ILLINOIS DOUBLES TRIPLES PRACTICE CDL TEST
11.
The weight of a truck:
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is not as important as the vehicle's center of gravity in determining stopping distance.
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has no effect on stopping distance.
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has an impact on stopping distance.
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None of the above.
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12.
Which of the following is NOT correct? Anti-lock brakes:
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help drivers avoid wheel lock up.
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give drivers more control over the vehicle during braking.
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require drivers to apply the brakes as hard as they can without locking the wheels.
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help drivers avoid skids caused by over braking.
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13.
To make the brakes work, air brakes use:
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hydraulic air.
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compressed air.
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nitrogen.
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carbon monoxide.
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14.
Empty trucks require _____ stopping distances because empty vehicles have ______ traction.
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greater; more
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less; more
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greater; less
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less; less
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15.
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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1/16 inch
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16.
If your vehicle has air brakes, the trailer air supply knob will pop out when the air pressure drops into the range of:
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50 to 70 psi
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5 to 10 psi
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10 to 20 psi
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20 to 45 psi
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17.
If there is a fire and you are not sure what to use to put it out, you should:
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use water.
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wait for firefighters.
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use a fire extinguisher.
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use dry powder.
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18.
If you must drive slowly, how should you alert following drivers?
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Flash your brake lights
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Help them out by signaling when it is safe to pass
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Use your emergency flashers if it is legal
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Turn on your taillights
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19.
Most heavy duty vehicles use ___ air brake systems for safety.
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dual
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single
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triple
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reduced
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20.
When coupling, you should:
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make sure the trailer wheels are not chocked.
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be aware that wrong coupling and uncoupling can be very dangerous.
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make sure the sliding fifth-wheel is locked.
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make sure the trailer kingpin is bent.
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