CDL Doubles and Triples Test Question and Answers

CDL Doubles and Triples Test Question and Answers 2024 [PDF]: Commercial Driver’s License Doubles and Triples Endorsements Knowledge Test. Try our free CDL Doubles and Triples Test Question and Answers Quiz online.

Take special care when pulling two and three trailers. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles. You will not be tested on uncoupling twins unless you want to get a double/triple trailer endorsement on your license.

CDL Doubles and Triples Test Question and Answers 2024 [PDF]

CDL Doubles and Triples Test Question and Answers

Test Name CDL Practice Test 2024
Language English
License Endorsements Permit
Total Questions 30 MCQs
Test For Commercial Driver License
Test Preparation Doubles and Triples Endorsements
Country USA
Explanation No
0%
0 votes, 0 avg
4

CDL Doubles/Triples Test

1 / 30

You are driving a triple trailer and there is a loss of air pressure in the emergency line. Which of the following will occur?

2 / 30

While inspecting your converter dolly coupling, you should make sure there is _______ between the upper and lower fifth wheel.

3 / 30

_______ should be tested with the hand valve but controlled in normal operation with the foot pedal.

4 / 30

Which of the following will probably happen if you are driving a double rig and a set of trailer wheels goes into a skid?

5 / 30

What is one function of the tractor protection valve?

6 / 30

The braking systems of double and triple trailers are different than those of straight trucks because doubles and triples

7 / 30

Which of the following must be connected when coupling tractor to trailer or trailer to trailer?

8 / 30

What is most likely to happen if the trailer protection valve of a double or triple trailer does not function correctly?

9 / 30

When coupling twin trailers, you should _______ the pintle hook and secure the dolly support in the _______ position.

10 / 30

Converter dollies often do not have

11 / 30

You are driving with more than one trailer. Which trailer should come first behind the tractor?

12 / 30

When doing a walkaround inspection of a double or triple trailer, the shut-off valves should be _______ at the rear(s) of the front trailer(s) and ________ at the rear of the last trailer.

13 / 30

During a jackknife, it is best to

14 / 30

When turning a double or triple at an intersection, the turn often cannot be completed without swinging wide. Which diagram shows the best way to turn?

15 / 30

When checking the coupling system, make sure that the locking jaws are around the shank of the

16 / 30

It is important to check the height of the trailer before connecting a converter dolly to a trailer. The trailer is at the correct height when

17 / 30

In double and triple trailers, the trailer air supply control should pop or _________ when air pressure drops into the range of 20 to 45 psi.

18 / 30

When coupling twin trailers, a converter dolly is

19 / 30

If you are driving a 200-foot triple at 35 mph, what is the minimum amount of space (in seconds) that you should keep ahead of you?

20 / 30

The pintle hook plays a part in

21 / 30

When driving a double or triple trailer, greater care must be given to

22 / 30

You open the emergency line shut-off valve at the rear of the last trailer and hear air escaping. This means

23 / 30

Which of the following is true about loading cargo into double or triple trailers?

24 / 30

Trucks with trailers have a dangerous “crack-the-whip” effect. Because of this, which of the following vehicle parts is most likely to tip over?

25 / 30

While doing a walkaround inspection of a double or triple, the converter dolly air tank drain valve should be _______, and the pintle hook should be _______.

26 / 30

When you are pulling trailers, which of the following statements is true about steering?

27 / 30

You are driving a tractor with multiple trailers. Which of the following statements about off tracking is true?

28 / 30

Trucks that are empty or lightly loaded

29 / 30

When uncoupling, you should never unlock the _______ with the dolly still under the rear trailer.

30 / 30

In order to supply air to the air tanks of a second trailer, you must ______ shut-off valves at the rear of the first trailer and ________ the shut-off valves at the rear of the second trailer.

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The average score is 64%