This is the second of two different Doubles & Triples CDL practice tests that we offer. Please take all of our free practice tests to ensure that you score well on the big day! Driving Doubles & Triples is complicated and requires an extensive knowledge of your truck and the additional units!
Our free Doubles & Triples CDL practice test #2 contains 10 questions. You may not skip any of the questions. There is no time limit on the test. For maximum practice, we highly recommend taking each of our free CDL practice tests at least once.
Our CDL practice test database contains hundreds of questions. If you need more practice or want to improve your score, click the ‘Restart Quiz’ button at the end of the test. The questions will be presented in a different order but they’ll be the same questions you already answered. The second time around you should know the answers!
Doubles & Triples CDL Practice Test 2
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Question 1 of 10
Older vehicles may have a lever rather than a knob for the tractor protection valve. What the normal and emergency positions of the lever?CorrectIncorrect
Question 2 of 10
The valves on the service line on the trailer used to connect the trailer air tanks to the trailer air brakes are called __________.CorrectIncorrect
Question 3 of 10
One purpose of the emergency air line is to __________.CorrectIncorrect
Question 4 of 10
If there is a loss of pressure in the emergency line the trailer emergency brakes __________.CorrectIncorrect
Question 5 of 10
What happens to the tractor protection valve if the emergency line loses pressure?CorrectIncorrect
Question 6 of 10
Which lines are normally blue?CorrectIncorrect
Question 7 of 10
The tow seals are pressed together with the couplers at what kind of angle to connect the glad hands?CorrectIncorrect
Question 8 of 10
When you are not towing a trailer you should lock the glad hands to each other __________.CorrectIncorrect
Question 9 of 10
What should you do if the spring brakes don’t release when you push the trailer air supply control?CorrectIncorrect
Question 10 of 10
Which of the following statements is true?CorrectIncorrect