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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Iowa CDL combination test consists of 20 questions, and you'll need at least 16 correct answers to pass (80%). The test covers the combination vehicles section of the Iowa CDL Manual. Take this practice test now to prepare for the actual IA CDL combination test!
1. If you have a manual transmission, when stopping don't _______ until the engine rpm is down close to idle.
shift to second gear
push the clutch in
place the transmission in park
2. ABS:
should only be used on dry roads.
is an addition to your normal brakes.
allows you to brake harder.
3. When transporting cargo, drivers must inspect the securement of the cargo every:
150 miles
30 miles
300 miles
4. Before transporting sealed loads, you should check:
that you don't exceed gross weight and axle weight limits.
a small sample of whatever is inside.
the special transit permit.
5. After a tire has been changed, the driver should stop a short while later to:
check the tightness of the nuts.
deflate the tire to 10 psi.
decrease tire pressure.
6. Inspecting the fifth-wheel does NOT include:
ensuring the fifth wheel is in the proper position for coupling.
making sure that the fifth-wheel plate is greased as required.
checking the area around the vehicle.
7. Over-length loads:
may require special equipment such as "wide load" or flags.
require special transit permits.
All of the above.
8. When the wheels of a trailer lock up, the trailer will tend to swing around. This is more likely to happen when:
the trailer is empty or lightly loaded.
the trailer is fully loaded.
the trailer is overloaded.
9. When a vehicle goes around a corner, the rear wheels:
follow a different path than the front wheels.
follow the same path as the front wheels.
will turn freely.
10. To prevent a rollover, you should keep the cargo as close to the ground as possible and:
keep the vents clear so they work correctly.
keep an eye on your tires.
go slowly around turns.
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IA CDL Combination Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
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