CDL COMBINATION PRACTICE TEST DELAWARE
11.
You should always try to back toward the driver's side because:
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backing toward the left side is more dangerous.
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you can watch the rear of your vehicle out the side window.
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you can more easily correct any steering errors.
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None of the above.
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12.
Inspecting the fifth-wheel does NOT include:
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checking for missing or damaged parts.
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making sure that the fifth-wheel plate is greased as required.
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ensuring the fifth wheel is in the proper position for coupling.
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checking the area around the vehicle.
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13.
What can cause poor traction?
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Too much weight on the steering axle.
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Overloading the truck.
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Too little weight on the driving axles.
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All of the above.
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14.
The two most important things that a driver can do to prevent a rollover when driving a combination vehicle are:
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Keeping cargo near the ground and driving slowly on the highway
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Keeping cargo near center of vehicle and driving slowly on the highway
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Keeping cargo near the center of the vehicle and driving slowly on turns
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Driving slowly around turns and keeping the cargo as close to the ground as possible
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15.
As part of your vehicle inspection, you are checking that air flows to all trailers. After using the trailer handbrake to provide air to the service line, you go to the rear of the rig. When you open the emergency line shut-off valve at the rear of the last trailer, you should hear:
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a thumping sound.
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air escaping from the open valve.
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the service line valve close.
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a mechanical vibration.
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16.
After starting the engine, the ABS light stays on. This means:
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the ABS is not working properly.
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the ABS is in Neutral.
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the ABS is working properly.
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the ABS oil level is not adequate.
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17.
Which of these is more likely to rollover due to the "crack-the-whip" effect?
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The front trailer of 65 ft. conventional doubles
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The last trailer of doubles
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5-axle tractor semitrailers
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The last trailer of triples
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18.
Hanging meat in a refrigerated truck can be:
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a very stable load if properly distributed.
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a very unstable load with a high center of gravity.
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a very stable load with a low center of gravity.
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a very unstable load with a low center of gravity.
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19.
In combination vehicles with air brakes, the trailer air supply control should pop out when the air pressure falls within the range of:
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50 to 75 psi
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20 to 45 psi
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100 to 120 psi
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10 to 20 psi
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20.
Which of the following is NOT TRUE? When you drive a tractor-trailer combination with ABS, you should:
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monitor your tractor and trailer as you slow down, and if it is safe to do so, back off the brakes to stay in control.
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use only the braking force necessary to stop safely.
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drive slower to keep your vehicle in a straight line.
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brake the same way, regardless of whether you have ABS on the tractor, the trailer, or both.
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