CDL DOUBLES TRIPLES PRACTICE TEST IOWA
11.
Why should you back toward the driver's side?
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You can see better and watch the rear of your vehicle by looking out the side window.
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You can more easily correct any steering errors.
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All of the above.
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12.
To warn drivers behind you when you see you'll need to slow down, you should:
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flash the brake lights.
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sound your horn.
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use your headlights.
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13.
When the wheels of a trailer lock up, which of the following is most likely to occur?
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The trailer will the trailer
has overturn.
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The trailer will tend to swing around (trailer jackknife).
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The trailer will tend to push the towing vehicle sideways (tractor jackknife).
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14.
To know how much space you should keep in front of you when driving at speeds below 40 mph, one good rule says you need at least ______ for each ______ of vehicle length.
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1 second; 5 feet
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2 seconds; 10 feet
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1 second; 10 feet
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15.
Which of the following is not a braking system on a truck?
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Steering brake
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Parking brake
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Service brake
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16.
If your brakes fail on a steep mountain downgrade, you should:
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use an escape ramp if it is available.
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go right if the shoulder is clear.
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leave the road immediately.
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17.
Most heavy-duty vehicles use:
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solid brakes.
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air brakes.
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hydraulic brakes.
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18.
Which of the following road surfaces freezes first?
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Bridges
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Underpasses
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Open roads
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19.
The trailer hand valve should be used:
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to check that the trailer is locked onto the tractor.
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to check that the trailer emergency brakes are on.
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to test the trailer brakes.
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20.
To start moving without rolling back, you should:
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put on the parking brake whenever necessary.
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partly engage the clutch before you take your right foot off the brake.
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All of the above.
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