CDL GENERAL KNOWLEDGE TEST (SOUTH CAROLINA) - PRACTICE TEST
31.
The safety valve is usually set to open at:
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75 psi.
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200 psi.
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100 psi.
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150 psi.
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32.
To make the brakes work, air brakes use:
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compressed air.
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hydraulic air.
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nitrogen.
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carbon monoxide.
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33.
If you must stop on or by a one-way or divided highway, where should you place the three reflective triangles?
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100 feet and 200 feet toward the approaching traffic, and 10 feet in front of the vehicle.
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10 feet, 100 feet, and 200 feet toward the approaching traffic.
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10 feet, 100 feet, and 200 feet in front of the vehicle.
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10 feet and 100 feet toward the approaching traffic, and 200 feet in front of the vehicle.
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34.
If the drive wheels begin to spin, you should:
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take your foot off the accelerator.
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accelerate smoothly and change gears as necessary.
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apply your brakes all the way.
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wait 4-5 seconds before applying the accelerator.
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35.
Fully loaded rigs:
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are less likely to roll over than empty rigs.
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are just as likely to roll over as empty rigs.
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are much more likely to roll over than empty rigs.
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None of the above.
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36.
When you discover a fire, if the trailer doors are hot you should not open them because:
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with air many fires do less damage.
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you should use the fire extinguisher on the door.
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opening the doors lets air in and may make the fire flare up.
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the temperature of the trailer should not be changed in any way.
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37.
Air tank drains:
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are used to move air to the brakes.
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are used to remove water and oil from the air tanks.
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protect the tanks and the rest of the system from too much pressure.
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should not be used in wet weather.
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38.
When driving in heavy traffic, the safest speed is:
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slower than the speed of other traffic.
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the speed of traffic.
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the posted speed limit.
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slightly higher than the speed of other traffic.
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39.
Which of these should you check before driving in winter?
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Windshield wiper blades
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Coolant level and antifreeze amount
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Defrosters
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All of the above.
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40.
Which of the following is a good way to avoid becoming an aggressive driver?
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Be realistic about your travel time.
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Avoid talking on your cell phone.
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Keep your following distance reasonable.
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All of the above.
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