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Florida CDL Combination Test 1
Practice mode
Question
1
of 20
QUESTION 1 / 20
If oil and water build up in your vehicle's air tanks, the brakes:
Choose one answer below.
A
May not work correctly.
✓
B
May feel squishy.
✓
C
Will squeal loudly when used.
✓
D
Will be extremely sensitive.
✓
QUESTION 2 / 20
Failure to keep the fifth wheel plate properly greased could:
Choose one answer below.
A
Cause the trailer to disconnect.
✓
B
Cause steering problems.
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C
Cause braking problems.
✓
D
Affect the lights.
✓
QUESTION 3 / 20
Pull out the trailer air supply control to test:
Choose one answer below.
A
The parking brake.
✓
B
The trailer emergency brakes.
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C
The trailer service brakes.
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D
The landing gear.
✓
QUESTION 4 / 20
Rollovers are most likely to happen when:
Choose one answer below.
A
Drivers turn too fast.
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B
Driver turn too slowly.
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C
It is windy.
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D
It is raining.
✓
QUESTION 5 / 20
A loss of air pressure in the emergency line will cause:
Choose one answer below.
A
The suspension springs to extend.
✓
B
The tractor protection valve to open.
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C
The rear trailer to detach from the combination.
✓
D
The emergency brakes to activate.
✓
QUESTION 6 / 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.
✓
B
Closing the rear shut-off valves and listening for escaping air.
✓
C
Disconnecting air supply lines and listening for escaping air.
✓
D
Rolling each trailer down a hill and testing the brakes.
✓
QUESTION 7 / 20
Starting in which year were newly manufactured trailers required to have ABS?
Choose one answer below.
A
1972
✓
B
1987
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C
1998
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D
2004
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QUESTION 8 / 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 9 / 20
Before backing your tractor under the trailer, make sure your trailer brakes are:
Choose one answer below.
A
Disengaged.
✓
B
Locked.
✓
C
Deactivated.
✓
D
Dry.
✓
QUESTION 10 / 20
When connecting a converter dolly to a second or third trailer, the trailer height should be:
Choose one answer below.
A
Slightly higher than the center of the fifth wheel.
✓
B
Level with the center of the fifth wheel.
✓
C
Slightly lower than the center of the fifth wheel.
✓
D
Next to the center of the fifth wheel.
✓
QUESTION 11 / 20
In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when:
Choose one answer below.
A
Air pressure drops to a level between 20 and 45 psi.
✓
B
You are experiencing a trailer jackknife.
✓
C
Wheels have regained traction after a skid.
✓
D
Air pressure is above 45 psi.
✓
QUESTION 12 / 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
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QUESTION 13 / 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 14 / 20
____ are the cause of more than half of all accident-related truck driver deaths.
Choose one answer below.
A
Truck rollovers
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B
Motorcycles
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C
Slippery roads
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D
Pedestrians
✓
QUESTION 15 / 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 16 / 20
In a sudden turn, the ____ trailer is the most likely to turn over.
Choose one answer below.
A
Front
✓
B
Last
✓
C
Middle
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D
First
✓
QUESTION 17 / 20
When traveling more slowly than 40 mph, maintain at least ____ of following distance per every 10 feet of your vehicle.
Choose one answer below.
A
One second
✓
B
Two seconds
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C
Three seconds
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D
Four seconds
✓
QUESTION 18 / 20
A combination vehicle has:
Choose one answer below.
A
One air line.
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B
Two air lines.
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C
Three air lines.
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D
Four air lines.
✓
QUESTION 19 / 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 20 / 20
Emergency air lines are often coded with the color:
Choose one answer below.
A
Green.
✓
B
Orange.
✓
C
Yellow.
✓
D
Red.
✓
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