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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Tennessee 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 Tennessee CDL Manual. Take this practice test now to prepare for the actual TN CDL combination test!
1. Enough tread is especially important in winter conditions. You need at least ________ tread depth on steering axle tires.
8/32 inch
6/24 inch
4/32 inch
2/8 inch
2. A red triangle with an orange center means:
Law enforcement vehicle
Liquid tanker
Slow-moving vehicle
The vehicle is hauling hazardous materials
3. If you're feeling tired while driving you should:
increase your speed to get to your destination quicker.
drink coffee.
stop driving and get some rest.
eat something.
4. You must have at least 4/32 inch tread depth in every major groove on front tires and at least ___ inch on other tires.
5. 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 overloaded.
the trailer is empty or lightly loaded.
the trailer is fully loaded.
None of the above.
6. If you unlock the pintle hook with the dolly still under the rear trailer:
the brakes could be damaged by the combined forces of the springs and the air pressure.
steam and boiling water can spray under pressure.
the dolly tow bar may fly up.
your vehicle might roll away.
7. When inspecting the coupling, make sure ________ between the upper and the lower fifth-wheel.
there are 10 feet
there are at least 36 inches
there is no space
there is at least 1 foot
8. You should always try to back toward the driver's side because:
you can watch the rear of your vehicle out the side window.
you can more easily correct any steering errors.
backing toward the left side is more dangerous.
None of the above.
9. When your vehicle goes around a corner, the rear wheels follow a different path than the front wheels. This is called:
front-rear tracking.
10. You are coupling a tractor to a semi-trailer. After checking the trailer height but before supplying air to the trailer, you should:
connect the air lines to the trailer.
lock the trailer brakes.
inspect the fifth-wheel.
raise the front trailer supports.
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TN CDL Combination Test

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