CDL DOUBLES PRACTICE TEST IOWA
11.
If a tire fails while you are driving, you should:
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call your supervisor for instructions.
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stay off the brake
until your vehicle has slowed down.
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stop on the roadway if possible.
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12.
If you experience a loss of hydraulic pressure, you should do all of the following except:
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Pump the brakes
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Put the transmission in Neutral
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Downshift
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13.
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 trailer emergency brakes will come on.
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the tractor will lose all air pressure.
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14.
If you are carrying a heavy load that is slowing you down, you should:
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drive in the left lane.
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drive on the shoulder.
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drive in the right lane.
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15.
To prevent rollover, you should do all of the following except:
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put the lightest parts of the cargo under the heaviest parts.
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drive slowly around turns.
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keep the load centered on your rig.
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16.
When a combination vehicle goes around a corner:
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the rear wheels of the trailer will never off-track.
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the front and rear wheels follow a different path.
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the driver must keep the rear of your vehicle far away from the curb.
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17.
After the pre-trip inspection, drivers should inspect their cargo and its securing devices again within ________ after beginning the trip.
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50 miles
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25 miles
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20 miles
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18.
Alcohol:
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does not affect judgement.
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impairs depth perception.
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improves reaction time.
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19.
When backing, you should:
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back quickly.
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only use mirror on the driver's side.
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use the mirrors on both sides.
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20.
If your vehicle is equipped with air brakes, loss of air pressure in the emergency line will cause:
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the trailer emergency brakes to come on.
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the vehicle to slide back and forth.
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the springs to put on the brakes.
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