OK CDL COMBINATION TEST - PRACTICE TEST
11.
Which of the following is true about the trailer hand valve?
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It should be used only to test the trailer brakes.
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The trailer hand valve works the trailer brakes.
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All of the above.
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12.
When approaching a stopped bus, you must be aware that:
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a student may be driving the bus.
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passengers may cross in front of or behind the bus.
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passing a stopped bus is illegal.
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13.
The first thing to do when coupling a tractor-semitrailer is to:
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check the trailer height.
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lock the trailer brakes.
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inspect the fifth wheel.
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14.
A bridge formula permits less maximum axle weight for axles that:
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have a high center of gravity
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are closer together
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are further apart than normal
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15.
You should always try to back toward the driver's side because:
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backing toward the left side is more dangerous.
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you can watch the rear of your vehicle out the side window.
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None of the above.
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16.
You supply air to the trailer brake system by:
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plugging the electrical cord into the trailer.
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connecting the tractor service air line to the trailer service glad hand.
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pushing in the trailer air supply knob.
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17.
If the drive wheels start to skid:
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push in the clutch to let them turn freely.
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accelerate slightly to regain control.
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use the brakes to slow down.
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18.
Which of the following may have reduced the clearances since the heights were posted at bridges and overpasses?
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The weight of a cargo
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Rain
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Repaving of the road
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19.
When more cargo is piled up in a truck, the truck becomes easier to turn over. Fully loaded rigs are _________ to roll over in a crash than empty rigs.
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three times more likely
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ten times more likely
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five times more likely
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20.
Which of the following is NOT part of the procedure to stop a trailer skid?
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Recognizing the skid
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Not using the hand brake
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Using the trailer hand brake to get traction back
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