WY CDL DOUBLES TRIPLES TEST - PRACTICE TEST
11.
Retarders:
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reduce braking distance.
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reduce the danger of slipping.
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help slow a vehicle, reducing the need for using brakes.
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improve gas mileage.
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12.
When the wheels of a trailer lock up:
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the vehicle will gradually come to a complete stop.
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the trailer will tend to swing around.
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ABS will increase stopping power.
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All of the above.
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13.
If the drive wheels begin to spin, you should:
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apply your brakes all the way.
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take your foot off the accelerator.
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accelerate smoothly and change gears as necessary.
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wait 4-5 seconds before applying the accelerator.
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14.
What is the minimum tread depth for tires other than front tires?
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2/32 inch
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8/32 inch
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4/32 inch
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4/16 inch
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15.
Which of the following is a common cause of truck fires?
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Under-inflated tires and duals that touch.
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Short circuits due to loose connections.
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loose fuel connections.
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All of the above.
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16.
If you cannot make a right turn without entering another traffic lane, you should:
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watch out for vehicles coming toward you and back up for them.
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turn wide as you complete the turn.
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swing wide to the left before starting the turn.
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turn wide before you start the turn.
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17.
Because of the "crack-the-whip" effect, doubles and triples:
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can go much faster than other combination vehicles.
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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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are much slower than other combination vehicles.
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18.
If there is a fire in your vehicle, do NOT:
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park in an open area.
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notify emergency services.
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park away from buildings and other vehicles.
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pull into a service station.
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19.
When a combination vehicle goes around a corner:
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the driver must keep the rear of your vehicle far away from the curb.
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the rear wheels of the trailer will never off-track.
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the front and rear wheels follow a different path.
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All of the above.
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20.
In a dual air brake system, if one air system is very low on pressure:
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you should pump the brakes to restore pressure.
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you should drive and brake as you always have.
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either the front or rear brakes will not be operating fully.
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the effect won't be noticeable for the first 50 miles.
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