Free Arizona CDL Combination Vehicles Practice Test 2023

Our CDL practice tests:
Based on 2021 AZ commercial driver's license manual
Perfect for first-time, renewal applicants
AZ CDL Combination Vehicles Test format:
20 questions
80% passing score
List of questions
1.
The air lines on a combination vehicle are often colored to prevent them from mixing up. The emergency line is _____, the service line is _________.
2.
A tractor with a _______ trailer, requires the most amount of stopping distance.
3.
The trailer air supply control knob is _____.
4.
The higher the center of gravity of your truck, the:
5.
To unlock the fifth wheel, the locking lever should be placed in the ______ position.
6.
A function of the tractor protection valve is:
7.
Spring brakes are not required on trailers and dollies built before:
8.
The shut-off valves at the back of the last trailer should be:
9.
The tractor protection valve will close, and the trailer emergency brakes will come on when there is a major leak in the _____ brake line.
10.
The trailer service brakes should be tested with the hand control, and controlled during normal operation by:
11.
If you have to enter another traffic lane to complete a wide turn, you should:
12.
When driving a combination vehicle with multiple trailers or dollies, all air shut-off valves except the last one at the back must be:
13.
When checking the trailer emergency brakes, the tractor protection control valve should be placed in what position?
14.
Trailers will have an ABS malfunction lamp:
15.
The emergency air line is usually what color?
16.
When uncoupling, the tractor should:
17.
Crack-the-whip effect occurs when:
18.
Your emergency air line breaks or gets pulled apart while you are driving. The loss of pressure will cause the:
19.
The fifth wheel locking lever is not locked after the jaws close around the kingpin. This means that:
20.
Where should the tractor be when you inspect the landing gear after uncoupling the trailer?