GENERAL KNOWLEDGE CDL TEST SOUTH DAKOTA - PRACTICE TEST
11.
Alcohol:
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does not affect judgement.
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improves reaction time.
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improves muscle coordination.
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impairs depth perception.
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12.
Brake lag is:
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the distance your vehicle will continue to travel, in ideal conditions, before you hit the brakes.
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the distance your vehicle will travel, in ideal conditions, while you are braking.
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the amount of air pressure required to stop the vehicle.
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the time required for the air brakes to work after the brake pedal is pushed.
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13.
On engine start, you should:
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make sure the oil pressure gauge is working.
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check that the master cylinder is securely attached and not leaking.
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check the oil level.
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check for minimum tread depth.
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14.
What should you do if your vehicle starts hydroplaning?
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Accelerate slightly, then push in the clutch to slow down.
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Release the accelerator and push in the clutch to let the wheels turn freely.
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Apply the brakes and countersteer to regain control of the vehicle.
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Leave the road completely.
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15.
An Anti-lock Braking System (ABS):
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always shortens your stopping distance.
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keeps your wheels from locking up when you brake hard.
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increases your normal braking capability.
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lets you drive faster.
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16.
When using the controlled braking method, you:
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repeatedly tap the brakes as fast as you can.
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apply the brakes all the way and release brakes when wheels lock up.
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apply the brakes as hard as you can without locking the wheels.
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lightly apply braking pressure.
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17.
You should be especially alert for drunk drivers:
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in the morning.
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in the early evening.
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late at night.
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around shopping areas.
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18.
As you approach a turn, do not coast unsafely. Unsafe coasting occurs when:
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your vehicle is out of gear for more than the length of your vehicle.
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you downshift before making a turn.
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you don't use turn signals before making a turn.
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you downshift for less than the length of your vehicle.
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19.
Use your four-way emergency flashers:
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to warn drivers behind you that people are working on the road.
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when parked at the side of the road.
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when stopping at railroad highway crossings.
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All of the above.
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20.
Texting while operating a commercial motor vehicle is:
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illegal.
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acceptable if you are contacting your dispacther.
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only allowed at night.
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acceptable if you are contacting your supervisor.
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