DOUBLES TRIPLES TEST UT - CDL PRACTICE TEST
11.
If your vehicle is equipped with air brakes, loss of air pressure in the emergency line will cause:
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the trailer supply valve to open.
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the vehicle to slide back and forth.
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the springs to put on the brakes.
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the trailer emergency brakes to come on.
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12.
During a trip you need to inspect the cargo and its securing devices:
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after every break you take.
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within the first 50 miles after beginning a trip.
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every 3 hours or 150 miles.
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All of the above.
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13.
When more than one semitrailer is behind the tractor:
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The order doesn't matter.
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the more heavily loaded trailer should be disconnected.
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the lighter trailer should be in the rear.
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the more heavily loaded semitrailer should be in the rear.
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14.
If you have to drive off the road, you should:
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brake as hard as you can to maintain control.
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fully apply the brakes until your speed has dropped to about 20 mph.
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leave the road completely.
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keep one set of wheels on the pavement, if possible.
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15.
Because of the "crack-the-whip" effect, doubles and triples:
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are more likely to turn over than other combination vehicles.
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are more likely to run out of gas than other combination vehicles.
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can go much faster than other combination vehicles.
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are much slower than other combination vehicles.
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16.
The best way to recognize that your trailer has started to skid is:
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by recognizing tire failure.
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by seeing it in your mirrors.
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by feeling the brakes come on.
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by opening the window and feeling the front of the mirror.
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17.
If you're feeling tired while driving you should:
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eat something.
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increase your speed to get to your destination quicker.
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stop driving and get some rest.
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drink coffee.
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18.
Texting while driving a CMV is:
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prohibited.
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safer than talking on the phone.
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acceptable if the message work-related.
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acceptable if the message less than 140 characters.
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19.
If brakes fail on a long downgrade, you should:
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pump the brake pedal 3 times.
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turn off the engine as soon as you.
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use an escape ramp if it is available.
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set the parking brake.
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20.
Air storage tanks:
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use parts of the service brake systems to stop the vehicle in a brake system failure.
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hold compressed air for the brakes.
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pump air into the air storage tanks.
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are installed in the first tank the air compressor pumps air to.
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