Basic Control of Your Vehicle — CDL General Knowledge Practice Test
30 questions in this topic · 30 drawn at random this round
On a tractor-trailer equipped with a trailer brake hand valve, how can the hand valve help when starting on a hill?
Session Progress
This CDL General Knowledge Basic Control of Your Vehicle practice set has 30 practice questions based on the official exam materials, each with an instant explanation. You need 80% on the real CDL General Knowledge knowledge test to pass.
Sample questions
Three questions from the Basic Control of Your Vehicle bank with the correct answer and an explanation. The practice quiz above draws 30 questions at random from the same bank.
Safe operation of a commercial vehicle requires skill in controlling its speed and direction. Which of these is one of those basic control skills?
- Backing safely — Correct answer
- Reading a map while driving
- Adjusting the radio volume
- Checking your fuel receipts
Explanation: Safe operation requires skill in accelerating, steering, stopping, and backing safely — these are the basic vehicle-control skills. English term: basic vehicle control（基本车辆控制 / control básico del vehículo）.
Handbook: Basic Control & Shifting — Basic Control Skills
Why should you avoid rolling back when you start the vehicle moving?
- You may hit someone or something behind you — Correct answer
- It uses too much fuel
- It wears out the front tires
- It is only a problem on flat ground
Explanation: Don't roll back when you start — you may hit someone or something behind you. English term: rollback（后溜 / retroceso involuntario）.
Handbook: Basic Control & Shifting — Accelerating
In a vehicle with a manual transmission, how do you keep from rolling back when you start moving?
- Partly engage the clutch before taking your right foot off the brake — Correct answer
- Press the accelerator fully before releasing the clutch
- Shift directly into the highest gear
- Rev the engine and pop the clutch quickly
Explanation: Partly engage the clutch before you take your right foot off the brake; put on the parking brake whenever needed to keep from rolling back. English term: clutch（离合器 / embrague）.
Handbook: Basic Control & Shifting — Accelerating