VERMONT DOUBLES TRIPLES PRACTICE CDL TEST
11.
Alcohol:
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impairs depth perception.
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does not affect judgement.
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improves reaction time.
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12.
Right after it starts to rain, the road is very slippery. Why?
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Because the water mixes with oil left on the road by vehicles.
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Because rain is very slippery.
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Because black ice may form on the road.
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13.
Air storage tanks:
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hold compressed air for the brakes.
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use parts of the service brake systems to stop the vehicle in a brake system failure.
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pump air into the air storage tanks.
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14.
Skids caused by acceleration can usually be stopped by:
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applying the brakes firmly.
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coming to a complete stop.
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taking the foot off the accelerator.
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15.
If you must stop on a one-way or divided highway, you should place warning devices _______ toward the approaching traffic.
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5, 50 and 500 feet
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10, 100 and 200 feet
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5, 25 and 50 feet
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16.
If an aggressive driver is involved in an accident down the road, you should:
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stop a safe distance from the accident scene, wait for the police and report the behavior you witnessed.
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confront the aggressive driver.
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try to get their vehicle to the side of the road.
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17.
The trolley valve should be used only:
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to test the trailer brakes.
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in driving.
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to prevent skids.
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18.
If your brakes fail on a steep mountain downgrade, you should:
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go right if the shoulder is clear.
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use an escape ramp if it is available.
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leave the road immediately.
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19.
The tractor protection valve:
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keeps your wheels from locking up when you brake hard.
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prevents the trailer from being accidentally released.
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keeps air in the brake system should the trailer develop a bad leak.
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20.
Placards are:
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signs placed on a vehicle to identify the hazard class of the cargo.
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devices placed below a vehicle to improve traction.
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signs put inside a vehicle used to warn others of hazardous materials.
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