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South Carolina
South Carolina CDL Combination 1
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Q.1
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To prevent a rollover, cargo should be:
Loaded with most weight on the driver’s side of the trailer.
Placed near the rear of the trailer.
Spread out in the trailer.
Q.2
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When connecting a converter dolly to a second trailer, the trailer height should be ____ the center of the fifth wheel.
Level with
Slightly higher than
Slightly lower than
Q.3
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What happens when the wheels of a trailer lock up?
The trailer will usually continue to move in a straight line.
The trailer will disengage.
The trailer will likely swing around.
The trailer will stop.
Q.4
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What is a bobtail tractor?
A tractor without a trailer
A tractor attached to two trailers
A tractor with a tank
Q.5
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When glad hands are coupled, the seals should be pressed together at an angle of:
30 degrees.
45 degrees.
60 degrees.
90 degrees.
Q.6
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A combination vehicle has ____ air line(s).
One
Two
Three
Q.7
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The emergency air line supplies air to the:
Relay valves.
Trailer air tanks.
Signal line.
Q.8
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If the trailer begins to skid, it is best to:
Release the brakes.
Accelerate.
Quickly turn the steering wheel one way, then the other.
Brake.
Q.9
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When backing a trailer, how should you turn the steering wheel?
Turn the top of the steering wheel in the direction you want the trailer to go.
Turn the top of the steering wheel in the direction opposite of where you want the trailer to go.
It doesn’t matter.
It depends on where the trailer is being backed.
Q.10
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In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when air pressure drops to a level between:
20 and 45 psi.
75 and 105 psi.
50 and 65 psi.
Q.11
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Place the trailer air supply control in its "emergency" position to test:
The trailer emergency brakes.
A coupling device.
The anti-lock brakes.
Q.12
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Which type of vehicle is most prone to the “crack-the-whip” effect?
A five-axle tractor semi-trailer
A three-axle tractor semi-trailer
A bobtail tractor
A triple trailer
Q.13
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Rollovers happen when:
You drive too slowly.
You are stopped.
You take a turn too fast.
Q.14
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What is another name for the service line?
Control line
Exchange line
Surplus line
Parallel line
Q.15
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Look for matching colors when coupling glad hands. Service lines are often:
Green.
Orange.
Red.
Blue.
Q.16
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Emergency air lines are often coded with the color:
Green.
Orange.
Yellow.
Red.
Q.17
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Operating a combination vehicle usually requires ____ operating a single vehicle.
Less skill than
About the same level of skill as
More skill than
Exactly the same level of skill as
Q.18
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Large combination vehicles take the longest amount of time to stop:
When fully loaded.
When partially loaded.
When empty.
When mostly loaded.
Q.19
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Rollovers are most likely to happen when:
Drivers turn too fast.
Driver turn too slowly.
It is windy.
It is raining.
Q.20
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When a combination vehicle goes around a corner:
The vehicle must use at least two lanes.
The front and rear wheels will move in different paths.
It is best to allow the rear wheels to drive over the curb.
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