IOWA DOUBLES TRIPLES PRACTICE CDL TEST
11.
When coupling double trailers, if the second trailer does not have spring brakes, to set the trailer emergency brakes you should:
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1. Connect the emergency line 2. Drive the tractor close to the trailer 3. Disconnect the emergency line 4. Charge the trailer air tank.
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1. Drive the tractor close to the trailer 2. Connect the emergency line 3. Charge the trailer air tank 4. Disconnect the emergency line.
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1. Disconnect the emergency line 2. Drive the tractor close to the trailer 3. Charge the trailer air tank 4. Connect the emergency line.
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12.
Retarders:
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reduce braking distance.
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help slow a vehicle, reducing the need for using brakes.
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improve gas mileage.
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13.
On any upgrade, _________ – the more you will have to use lower gears to climb hills or mountains.
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the steeper the grade
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the longer the grade
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All of the above.
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14.
Before operating the vehicle, the driver should:
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should not review the vehicle inspection report and immediately try to find any vehicle defects.
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review the last vehicle inspection report.
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rely on the last vehicle inspection and skip the pre-trip inspection.
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15.
Doubles/triples are:
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easier to drive than other CMVs.
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usually faster than most CMVs.
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less stable than other CMVs.
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16.
When driving in extremely hot weather, if the air pressure in the tires is too high, you should:
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continue driving.
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let air out of the tires to decrease pressure.
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stop and remain stopped until the tires cool off.
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17.
The best way to recognize that your trailer has started to skid is:
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by recognizing tire failure.
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by feeling the brakes come on.
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by seeing it in your mirrors.
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18.
In newer vehicles with air brakes, you put on the parking brake:
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using a diamond-shaped, yellow, push-pull control knob.
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placing the transmission in Park.
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using a P-shaped, yellow control knob.
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19.
A low air pressure warning signal:
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is required on vehicles with air brakes.
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is required on all vehicles without air brakes.
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is optional on vehicles with air brakes.
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20.
In a combination vehicle, ________ is most likely to turn over.
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the last trailer
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the trailer behind the tractor
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the tractor
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