the weight of the trailer
✓
D
Only conduct a visual check
✓
QUESTION 20 / 25
After supplying air to the trailer, how can you ensure the brakes are functioning correctly?
Choose one answer below.
A
Check the air pressure gauges
✓
B
Listen for brake sounds after applying and releasing the trailer brakes
✓
C
Look for visible signs of wear on brakes
✓
D
Manually check the brake fluid level
✓
QUESTION 21 / 25
What is a common method to check if the air brakes are functioning properly?
Choose one answer below.
A
Drive at high speed
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B
Perform a brake test before driving
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C
Check that brake lights are working
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D
Observe for warning lights only
✓
QUESTION 22 / 25
After locking the kingpin into the fifth wheel, how should you check the connection?
Choose one answer below.
A
Pulling the tractor ahead gently with trailer brakes locked
✓
B
Visually inspect the connection
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C
Ask a partner to check
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D
Rely on the sound of the lock
✓
QUESTION 23 / 25
What should drivers do to reduce the risk of trailer sway?
Choose one answer below.
A
Drive faster to stabilize the vehicle
✓
B
Ensure proper loading and weight distribution
✓
C
Turn sharply to redirect the trailer
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D
Ignore any signs of sway and continue driving
✓
QUESTION 24 / 25
How should you perform a lane change in a combination vehicle?
Choose one answer below.
A
Change lanes without signaling
✓
B
Signal your intentions, check mirrors, and ensure clear visibility
✓
C
Only check mirrors once
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D
Move quickly to avoid collisions
✓
QUESTION 25 / 25
When is a trailer deemed to be at the right height for coupling?
Choose one answer below.
A
When it is even with the tractor
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B
When it will be raised slightly during backing
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C
When it is at a maximum height
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D
When it is lower than the tractor
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