General Knowledge Flashcards
What is the minimum tread depth for front tires?
4/32 of an inch
What is the minimum tread depth for other tires?
2/32 of an inch
How far ahead should you scan the road while driving?
12-15 seconds ahead
What should you check during a pre-trip inspection?
Brakes, tires, lights, fluids, leaks, emergency equipment, etc.
What is the air pressure range for normal air brake operation?
100-125 PSI
At what PSI does the low air pressure warning activate?
Around 60 PSI
What happens if the air brake system pressure drops below 20-45 PSI?
The spring brakes will engage automatically.
What is the purpose of the emergency air brake system?
To stop the vehicle if the service brake system fails.
Why should you never leave a truck unattended without applying the parking brakes?
The vehicle could roll away.
What is the best way to slow down on a downgrade?
Use engine braking and downshift to control speed.
What should you do if your vehicle starts skidding?
Turn in the direction you want to go and avoid braking.
What is a key sign of a distracted driver?
Drifting between lanes, inconsistent speed, or not reacting to traffic signals.
How should you check for leaks in air brake systems?
Perform a leak-down test by holding the brake pedal and monitoring pressure loss.
What is the ‘following distance’ rule for commercial vehicles?
One second for every 10 feet of vehicle length, plus more in bad weather.
How can you prevent cargo from shifting?
Use proper load securing techniques like straps and load bars.
