WYOMING CDL DOUBLES TRIPLES PRACTICE TEST
11.
When the trailer breaks away or develops a bad leak, the tractor protection valve will close automatically and:
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the engine will shut down.
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the tractor will lose all air pressure.
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the trailer emergency brakes will come on.
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the trailer supply valve will stay open.
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12.
The heavier the vehicle:
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the less work the brakes must do to stop it.
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the higher the center of gravity will be.
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the more work the brakes must do to stop it.
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None of the above.
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13.
On front tires, tread should be at least:
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1/16 inch
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4/16 inch
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4/32 inch
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2/32 inch
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14.
When driving in hot weather, drivers should inspect tires:
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every 3 hours or every 75 miles.
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every 4 hours or every 200 miles.
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every 2 hours or every 100 miles.
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every hour or every 50 miles.
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15.
Emergency lines are often coded with the color ___ to keep from getting them mixed up with the service line.
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yellow.
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white.
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red.
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blue.
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16.
When backing, it is best to:
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try to back in the direction of the drift.
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back toward the passenger's side when possible.
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use only the passenger's side mirror.
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use a helper whenever possible.
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17.
What is the most important reason to inspect your vehicle?
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Vehicle inspection is required by federal and state laws.
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Saving money by preventing costly repairs.
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Your safety and that of other road users.
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Achieving the best gas mileage.
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18.
If an aggressive driver is involved in an accident down the road, you should:
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make eye contact with the driver.
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try to get their vehicle to the side of the road.
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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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19.
Doubles and triples are:
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less likely to turn over than other combination vehicles.
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more stable than straight trucks.
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more likely to turn over than other combination vehicles because of the "crack-the-whip" effect.
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easier to drive than other combination vehicles.
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20.
An alcohol evaporator:
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is used to reduce the risk of ice in air brake valves and other parts during cold weather.
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used to reduce the chance of the front wheels skidding.
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protects the air brake system from too much pressure.
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to hold compressed air.
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