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Kansas CDL Combination Test 1
Practice mode
Question
1
of 20
QUESTION 1 / 20
To help prevent rollovers, you should:
Choose one answer below.
A
Accelerate quickly after stopping.
✓
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.
✓
QUESTION 2 / 20
When glad hands are coupled, the seals should be pressed together at an angle of:
Choose one answer below.
A
30 degrees.
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B
45 degrees.
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C
60 degrees.
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D
90 degrees.
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QUESTION 3 / 20
In a double or triple combination:
Choose one answer below.
A
Cargo weight must be evenly distributed between all trailers.
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B
The heaviest trailer should be positioned directly behind the cab.
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C
The heaviest trailer should be positioned in the rear.
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D
The weight of the trailers does not matter.
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QUESTION 4 / 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 5 / 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.
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B
You are experiencing a trailer jackknife.
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C
Wheels have regained traction after a skid.
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D
Air pressure is above 45 psi.
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QUESTION 6 / 20
When backing up to couple a trailer, you should position the tractor:
Choose one answer below.
A
At a 90-degree angle in front of the trailer.
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B
Directly in front of the trailer.
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C
At a 30-degree angle in front of the trailer.
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D
At a 60-degree angle in front of the trailer.
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QUESTION 7 / 20
What is a tractor protection valve?
Choose one answer below.
A
A valve to keep air in the brake system should there be a bad leak
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B
A valve that prevents the truck from being stolen
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C
A valve that prevents the driver from going too fast
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D
A valve that prevents the trailer from accidentally being released
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QUESTION 8 / 20
Having ABS on only one axle:
Choose one answer below.
A
Does not change braking in any way.
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B
Is not possible.
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C
Will allow the driver additional control over their vehicle when braking.
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D
Will cause extra strain on the other axles.
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QUESTION 9 / 20
After finishing a pre-trip inspection, you should:
Choose one answer below.
A
Close the service line valve.
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B
Remove the service line valve.
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C
Leave the emergency line valve open.
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D
Leave the rear shut-off valves open.
✓
QUESTION 10 / 20
Using the trailer hand valve while driving:
Choose one answer below.
A
Will help you turn safely.
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B
Will stop your trailer safely.
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C
Can cause a skid.
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D
Is impossible.
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QUESTION 11 / 20
If the trailer begins to skid, it is best to:
Choose one answer below.
A
Release the brakes.
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B
Accelerate.
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C
Quickly turn the steering wheel one way, then the other.
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D
Brake.
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QUESTION 12 / 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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QUESTION 13 / 20
If a trailer begins to skid, the driver should:
Choose one answer below.
A
Lock the brakes.
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B
Release the brakes.
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C
Steer in the opposite direction.
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D
Accelerate.
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QUESTION 14 / 20
The trailer hand valve:
Choose one answer below.
A
Should always be used for parking.
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B
Should only be used for parking on a downhill.
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C
Should never be used for parking.
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D
Should only be used when transporting cargo.
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QUESTION 15 / 20
The emergency air line:
Choose one answer below.
A
Is controlled by the foot brake.
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B
Is connected to the relay valves.
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C
Supplies air to the trailer air tanks.
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D
Prevents skids.
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QUESTION 16 / 20
Starting in which year were newly manufactured trailers required to have ABS?
Choose one answer below.
A
1972
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B
1987
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C
1998
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D
2004
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QUESTION 17 / 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 18 / 20
Failure to keep the fifth wheel plate properly greased could:
Choose one answer below.
A
Cause the trailer to disconnect.
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B
Cause steering problems.
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C
Cause braking problems.
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D
Affect the lights.
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QUESTION 19 / 20
During a trip, which shut-off valves should be open?
Choose one answer below.
A
All shut-off valves should be open.
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B
The rear shut-off valves should be open.
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C
All shut-off valves should be in the open position, except the rear shut-off valves.
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D
No shut-off valves should be open.
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QUESTION 20 / 20
A loss of air pressure in the emergency line will cause:
Choose one answer below.
A
The suspension springs to extend.
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B
The tractor protection valve to open.
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C
The rear trailer to detach from the combination.
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D
The emergency brakes to activate.
✓
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