CDL – COMBINATION VEHICLE PRACTICE TEST QUESTIONS AND CORRECT ANSWERS 2024/2025 GRADED A+.

1. A tractor with a(n) trailer requiresthe shortest amount ofstopping distance . 1. empty 2. fully loaded 3. lightly loaded 2. The air leakage rate for a combination vehicle ( engine off,brakes on)should not be more than psi per minute . 1. 4 2. 6 3. 2 3.If you do not do the final air brake check for air leaks and fix them before driving, 1. you could lose your brakes while driving 2. your fuel usage will increase 3. tire pressure will drop 4. Which part of the kingpin should the locking jaws close around?: The shank 5. Glad hands are used to connect the .... 1. kingpin from the trailer to the locking jaws of the fifth wheel 2. electrical lines from the tractor to the trailer 3. service and emergency air lines from the truck or tractor to the trailer:ser- vice and emergency air lines from the truck or tractor to the trailer 6. Trucks roll over more easily when fully loaded and are A. ten times more likely to roll over in a crash than empty rigs B. five times more likely to roll over in a crash than empty rigs 7. two times more likely to roll over in a crash than empty rigsIn general, the higher your trucks center of gravity, the ... 3 / 12 1. easier it is to turn over 2. more stable it is when turning 3. easier it is to turn around corners: easier it is to turn over 8. You are driving a combination vehicle when the trailer breaks away, pulling apart both air lines.You would expect the trailer brakes to come on and ... 1. the tractor to lose all air pressure 2. the tractor protection valve to close 3. the trailer supply valve to stay open: the tractor protection valve to close 9. When you drive a set of doubles, which shut-off valve must be closed in the last trailer? 1. Middle section