CDL COMBINATION PRACTICE TEST KENTUCKY
11.
Inspecting the fifth-wheel does NOT include:
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checking for missing or damaged parts.
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making sure that the fifth wheel is in the proper position for coupling.
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checking that there are no cracks in the frame.
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backing until the fifth-wheel just touches the trailer.
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12.
When you are driving on a slippery road, you should NOT:
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use the engine brake or speed retarder.
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adjust turning and braking to road conditions.
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keep a longer following distance.
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take curves at slower speeds.
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13.
Empty trucks have the best braking. True or False?
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It depends on the truck.
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True.
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False.
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It depends on the cargo.
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14.
What is the emergency air line for?
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It controls the front brakes of the tractor in case of an emergency.
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It supplies air to the trailer air tanks, and controls the emergency brakes on combination vehicles.
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It tells you the amount of brake pressure you need to stop the vehicle.
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All of the above.
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15.
If you try to couple when the trailer is too low:
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the tractor may strike and damage the trailer nose.
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the tractor could roll away.
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it might not couple correctly.
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All of the above.
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16.
A high center of gravity means:
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you are more likely to tip over.
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the spring brakes will come fully on.
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a rollover is less likely.
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you'll have better traction.
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17.
Before driving a vehicle with a dual air brake system, you should allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
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100 psi
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35 psi
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50 psi
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150 psi
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18.
When uncoupling a trailer, after shutting off the trailer air supply to lock the trailer brakes, you should:
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inspect the trailer supports.
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back up gently to ease the pressure on the fifth-wheel locking jaws.
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pull the tractor forward until the fifth-wheel comes out from under the trailer.
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immediately apply your tractor parking brakes.
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19.
Longer combination vehicles have the tendency to swing wide on turns. This is called:
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hydroplaning.
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jackknifing.
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rollover.
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off-tracking.
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20.
How many red reflective triangles should you carry?
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3
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6
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2
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5
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