DOUBLES TRIPLES TEST DC - CDL PRACTICE TEST
11.
If you unlock the pintle hook with the dolly still under the rear trailer:
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steam and boiling water can spray under pressure.
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your vehicle might roll away.
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the brakes could be damaged by the combined forces of the springs and the air pressure.
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the dolly tow bar may fly up.
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12.
During a walk around inspection of a double or triple trailer, make sure that the converter dolly air tank drain valve is _____ and the glad hands are ______.
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open; properly connected
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closed; properly connected
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open; not connected
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closed; not connected
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13.
For safe handling, the heaviest trailer should be:
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behind the tractor.
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the second trailer in a triple.
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the last trailer.
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None of the above.
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14.
Glad hands are:
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warning devices.
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electronic devices.
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coupling devices.
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securement devices.
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15.
If a tire fails while you are driving, you should:
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stop on the roadway if possible.
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brake as hard as possible.
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call your supervisor for instructions.
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stay off the brake
until your vehicle has slowed down.
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16.
Right after it starts to rain, the road is very slippery. Why?
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Because black ice may form on the road.
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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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None of the above.
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17.
How should you apply the brakes when going down a steep downgrade?
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Apply the brakes whenever you reach your safe speed, until your speed has been reduced to 5 mph below your safe speed.
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Apply the brakes as hard as you can without locking the wheels.
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You should not brake, and only use engine braking to prevent brake failure.
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Apply the brakes when you reach the bottom of the downgrade.
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18.
While crossing railroad tracks, you should:
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shift up.
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stop, then look and listen for the train.
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not shift gears.
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shift down.
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19.
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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the effect won't be noticeable for the first 50 miles.
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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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20.
When the wheels of a trailer lock up, which of the following is most likely to occur?
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The trailer will the trailer
has overturn.
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The trailer will tend to push the towing vehicle sideways (tractor jackknife).
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The trailer will tend to swing around (trailer jackknife).
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The rig will stay in a straight line but slide sideways.
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