# Free Florida CDL Combination Vehicles Practice Test 2023

Our CDL practice tests:
Based on 2021 FL commercial driver's license manual
Perfect for first-time, renewal applicants
FL CDL Combination Vehicles Test format:
20 questions
80% passing score
List of questions
1.
The likelihood of a fully loaded rig turning over compared to an empty trailer is:
2.
When inspecting the coupling area, all of the following are required, EXCEPT:
3.
When you open the emergency shut-off valve at the back of the last trailer after supplying air to trailer(s):
4.
For proper hose coupling, lines are often color-coded. Service lines are usually:
5.
A function of the tractor protection valve is:
6.
Supplied by the service line from the tractor, each trailer or dolly has its own:
7.
Compared to a straight truck or bus, there are ______ things to inspect in combination vehicles.
8.
There are two things that a driver can do to prevent a rollover. They are: (1) keep the cargo as close to the ground as possible and (2):
9.
When you get ready to back under a semitrailer you should line up:
10.
To make coupling and uncoupling a loaded trailer easier:
11.
Rearward amplification is a major cause of:
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.
Which of these statements is true?
14.
Your emergency air line breaks or gets pulled apart while you are driving. The loss of pressure will cause the:
15.
When should you use the hand valve to park a combination vehicle?
16.
When you notice that your trailer has lost traction and is going into a skid, you should:
17.
Crack-the-whip effect occurs when:
18.
The "rearward amplification" value means _______.
19.
Air and electrical lines from the tractor to the trailer should be:
20.
At the back of trailer used to tow other trailers are shut-off valves, also called: