CDL COMBINATION PRACTICE TEST (ND)
11.
You should use chocks when parking a trailer without spring brakes because:
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it helps prevent skids.
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the brakes will hold only as long as there is air pressure in the trailer air tank.
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it helps prevent brake failure.
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it is required by law.
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12.
How can you tell if a converter dollie has ABS?
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There is an ABS system on the right side of the dolly.
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There is an ABS plaque on the right side of the dolly.
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There is a red lamp on the left side of the dolly.
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There is a yellow lamp on the left side of the dolly.
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13.
If your vehicle thumps or vibrates heavily, it may be a sign that:
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the brakes have failed.
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the engine belt is loose.
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you need to shift up.
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one of the tires has gone flat.
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14.
Loose cargo:
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could fall off your vehicle and cause traffic problems.
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can be a danger to others and yourself.
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could hurt or kill you during a quick stop.
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All of the above.
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15.
If your truck has automatic transmission, you should downshift:
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whenever road conditions allow.
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when going down grades.
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after entering a curve.
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when you need to accelerate.
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16.
A red triangle with an orange center means:
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Slow-moving vehicle
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The vehicle is hauling hazardous materials
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Liquid tanker
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Law enforcement vehicle
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17.
The front trailer supports are up, and the trailer is resting on the tractor. Make sure:
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there is enough clearance between the rear of the tractor frame and the landing gear.
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the electrical and air connections are properly connected between the tractor and the trailer.
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there is enough clearance between the top of the tractor tires and the nose of the trailer.
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All of the above.
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18.
The first thing to do when coupling a tractor-semitrailer is to:
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check the trailer height.
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position the tractor.
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lock the trailer brakes.
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inspect the fifth wheel.
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19.
Combination vehicles _________ than single CMVs.
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require more driving skill
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are safer in bad weather
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are much easier to drive
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All of the above.
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20.
When more cargo is piled up in a truck, the truck becomes easier to turn over. Fully loaded rigs are _________ to roll over in a crash than empty rigs.
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three times more likely
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less likely
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ten times more likely
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five times more likely
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