CDL DOUBLES TRIPLES PRACTICE TEST COLORADO
11.
Texting while operating a commercial motor vehicle is:
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illegal.
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only allowed at night.
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acceptable if you are contacting your dispacther.
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acceptable if you are contacting your supervisor.
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12.
Under a pressurized system, the radiator cap:
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should always be cool.
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should never be hot.
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should never be removed until the system has cooled.
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should be removed when the coolant is hot.
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13.
You can release dolly brakes:
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by closing the emergency line valve.
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by opening the service line valve.
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by opening the air tank petcock.
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by closing the air tank petcock.
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14.
When making a turn you should:
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honk your horn.
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make gestures to get the attention of other drivers.
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signal early.
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turn the signal off before entering the turn.
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15.
Empty trucks require _____ stopping distances because empty vehicles have ______ traction.
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less; more
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greater; less
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greater; more
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less; less
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16.
The tractor protection valve:
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prevents the trailer from being accidentally released.
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keeps air from going out if the air compressor develops a leak.
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keeps air in the brake system should the trailer develop a bad leak.
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keeps your wheels from locking up when you brake hard.
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17.
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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the locking jaws are around the shank.
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All of the above.
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18.
When driving a double or triple, you should:
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increase your following distance.
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drive in the left lane whenever possible.
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drive with emergency flashers on.
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decrease your following distance.
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19.
Placards must be at least _____ inches square.
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9.84
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12.6
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5
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21.2
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20.
When inspecting the coupling, make sure the fifth-wheel jaws have closed around the:
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shank of the kingpin.
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the electrical cord.
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the brake camshaft.
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head of the kingpin.
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