CDL COMBINATION PRACTICE TEST (IN)
11.
You must have at least 4/32 inch tread depth in every major groove on front tires and at least ___ inch on other tires.
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4/32
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1/32
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3/32
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2/32
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12.
If the safety relief valve in the air brake system releases air:
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something is wrong.
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this will supply more power to the drive wheels.
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the valve is fully operational.
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this will supply more power to the brakes.
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13.
To prevent rollover, drivers of combination vehicles should:
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keep the load is to one side.
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keep the cargo as close to the ground as possible.
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brake while turning.
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make sure the cargo is not centered and spread out.
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14.
Brake fade results from, and is affected by:
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excessive heat caused by using the brakes too much.
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brakes out of adjustment.
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excessive heat caused by not relying on the engine braking effect.
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All of the above.
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15.
When checking air brakes on combination vehicles, which of the following is NOT part of checking that air flows to all trailers?
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Opening the emergency line shut-off valve at the rear of the last trailer.
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Going to the rear of the rig.
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Using the trailer handbrake to provide air to the service line.
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Pulling tractor forward until the fifth-wheel comes out from under the trailer.
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16.
When driving on slippery roads, you should NOT:
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go slowly.
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use the engine brake.
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try to anticipate stops early.
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watch far enough ahead to keep a steady speed.
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17.
How can you tell if a converter dollie has ABS?
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There is a red lamp on the left side of the dolly.
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There is a yellow lamp on the left side of the dolly.
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There is an ABS plaque on the right side of the dolly.
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There is an ABS system on the right side of the dolly.
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18.
What is a pull up when referring to truck driving?
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Using the speedometer to know when to shift up.
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A specific maneuver used to decelerate smoothly in the exit lane.
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When a driver stops and pulls forward to get a better position.
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A driving maneuver used to pull your vehicle over to the side of the road and stop.
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19.
Loose cargo:
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could hurt or kill you during a quick stop.
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can be a danger to others and yourself.
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could fall off your vehicle and cause traffic problems.
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All of the above.
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20.
You are coupling a tractor to a semi-trailer. After checking the trailer height but before supplying air to the trailer, you should:
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raise the front trailer supports.
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inspect the fifth-wheel.
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connect the air lines to the trailer.
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lock the trailer brakes.
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