CDL COMBINATION VEHICLES

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CDL COMBINATION VEHICLES TRUE OR FALSE: More than half of truck driver deaths in crashes are the result of truck rollovers. - ✔✔True Fully loaded rigs are ___ times more likely to roll over in ... a crash than empty rigs. - ✔✔10 What can you do to prevent rollovers? - ✔✔keep the cargo close to the ground drive slowly around turns TRUE OR FALSE: Keeping cargo low is even more important in combination vehicles than in straight trucks. - ✔✔True Rollovers happen when you turn too___ - ✔✔Fast Trucks with trailers have a dangerous... - ✔✔crack the whip effect TRUE OR FALSE: When pulling trailers, a sudden movement with your steering wheel may cause your tralier to tip over. - ✔✔True Large combination vehicles take longer to stop when they are... - ✔✔Empty How much follwoing distance should you have? - ✔✔At leats 1 second for every 10 feet of vehicle length under 40 mph. How much following distance should you have driving 50 mph? - ✔✔At least 1 second for every 10 feet of your vehicle plus an additional second. When lightly loaded, the very stiff suspension springs and strong brakes give poor traction. - ✔✔True TRUE OR FALSE: Tests have shown that bobtails are easy to stop. - ✔✔False In any combination rig, allow lots of ___ distance and look far ahead. - ✔✔Following What is the best way to recognize that the trailer has started to skid? - ✔✔Seeing it in your mirriors. TRUE OR FALSE: When braking hard you should check your mirriors to make sure that your trailer is staying where it should? - ✔✔True Why should you not use the trailer hard brake to straighten out a jackknifing trailer. - ✔✔This is the wrong thing to do since the brakes on the trailer wheels caused the skid in the first place. Once the trailer wheels grip the road again, the trailer will start to follow the tractor and starighten out. What is off tracking? - ✔✔When a vehicle goes around a corner, the rear wheels follow a different path than the front wheels. Longer vehicles will off track more. TRUE OR FALSE: If you must back on a curved path, back to the drivers side so you can see. - ✔✔True What type of trailers can get stuck on rail-road highway crossing? - ✔✔Lowboy Car Carrier Why should you not use the trailer hand valve while driving? - ✔✔The trailer hand valve should only be used to test the brakes. Do not use it in driving because of the danger of making the trailer skid. Describe what trailer air supply control does. - ✔✔You push it in to supply the trailer with air, and pull it out to shut the air off and put on the trailer emergency brakes. The valve will pop out ( closing the tractor protection valve ) when the air pressure drops into the range of 20-45 psi. Describe what the service line is for. - ✔✔The service line ( called the control line ) carries air, which is controlled by the foot brake or the trailer hand brake. Depending on how hard you press the foot brake or hand valve, the pressure in the service line will similarily change. What does the emergency air line do? - ✔✔It supplies air to the trailer air tanks Loss of air pressure in the emergency line causes the trailer emergency brakes to come on. TRUE OR FALSE: Blue is used for the service line and red for the emergency. - ✔✔True Why should you use chocks when parking a trailer without spring brakes. - ✔✔Eventually, the air will leak away and there will be no brakes. Where are shut-off valves? - ✔✔In the back of the trailer. TRUE OR FALSE: You may not notice a major leak in the service line until you try and put on the brakes. - ✔✔True TRUE OR FALSE: All new trailers and converter dollies are requirered to have anti-lock brakes. - ✔✔True TRUE OR FALSE: ABS will increase your stopping distance. - ✔✔False TRUE OR FALSE: Trailers will have yellow ABS malfunction lamps on the right side of the trailers. - ✔✔False When you drive a tractor-trailer combination with ABS, you should... - ✔✔Brake as you always have. TRUE OR FALSE: If your ABS malfunctions, you will loose your brakes - ✔✔False TRUE OR FALSE: ABS makes it possible to drive faster more safely. - ✔✔False When coupling you should inspect the 5th wheel which will include... - ✔✔Grease on the 5th wheel plate 5th wheel in proper position and tilted d [Show More]

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