Home › CDL Practice Tests › General Knowledge Questions › Question 118
When should you decide to shift up in a manual transmission truck?
- A.After a fixed number of seconds in each gear
- B.Only by the sound of the tires
- C.By watching engine rpm and road speed and shifting at the point the maker recommends for that gear
- D.Whenever the truck reaches a hilltop
Correct answer
C. By watching engine rpm and road speed and shifting at the point the maker recommends for that gear
Why
Each gear has an rpm range where the engine pulls well without over-revving or lugging. Using the tachometer, and speed where there is no tach, keeps the engine in that range and avoids missed shifts.
Manual topic: Basic Control - Shifting Gears · From the General Knowledge practice bank (GK-118).