CDL COMBINATION PRACTICE TEST (AR)
11.
When going down grades, you should:
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put the transmission in Neutral.
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rely solely on engine braking to reduce your speed.
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shift up.
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downshift to a lower gear.
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12.
If your vehicle thumps or vibrates heavily, it may be a sign that:
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the engine belt is loose.
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you need to shift up.
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one of the tires has gone flat.
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the brakes have failed.
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13.
Anti-lock brakes:
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help you stop faster.
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increase your stopping distance.
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keep your brakes from locking up when you brake hard.
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reduce the perception distance.
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14.
To prevent rollover, you should:
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keep the cargo as close to the ground as possible.
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drive slowly around on ramps and off ramps.
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go slowly around turns.
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All of the above.
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15.
You are driving a modern truck with a manual transmission. When going down a hill you should usually:
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downshift after your
speed has already built up.
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shift into neutral and coast.
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use a lower gear than would be required to go up the hill.
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use the same gear you would use to go up the hill.
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16.
Blocking _______________ to keep it from sliding.
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is used only in the back of a piece of cargo
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goes from the upper part of the cargo to the floor
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is used in the front, back, and/or sides of a piece of cargo
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None of the above.
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17.
When coupling a tractor to a semi-trailer, after checking if the fifth-wheel is in proper position for coupling you should:
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make sure the area around the vehicle is clear and the trailer wheels are chocked.
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connect the air lines to the trailer.
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connect the electrical cord and check the air lines.
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secure the vehicle.
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18.
What is a tractor jackknife?
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When a drive-wheel skid lets the trailer push the towing vehicle sideways.
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When the wheels of a trailer lock up, and the trailer swings around.
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When the rear wheels of a trailer lock up, and the tractor swings around.
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None of the above.
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19.
You should not use the trailer hand brake to straighten out a jackknifing trailer. Why?
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The brakes on the trailer wheels will not respond.
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You should use the emergency break instead.
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The brakes on the trailer wheels caused the skid in the first place.
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You should use the service break instead.
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20.
If the drive wheels begin to spin when accelerating, you should:
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continue to accelerate.
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brake gently.
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take your foot off the accelerator.
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set the parking brake.
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