Home › CDL Practice Tests › General Knowledge Questions › Question 380
When checking gauges during the pre-trip with the engine running, what combination deserves action before driving?
- A.Any gauge outside its normal range, any warning light on, or air pressure that will not build to cut-out, because these are defects that worsen under load
- B.Only a low fuel gauge matters
- C.Gauges are checked only at delivery
- D.Warning lights during warm-up are decorative
Correct answer
A. Any gauge outside its normal range, any warning light on, or air pressure that will not build to cut-out, because these are defects that worsen under load
Why
The cab check is a system-by-system confirmation that oil, air, charging, and cooling are ready for work. Rolling out with an abnormal reading converts a shop repair into a roadside breakdown or an in-motion failure.
Manual topic: Gauges - Pre-Trip · From the General Knowledge practice bank (GK-380).