🚛CDL Doubles/Triples — Question 14 of 20
How are the spring brakes for a converter dolly released?
Answer: B
With the dolly parking brake control
The dolly parking brake control is used to release the spring brakes of a converter dolly.
All choices
- AOpening the air tank petcock
- BWith the dolly parking brake control
- CPressing the trailer air supply control knob in
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.
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More CDL Doubles/Triples Practice Questions
- What is likely to happen if the pintle hook is unlocked with the dolly still under the second trailer?
- You should check trailer height before connecting a converted dolly to a second or third trailer. The trailer height is right when:
- Which of these statements about quick steering movements and doubles/triples is true?
- You are driving with double trailers and must use your brakes to avoid a crash. For emergency braking you should:
- With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. When you do this, you should hear: