COMBINATION PRACTICE TEST - TX CDL
11.
When checking the air and electric lines to the trailer, be sure that the air lines are properly connected to the gland hands, and are:
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secured with enough slack for turns.
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secured with enough air leaks for turns.
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properly greased.
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None of the above.
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12.
Fully loaded rigs:
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are less likely to roll over than empty rigs.
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are just as likely to roll over as empty rigs.
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are much more likely to roll over than empty rigs.
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None of the above.
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13.
The two most important things that a driver can do to prevent a rollover when driving a combination vehicle are:
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Driving slowly around turns and keeping the cargo as close to the ground as possible
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Keeping cargo near center of vehicle and driving slowly on the highway
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Keeping cargo near the ground 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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14.
Before entering a curve, you should:
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increase your speed.
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come to a complete stop.
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maintain your speed.
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reduce your speed.
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15.
You supply air to the trailer brake system by:
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connecting the tractor service air line to the trailer service glad hand.
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pulling out the trailer air supply valve.
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plugging the electrical cord into the trailer.
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pushing in the trailer air supply knob.
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16.
A trailer jackknife is more likely to happen when the trailer is:
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overloaded.
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loaded to its full capacity.
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empty.
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None of the above.
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17.
If you begin to feel drowsy while driving, you should:
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get some coffee.
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open your window.
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pull off the road and get some rest.
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get an energy drink.
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18.
The first thing to do when coupling a tractor-semitrailer is to:
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lock the trailer brakes.
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check the trailer height.
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inspect the fifth wheel.
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position the tractor.
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19.
When backing a tractor under a trailer, you should:
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back at an angle.
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stop before when the kingpin is locked into the fifth wheel.
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always use the lowest reverse gear.
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All of the above.
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20.
When driving a combination vehicle, which of the following 2 things will help you prevent a rollover?
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Keeping cargo near the center of the vehicle and driving slowly on the highway.
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Keeping cargo near the ground 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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Keeping the cargo near the ground and driving slowly around turns.
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