COMBINATION PRACTICE TEST - CT CDL
11.
Overloading can have negative effects on:
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speed control.
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braking.
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steering.
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All of the above.
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12.
If the drive wheels begin to spin when accelerating, you should:
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brake gently.
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set the parking brake.
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continue to accelerate.
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take your foot off the accelerator.
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13.
To test the tractor-semitrailer connection for security:
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pull out the air supply knob.
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go under the trailer and look into the back of the fifth-wheel.
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plug the electrical cord into the trailer and fasten the safety catch.
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check that the trailer is locked onto the tractor by pulling the tractor gently forward while the trailer brakes are still locked.
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14.
When backing a tractor under a trailer, you should:
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stop before when the kingpin is locked into the fifth wheel.
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always use the lowest reverse gear.
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back at an angle.
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All of the above.
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15.
When the trailer breaks away or develops a bad leak, the tractor protection valve will close automatically and:
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the trailer supply valve will stay open.
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the engine will shut down.
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the trailer emergency brakes will come on.
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the tractor will lose all air pressure.
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16.
You are checking the tractor-trailer connection to make sure it is safe and secure. The landing gear should be:
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fully raised.
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fully lowered.
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raised slightly off the ground.
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None of the above.
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17.
Which of the following is NOT part of the procedure to stop a trailer skid?
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Using the trailer hand brake to get traction back
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Releasing the brakes
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Recognizing the skid
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Not using the hand brake
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18.
If your vehicle has dummy couplers, why should you use them when the air lines are not connected to a trailer?
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To prevent freezing of the washer liquid.
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Because if you don't, you will never build system pressure.
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To prevent overheating.
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To prevent water and dirt from getting into the coupler and the air lines.
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19.
Older trailers do not have spring brakes. If the air supply leaks away:
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the ABS won't work properly.
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there will be no emergency brakes.
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the trailer will stop normally.
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All of the above.
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20.
When approaching a vehicle with a distracted driver, you should:
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quickly pass the vehicle.
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change lanes quickly.
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maintain your safe following distance.
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sound your horn.
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