CDL COMBINATION PRACTICE TEST (MA)
11.
If you begin to feel drowsy while driving, you should:
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get an energy drink.
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get some coffee.
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pull off the road and get some rest.
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open your window.
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12.
If the spring brakes do not release when you push the trailer air supply control, you should:
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rev or
lug the engine.
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check the air line connections.
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pump the brakes.
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check the electrical cables.
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13.
When looking at your cargo covers in the mirrors while driving, you must be aware that a flapping cover:
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means that the cargo is balanced.
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can tear loose, uncovering the cargo.
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helps keep the cargo as close to the ground as possible.
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keeps the cargo cool.
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14.
Where are shut-off valves?
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At the back of each trailer.
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At the front of each trailer.
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At the front and back of each trailer.
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On converter dollies.
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15.
To prevent a rollover, you should keep the cargo as close to the ground as possible and:
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keep the vents clear so they work correctly.
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keep an eye on your tires.
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go slowly around turns.
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make sure that the release arm is in the engaged position.
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16.
Which of the following will NOT help you prevent rollover?
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Keeping the cargo as close to the ground as possible.
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Driving slowly around turns.
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Using the controlled braking method.
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All of the above.
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17.
When more cargo is piled up in a truck, the center of gravity moves:
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closer to the ground.
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to the right side of the truck.
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to the left side of the truck.
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higher up from the road.
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18.
If a vehicle is equipped with ABS, when you start the engine:
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the ABS indicator light on the dash should come on and then turn off.
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the trailer emergency brakes will come on.
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the wheels will lock up.
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the spring brakes will come on.
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19.
Broken suspension parts can be very dangerous. When inspecting your vehicle for suspension system defects, look for:
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Damaged air suspension systems.
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Spring hangers that allow movement of axle from proper position.
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Broken leaves in a multi-leaf spring.
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All of the above.
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20.
Which of the following is most likely to roll over?
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The rear trailer of a double
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The middle trailer of a triple
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The rear trailer of a triple
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The front trailer of a double
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