CDL Doubles Practice Test Washington
11.
On front tires, tread should be at least:
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4/16 inch
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2/32 inch
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4/32 inch
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12.
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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13.
Which of the following vehicles is most likely to turn over?
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65 ft. conventional double
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Triple trailer
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3 axle tractor semitrailer
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14.
The trailer hand valve should:
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never be used to test the trailer brakes.
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never be used for parking.
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be used in driving.
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15.
Off-tracking is:
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when a vehicle towing a trailer skids, and the trailer pushes the towing vehicle from behind until it spins the vehicle around.
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when the tires lose their contact with the road and have little or no traction.
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when a vehicle makes a turn and the rear wheels of the trailer end up driving in a different path than the tractor and the front wheels of the trailer.
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16.
To prevent getting sleepy while driving, you should:
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keep cool by opening the window.
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drive alone whenever possible.
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keep the cab warm.
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17.
For safety during a trip, you should:
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check critical items when you stop.
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watch gauges for signs of trouble.
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All of the above.
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18.
To use the controlled braking method in an emergency, you should:
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apply the brakes as hard as you can without locking the wheels.
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apply your brakes all the way, and release the brakes when the wheels lock up.
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apply the brakes when the wheels lock up.
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19.
After the pre-trip inspection, drivers should inspect their cargo and its securing devices again within ________ after beginning the trip.
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50 miles
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25 miles
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20 miles
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20.
When driving on slippery roads, you should NOT:
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try to anticipate stops early.
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use the engine brake.
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go slowly.
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