WA CDL COMBINATION PRACTICE TEST
11.
When uncoupling, after you unlock the fifth-wheel you should:
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chock the trailer wheels.
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pull the tractor partially clear of the trailer.
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ease the pressure on the locking jaws.
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12.
When checking the air and electric lines to the trailer, be sure that the air lines are properly connected to the gland hands, and are:
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secured with enough slack for turns.
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secured with enough air leaks for turns.
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properly greased.
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13.
The wheels of a large combination vehicle are more likely to lock up when:
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the vehicle is lightly loaded.
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the vehicle is heavily loaded.
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the trailer has new tires.
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14.
When driving a combination vehicle, which of the following 2 things will help you prevent a rollover?
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Keeping cargo near the center of the vehicle and driving slowly on the highway.
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Keeping cargo near the center of the vehicle and driving slowly on turns.
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Keeping the cargo near the ground and driving slowly around turns.
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15.
When transporting cargo, the cargo should be checked:
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before the trip and after the first 150 miles.
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before the trip and after the first 50 miles.
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only before the trip.
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16.
During a walk around inspection of a combination vehicle, drivers should check that:
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the glide plate is securely mounted to the trailer frame.
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all locking pins are present and locked in place.
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All of the above.
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17.
If you cannot make a right turn without entering another traffic lane, you should:
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swing wide to the left before starting the turn.
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turn wide as you complete the turn.
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turn wide before you start the turn.
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18.
If you must make an emergency stop, you should:
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use the hand brake before the brake pedal.
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brake in a way that will keep your vehicle in a straight line.
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apply the brakes as hard as you can to lock them.
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19.
To test the service brake:
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push the brake pedal firmly while going about 5 mph.
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shift your transmission to a low gear, pump the brake pedal three times, then hold it down for five seconds.
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gently try to pull forward with the trailer parking brake on, then release the brake.
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20.
In a vehicle with a dual air brake system:
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both systems typically operate the regular brakes on the rear axle.
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each system has its own air tanks.
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one system supplies air to the trailer.
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