🚛CDL Doubles/Triples — Question 3 of 20
The converter dolly air tank drain valve on coupled double/triple trailers should be:
Answer: B
Closed
During the walk-around inspection and checking the coupling areas of a double/triple trailer, the converter dolly air tank drain valve should be closed.
All choices
- AOpen
- BClosed
- CPartially open
CDL Doubles/Triples Test Info
Questions on Exam
20
Passing Score
80%
Time Limit
Typically 30 minutes; varies by testing location
The Doubles/Triples test content is federally standardized, so this question applies in every state. Age limits, fees, and testing procedures do vary — check your state's CDL requirements.
Ready to pass your CDL Doubles/Triples exam?
Get full practice exams, study mode, and simulated tests with detailed explanations.
Risk-free — cancel anytime, no charge until trial ends.
Study this on the go
More CDL Doubles/Triples Practice Questions
- Which of these statements about the handling of doubles and triples is true?
- Which trailer is most affected by the crack-the-whip, resulting in a rollover?
- Which statement is true regarding the coupling of a triple?
- Before you can supply air to the air tanks of a second trailer you need to:
- When driving a truck with more than one trailer, which trailer should be first behind the truck?