Free Oklahoma CDL Combination Vehicles Practice Test 2022

You have to pass the Oklahoma CDL combination vehicles endorsement to get ready for propelling your career with your license. You are looking for a good Oklahoma CDL Practice Test source for your coming CDL test? You are in the right place. Our practice test is a great resource for beginners. The test is designed for you to have exactly the experience of the exam as you will be more familiar with both the test format and the subject. Our CDL practice test covers topics ranging from combination vehicle maintenance to safely driving a complex rig. Each question is based on the official Oklahoma CDL Manual so you can be sure that the information in our test is accurate and relevant to your examination. In addition, each question has a detailed explanation so that it is very useful for you to learn from your mistakes. Preparing well before test day with questions and content that we cover. Start with our Free Oklahoma CDL Combination Vehicles Practice Test today and walk out with your endorsement!

Our CDL practice tests:
Based on 2022 OK commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
OK CDL Combination Vehicles Test format:
20 questions
16 correct answers to pass
80% passing score
List of questions
1.
Semi-trailers made before 1975 that are equipped with air brakes:
2.
The air lines on a combination vehicle are often colored to prevent them from mixing up. The emergency line is _____, the service line is _________.
3.
How much space should be allowed between the upper and lower fifth wheel after coupling?
4.
The air leakage rate for a combination vehicle (engine off, brakes on) should not be more than _____ psi per minute.
5.
Hose couplers are also referred to as:
6.
If your trailer goes into a skid, you should do all of the following except:
7.
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):
8.
Which part of the kingpin should the locking jaw close around?
9.
The trailer hand valve should be used:
10.
When checking the trailer emergency brakes, the tractor protection control valve should be placed in what position?
11.
Trailers will have an ABS malfunction lamp:
12.
To test the trailer brakes before driving, use the hand valve or the:
13.
You are about to back your tractor under a semitrailer. The trailer is at the right height when the:
14.
Driving with an empty trailer:
15.
The "rearward amplification" value means:
16.
After you have coupled the trailer you should raise the landing gear by using:
17.
You supply air to the trailer tanks by:
18.
After connecting the air lines but before backing under the trailer you should:
19.
When backing under the trailer, do all of the following except:
20.
At the back of trailer used to tow other trailers are shut-off valves, also called: