📚Alabama General Knowledge — Question 1 of 10
The purpose of the retarders is to:
Answer: B
Help slow the vehicle while driving and reduce brake wear.
Brake retarders may be of four types; engine, exhaust, hydraulic, or electrical. They are designed to reduce the speed of a vehicle similar to engine braking. This prolongs the life of the service brake components that are applied when the brake pedal is depressed.
Source: Alabama CDL Manual
All choices
- AApply extra braking power to the non-drive axles.
- BHelp slow the vehicle while driving and reduce brake wear.
- CHelp prevent skids.
Alabama CDL General Knowledge Test Info
Questions on Exam
50
Passing Score
80%
Time Limit
Typically 60 minutes; varies by testing location
Age Requirements
Intrastate: 18+ · Interstate: 21+
Alabama Law Enforcement Agency (ALEA)
Official CDL PortalReady to pass your Alabama CDL General Knowledge 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 General Knowledge Practice Questions
- Retarders:
- The bridge formula:
- Controlled braking:
- Stab braking should not be used on vehicles with:
- The BAC (Blood Alcohol Concentration) for commercial drivers to be considered intoxicated when driving a commercial vehicle is: