2019 CDL General Knowledge Exam Practice Study Questions & Answers 20190718



turned on break retards apply their power whenever you let up all the way on the accelerator pedal what is the minimum number of tie downs that you should have you should have at least two tie downs should you turn your retarders off when the road is wet or snow-covered yes the retarders could cause your vehicle to skid slight melting will make ice wet what is more slippery what ice is more slippery at dawn or dusk or in rain or snow when it is difficult for other drivers to see you you might turn on your low beam headlights since air pressure increases with temperature increases you should leave the warm tires alone since the air pressure will decrease when the tires cool off speed limits that are posted at freeway off-ramps may not be safe speeds for larger vehicles or heavily loaded vehicles how do you test hydraulic brakes for a leak with a vehicle stopped pump the brake pedal three times then apply firm pressure then hold for five seconds when merging with other traffic you should use your mirrors to make sure the gap and the traffic is large enough for you to enter what are some steering system defects to look for missing nuts bolts cotter keys or other parts the amount of space you need to cross or enter traffic is affected by the weight of your load how many times more distance does it take to stop when your speed is doubled four times what are two factors in knowing when to shift those factors are using the engine speed and Road speed if you have to stop your vehicle in the road to load cargo or passengers you should flash your brake lights to warn drivers behind you why do empty trucks usually require greater stopping distances empty trucks can balance and lock up their wheels what is the only way to stop a front wheel skid let the vehicle slow down stop turning and stop braking so hard what is important about the center of gravity of a load a high center of gravity means you are more likely to tip the vehicle over are you required to show your logbook to an officer when asked yes before putting tire chains on your vehicle you check to be sure that the chains have no broken hooks or cross links or bent or broken side chains if you think that a tire has blown out what should you do in stopping your vehicle hold steering wheel firmly and don't touch the brakes until the vehicle has slowed what is black ice black ice is a thin layer of ice so clear you can see the road beneath it as soon as you see your trailer getting off the proper backing path you should turn the top of the steering wheel in the direction of the drift what should you do if your vehicle hydroplanes release the accelerator and push in the clutch to keep your vehicle from rolling back when you start up you should partly engage the clutch before you take your right foot off of the brake what is a good reason for knowing what the traffic is doing on all sides you need to have room to change lanes or stop what is controlled braking it's applying the brakes as hard as you can without locking the wheels whenever you are about to pass a vehicle pedestrian or cyclist you should assume that they have not seen you convex mirrors show a wider area than flat mirrors but they also make things seem farther away than they really are what are three factors of total stopping distance with hydraulic brakes perception reaction and breaking distance when backing a trailer you may make corrections to reposition your vehicle by pull ups empty buses may not require more stopping distance than loaded buses because they usually have as much braking power when empty as when loaded where do you place the three reflector triangles on a two-lane road within ten feet of the rear 100 feet of the rear and 100 feet from the front of the vehicle when should you use your high beam headlights whenever you can providing the law allows it in holding a steering wheel what is the proper way to place your hands firmly with your hands on opposite sides of the steering wheel if you have to set out warning reflective triangles by the highway you should hold them between yourself and oncoming traffic what are some things to do when you are backing your vehicle look at your path back slowly and back straight back what are some defects to look for in the suspension system spring hangers that are cracked or broken when should you downshift for a curve you should downshift before entering the curve besides looking for vehicles coming into your lane looking for traffic means it means watching for the brake lights of slowing vehicles ahead of you what is the purpose of cargo blocking and bracing that would be to keep the cargo from sliding and falling and getting out of balance when you need to slow down you may want to warn drivers behind you by tapping lightly on the brake pedal to flash the brake lights when backing a trailer you should turn the steering wheel opposite the direction you want to go what is the major cause of most serious skids driving too fast for road conditions antifreeze is effective under hot conditions as well as cold what is the maximum distance between tie-downs to prevent cargo shifting tie down every 10 feet what should you do when using a fire extinguisher to fight a fire aim at the base of the fire when checking tires what are some problems you should look for bad where cuts or other damage tread separation cracked valve stems how can you know you have the engine speed and road speed to shift gears you'll know by listening to the sound the engine makes when you are backing your vehicle with the assistance of a helper your helper should agree with you for the signal for stop and he should stand where you can see him at all times wheels or rims that have been repaired by welding are unsafe what are some items to check especially before driving in winter weather the coolant level the windshield washer level the antifreeze level antifreeze for your windshield washer fluid besides watching the traffic behind you you can use your rearview mirrors to watch for possible tire fires what is a good policy for using your brakes when pulling off the road try to avoid using your brakes until your speed has dropped to about 20 miles per hour should you always be looking into the distance ahead No shift your tension back and forth near and far at night in order to avoid the glare of oncoming traffic what is a good direction to look look at the right side of the road and watch the sidelines why can't you assume your vehicle will clear the posted height at an overpass because some roads might not be level and could cause your vehicle to tilt how much time does it take to stop a heavy vehicle while going 55 miles per hour on a dry Louisville Road about the length of a football field or about six seconds you want to turn right and must swing wide you should turn wide as you complete the turn some newer vehicles have progressive shifting which means the RPMs at which you shift become higher as you move up in the gears rusts around the lug nuts may indicate that the lug nuts are loose hence the wheel may be loose if the vehicle and oncoming traffic is approaching you with its high beams on you should keep your low beams on don't turn on your high beams and look at the right side of the road until the vehicle passes you what should you consider about downshifting before you reach a long downhill grade downshifting helps prevent the brakes from overheating and from losing braking power whether backing a straight truck or a combination vehicle you should back and turn towards the driver's side how often should you check your tires when driving in very hot weather check them every two hours or every 100 miles because of your vehicle's large size you may wish to flash your brake lights to alert drivers behind you of hazards that you see ahead what is the purpose of brake retarders retarders help slow the vehicle and reduce brake wear when driving at night what rule should you follow be ready to stop within the range of your headlights downshifting requires knowing when to shift to do this correctly you should use the tachometer or speedometer in making a quick turn what should you remember don't apply the brakes while turning how do you reduce the odds of having to make a sudden move to avoid a hazard watch far enough ahead so you can anticipate a potential hazard roads usually become more slippery when ice begins to melt what should you do before you drive if you are feeling drowsy get some sleep to make a tight turn with a large vehicle you may have to make the turn more slowly than many non-commercial drivers would expect with a pressurized cooling system you should not remove the radiator cap until the cooling system has cooled what is a danger when traveling alongside other vehicles you may be trapped in your lane when you need to change lanes how far ahead should you look while driving you should look 12 to 15 seconds ahead of you while driving if you are turning left what lane should you use of 2 left turn lanes use the right-hand lane what can happen if you do not have enough weight on the steering axle this can make the vehicle harder to steer while making a turn you should look in your mayor's to make sure that the rear of your trailer will not hit anything as a commercial driver with respect to your car go what are you responsible for you're responsible for inspecting your cargo and knowing that it is securely tied down or covered if the cargo contains any hazardous materials you must check to see that placards are required what is a problem you can have when using your mirrors there are blind spots that your mayor's cannot show you what is the minimum amount of tread depth that your tires should have for thirty seconds of an inch on the front wheel tires and two thirty seconds of an inch on all other wheel tires a pre-trip inspection should be performed before each trip when going downhill in a vehicle with an automatic transmission you should select a low range to get greater engine braking what are some things to do if you are being tailgated avoid quick changes of speed or direction to be sure that you know what is happening on the highway ahead of you don't focus on the mares too long exhaust system parts should not rub against fuel system parts tires or other moving parts of the vehicle how do you tell hydraulic brakes further of stopping action go about five miles per hour and then push the brake pedal firmly a good rule for using turn signals is if you don't have self counseling turn signal indicators remember to turn off the turn signal indicator after you have completed your turn when traction is poor such as in rain or snow how should you speed up very gradually where do you place the three reflector triangles on a divided highway place them all to the rear within ten feet 100 feet and 200 feet how often should cargo inspections be made after every break during driving when driving over 40 miles per hour how much space should you try to keep in front of your vehicle at least one second for 10 feet of your vehicle plus one second what is a vehicle condition report a list of problems found by you what are two of three good rules for using turn signal indicators signal early and signal continuously before starting down a hill you want to make sure that you are in the proper gear you downshift before starting down the hill how does tire pressure affect hydroplaning hydroplaning is more likely to occur when tire pressure is low when should you help out other drivers by signaling that it is safe for them to pass never signal to let others know it is safe to pass what is probably your best driving speed traffic is moving at 35 miles per hour in a 55 mile per hour zone 35 miles per hour is probably your best driving speed to make a tight turn with a large vehicle you may have to make the turn more slowly than many non-commercial drivers would expect with a pressurized cooling system you should not remove the radiator cap until the cooling system has cooled what is a danger when traveling alongside other vehicles you may be trapped in your lane when you need to change lanes how far ahead should you look while driving you should look 12 to 15 seconds ahead of you while driving if you are turning left what Lane should you use of 2 left turn lanes use a lane on the right hand what can happen have enough weight on the steering axle this can make the vehicle hard to steer while making a turn you should look in your mirrors to make sure that the rear of your trailer will not hit anything as a commercial driver with respect to your cargo what are you responsible for inspecting your cargo and knowing that it's securely tied down and/or covered if the cargo contains any hazardous materials you must check to see if placards are required what is a problem you can have when using your mirrors there are blind spots that your mayor's cannot show you what is the most important reason for doing a vehicle inspection safety is the most important reason you inspect your vehicle safety for yourself and for other road users finding a vehicle dis pect during an inspection could save you problems later what things should you check during a trip you should check instruments air pressure gauge if you have air brakes temperature and pressure gauges ammeter and voltmeter mirrors tires cargo cargo covers and lights if you see hear smell or feel anything that might mean trouble check it out name some key steering system parts steering wheel steering shaft gearbox hydraulic fluid reservoir power steering cylinder tie rod steering arm pitman arm drag link steering knuckle and spindle name some pension system defects missing or broken leaves in any leaf spring if one fourth or more are missing it will put the vehicle in out of service but any defect could be dangerous broken leaves in a multi leaf spring or leaves that have been shifted so they might hit the tire or other parts leaking shock absorbers torque rod or arm u-bolts spring hangers or other axial positioning parts that are cracked damaged or missing air suspension systems that are damaged or leaking any loose cracked broken or missing frame members what three kinds of emergency equipment must you have fire extinguisher spare electrical fuses unless equipped with circuit breakers warning devices for parked vehicles for example three reflective warning triangles or six fuses or three liquid burning flares optional items may include chains where winter conditions require them tire changing equipment list of emergency phone numbers and an accident reporting kit or packet what is the minimum tread depth for front tires for other tires you need at least four thirty-second inch tread depth and every groove on front tires you need two thirty Seconds inch on other tires name some things you should check on the front of your vehicle during the walk-around inspection door and passenger door glass should be clean door latches or locks should work properly continued condition of wheels and rims missing bent broken studs clamps lugs or any signs of misalignment condition of tires properly inflated valve stem and cap okay no serious cuts bulges our tread wear use wrench to test rust straight lug nuts indicating looseness hub oil level okay no leaks continued condition of spring this is for the front suspension spring hangers shackles u-bolts shock absorber condition continued front brakes condition of brake drums or disc brake pad has at least one quarter inch of material condition of brake shoe condition of hoses continued can front condition of front axle condition of steering system no loose worn bent damaged or missing parts must grab steering mechanism to test for looseness continued condition of windshield check for damage and clean of dirty check windshield wiper arms for proper spring tension check wiper blades for damaged stiff rubber and securement continued lights and reflectors parking clearance and identification lights clean operating and proper color amber at front reflectors clean and proper color amber at front front turn signal lights clean operating and proper color amber or white on signal facing forward what should we obey ring seals be checked for to make sure that they are not cut damaged or loose and visually see that they are not leaking fluid how many red reflective triangles should you carry a commercial driver must carry three reflective triangles in his truck at all times how do you test hydraulic brakes for leaks pump the brake pedal three times then apply firm pressure to the pedal and hold it for five seconds the pedal should not move if it does there might be a leak or other problems why put the starter switch key in your pocket during the vehicle inspection the driver should keep the starter key on his person while performing the pre-trip inspection so that no one can start the engine while the vehicle inspection is being performed 2019 CDL general knowledge exam questions and answers when backing a trailer you should turn the steering wheel opposite the direction you want to go what is the major cause of most serious skids driving too fast for road conditions antifreeze is effective under hot conditions as well as cold what is the maximum distance between tie-downs to prevent cargo shifting tie down every 10 feet what should you do when using a fire extinguisher to fight a fire aim at the base of the fire when checking tires what are some problems you should look for bad where cuts or other damage tread separation cracked valve stems how can you know you have the engine speed and road speed to shift gears you'll know by listening to the sound the engine makes when you are backing your vehicle with the assistance of a helper your helper should agree with you for the signal for stop and he should stand where you can see him at all times wheels or rims that have been repaired by welding are unsafe what are some items to check especially before driving in winter weather the coolant level the windshield washer level the antifreeze level antifreeze for your windshield washer fluid what is the minimum amount of tread depth that your tires should have for 30 seconds of an inch on the front wheel tires and two thirty seconds of an inch on all other wheel tires a pre-trip should be performed before each trip when going downhill and a vehicle with automatic transmission you should select a low range to get greater engine braking what are some things you should avoid if you're being tailgated avoid quick changes of speed or direction to be sure you know what is happening on the highway ahead of you don't focus too long on your mirrors exhaust system parts should not be they should not rub against fuel system parts tires or other moving parts of the vehicle how do you test hydraulic brakes for they're stopping action go about 5 miles per hour and then push the brake pedal firmly a good rule of thumb for using turn signals is if you don't have self counseling turn signal indicators remember to turn them off after you complete a turn when try poor such as in rain or snow how should you speed up very gradually where do you place the three reflective triangles on a divided highway place them all to the rear within ten feet 100 feet and 200 feet why should you back toward the driver's side so you can see better backing toward the right side is very dangerous because you can't see as well stopped on a hill how can you start moving without rolling back for manual transmission partly engage the clutch before you take your right foot off of the brake or put the parking brake on whenever necessary to keep you from rolling back on a tractor trailer equipped with a trailer handbrake valve the hand valve can be applied to keep from rolling back when backing why is it important to use a helper there are blind spots that you can't see important hand signal that you and the helper should agree on stop what are two special conditions where you should downshift before entering the curve before starting down a hill we downshift automatic transmissions you can select a low range to get greater engine braking when going down downgrades also pay attention some vehicles have automatic transmissions you can select a low range to get greater engine braking when going down grades the lower range prevents the transmission from shifting up beyond the selected gear unless the governor rpm is exceeded it is very important to use this braking effect when going down grade retarders keep you from skidding when the road is slippery true or false false retarders help slow a vehicle reducing the need for using your brakes when you drive wheels have poor traction the retarders may cause them to skid therefore you should turn the returned pardon me you should turn the returners off whenever the road is wet icy or snow covered are two ways to know when to shift use engine speed watch your tachometer and shift up when the engine reaches the top of the range for your engine action is poor such as in rain or snow how should you speed up very gradually where do you place the three reflector triangles on a divided highway place them all to the rear within 10 feet 100 feet and 200 feet how often should cargo inspections be made after every break during driving when driving over 40 miles per hour how much space should you try to keep in front of your vehicle at least one second for 10 feet of your vehicle plus one second what is a vehicle condition report a list of problems found by you what are two of three good rules for using turn signal indicators signal early and signal continuously before starting down a hill you want to make sure that you are in the proper gear you downshift before starting down the hill how does tire pressure affect hydroplaning hydroplaning is more likely to occur when tire pressure is low when should you help out other drivers by signalling that it is safe for them to pass never signal to let others know it is safe to pass what is probably your best driving speed traffic is moving at 35 miles per our in a 55 mile per hour zone 35 miles per hour is probably your best driving speed how often should you inspect cargoes or how often should cargo inspections be made after every break during driving when driving over 40 miles per hour how much space should you try to keep in front of your vehicle at least one second for 10 feet of your vehicle length plus one second what is a vehicle condition report it's a list of problems that you find what should you do before you drive if you are feeling drowsy get some sleep what are two of three good rules for using your turn signal indicators signal early and signal continuously before starting down a hill you want to be sure that you are going in the proper gear so you downshift before starting down the hill how does tire pressure affect hydroplaning hydroplaning is more likely to occur when tire pressure is low when should you help out other drivers by signaling that it is safe for them to pass never never use your signals to let others know it is safe to pass what is probably your best driving speed traffic is moving at 35 miles per hour in a 55 mile per hour zone 35 miles per hour is probably your best driving speed turned on brake retarders apply their pressure whenever you let up all the way on the accelerator pedal how far ahead does the manual say you should look the manual indicates that you should look 12 to 15 seconds ahead which means that this is the distance you would travel in 12 to 15 seconds at a slower speed that would be about a block at highway speeds it's about a quarter of a mile what are two main things to look for ahead look for traffic vehicles coming onto the highway into your lane or turning watch for brake lights from slowing vehicles look for road conditions look for hills and curves anything you'll have to slow or change lanes for it pay attention to traffic signals and signs watch for still green lights that may change before you get there what's your most important way to see the sides and rear of your vehicle mirrors mayors help you see the size and rear of your vehicle what does communicating mean and safe driving it means signalling your intentions where should you place reflectors when stopped on a divided highway all to the rear of the vehicle at ten feet 100 feet and 200 feet towards the approaching traffic traffic is approaching your vehicle from the rear this rule also applies for one-way streets what are three things for me what three things add up to total stopping distance one perception distance two reaction distance and three braking distance if you go twice as fast your stopping distance increases by two or four times answer four times the preceding answer is true four speeds from twenty to 40 miles per hour stopping distance under the paragraph heading the effects of speed on stopping distance which states when you double your speed from twenty to forty miles per hour the impact is four times greater the braking distance is also four times longer keep in mind the greater the speed the greater the effect empty trucks have the best braking true or false false empty trucks require greater stopping distance because an empty vehicle has less traction it can bounce and lock up its wheels giving much poorer braking stopping distance under the paragraph heading the effect of vehicle weight on stopping distance which states empty trucks require greater stopping distance because an empty vehicle has less traction the reason for that is because empty trucks don't have as much weight on the tires as loaded trucks have on them for trucks more weight within reason on the tires equals better traction what is hydroplaning hydroplaning which is comparable to your tires waterskiing happens when the tires lose their contact with the road and have little or no traction you can regain control by releasing the accelerator and pushing in the clutch what is black ice black ice is a thin layer that is clear enough that you can see the road underneath it it makes the road look wet at any time the temperature is below freezing and the road looks wet watch out for black ice besides watching the traffic behind you you can use your rearview mirrors to watch for possible tire fires what is a good policy for using your brakes when pulling off the road try to avoid using your brakes until your speed has dropped to about 20 miles per hour should you always be looking into the distance ahead No shift your tension back and forth near and far at night in order to avoid the glare of oncoming traffic what is a good direction to look look at the right side of the road and watch the sidelines why can't you assume your vehicle will clear the posted height at an overpass because some roads might not be level and could cause your vehicle to tilt how much time does it take to stop a heavy vehicle while going 55 miles per hour on a dry level Road about the length of a football field or about six seconds you want to turn right and must swing wide you should turn wide as you complete the turn some newer vehicles have progressive shifting which means the RPMs at which you shift become higher as you move up in the gears rusts around the lug nuts may indicate that the lug nuts are loose hence the wheel may be loose if the vehicle and oncoming traffic is approaching you with its high beams on you should keep your low beams on don't turn on your high beams and look at the right side of the road until the vehicle passes you what is the minimum number of tie-downs that you should have you should have at least two tie-downs why should you turn off retarders when the road is wet or covered with snow they could cause your vehicle to skid slight melting will make ice wet which is more slippery what ice is more slippery at dawn or dusk and rain or snow when it is difficult for other drivers to see you you might turn on your low beam headlights since air pressure increases with temperature increases you should leave tires alone that are warm since the air pressure inside of them will decrease when the tires cool speed limits that are posted at freeway off-ramps may not be safe speeds for larger vehicles or heavily loaded vehicles how do you test hydraulic brakes for a leak with the vehicle stopped pump the brake pedal three times and then apply firm pressure and then hold for five seconds when merging with other traffic you should use your mirrors to make sure that the gap in the traffic is large enough for your vehicle to enter what are some steering system defects to look for missing it's volts or Cotter keys the amount of space you need to cross or to enter traffic is affected by the weight of your load how do you find out how many seconds of following distance space you have wait until the vehicle ahead passes and count off the seconds like this 1,001 1,002 and so on until you reach the same spot keep at least 4 seconds for 40-foot truck and 5 seconds if you are going over 40 miles per hour if you are driving a 30 foot vehicle at 55 miles per hour how many seconds of following distance should you allow allow at least 4 seconds you should decrease your following distance if somebody is following too closely true or false false increase your following distance opening up room in front of you will help you to avoid having to make sudden speed or direction changes it also makes it easier for the tailgater to get around you if you swing wide to the left before turning right another driver may try to pass you on the right true or false true what is a hazard hazard is any road condition or other road user driver bicyclists pedestrian that is a possible danger I make emergency plans when you see a hazard in prepared will reduce the danger always have a plan you look for the hazards in order to have time to plan a way out of any emergency when you see a hazard think about the emergencies that could develop and figure out what you would do always be prepared to take action based on your plans there Agro contains any hazardous materials you must check to see that placards are required what is a problem you can have when using your mirrors there are blind spots that your mayor's cannot show you what is the minimum amount of tread depth that your tires should have for 30 seconds of an inch on the front wheel tires and to 30 seconds of an inch on all other wheel tires a pre-trip inspection should be performed before each trip when going downhill in a vehicle with an automatic transmission you should select a low range to get greater engine braking what are some things to do if you are being tailgated avoid quick changes of speed or direction to be sure that you know what is happening on the highway ahead of you don't focus on the mirrors too long exhaust system parts should not rub against fuel system parts tires or other moving parts of the vehicle how do you test hydraulic brakes further stopping action go about five miles per hour and then push the brake pedal firmly a good rule for using turn signals is if you don't have self counseling turn signal indicators remember to turn off the turn signal indicator after you have completed your turn how many times more distance does it take to stop when your speed is doubled about four times what are two factors in knowing when to shift that would be engine speed and road speed if you have to stop your vehicle in the road to load cargo or passengers you should flash your brake lights to warn drivers behind you why do empty trucks usually require greater stopping distances empty trucks can bounce and lock up their wheels what is the only way to stop a front wheel skid let the vehicle slow down stop turning and stop braking so hard what is important about the center of gravity of a load a high center of gravity means you are more likely to tip over the vehicle must you show your law books to officers yes before putting tire chains on your vehicle to check be sure that the chains have no broken hooks cross links or bent or broken side chains if you think that a tire is blown out you should Army what should you do and stopping your vehicle hold steering wheel firmly and don't touch the brakes until the vehicle eyes slow down what is black ice black ice is a thin layer of ice so clear that you can see the road underneath it what are some tips to follow so you won't become a distracted driver turn off all communication devices do not text or read text messages while driving familiarize yourself with your vehicle's features equipment and before you get behind the will adjust all vehicle controls and mirrors to your preference prior to driving pre-program radio stations and preload your favorite CDs clear the vehicle of any unnecessary objects and secure cargo etc how do you use in vehicle communications equipment cautiously assessing all potential in vehicle distractions before driving developing a preventive plan to reduce or eliminate possible distractions expecting distractions to occur and discussing possible scenarios before getting behind the wheel how do you recognize a distracted driver vehicles may drift over the lane divider lines or within their own lanes cars traveling at inconsistent speeds drivers preoccupied with maps food and cigarettes cell phones or other object drivers who appear to be involved in conversations with their passengers what is the friends between aggressive driving and road rage aggressive driving is the act of operating a car in a selfish bold or pushy manner without regard for the rights or safety of others road rage is operating a motor vehicle with the intent of doing harm to others or physically assaulting a driver or their vehicle what should you do when confronted with an aggressive driver get out of his way put your pride in the backseat don't challenge him by speeding up avoid eye contact ignore gestures and refused to react to him report aggressive drivers to the authority what are some things you can do to reduce your stress before and while you drive listen to easy listening music give the drive your full attention be realistic about your travel time if you're going to be later than expected deal with it give other drivers the benefit of the doubt slow down and keep your following distance reasonable don't drive too slowly in the left lane of traffic avoid gestures be a cautious and courteous driver what should you consider about downshifting before you reach a long downhill grade downshifting helps prevent the brakes from overheating and from losing braking power whether backing a straight truck or a combination vehicle you should back and turn towards the driver's side how often should you check your tires when driving in very hot weather check them every two hours or every 100 miles because of your vehicle's large size you may wish to flash your brake lights to alert drivers behind you of hazards that you see ahead what is the purpose of brake retarders retarders help slow the vehicle and reduce brake wear when driving at night what rule should you follow be ready to stop within the range of your headlights downshifting requires knowing when to shift to do this correctly you should use the tachometer or speedometer in making a quick turn what should you remember don't apply the brakes while turning how do you reduce the odds of having to make a sudden move to avoid a hazard watch far enough ahead so you can anticipate a potential hazard roads usually become more slippery when ice begins to melt as soon as you see your trailer getting off the proper backing path you should turn the top of the steering wheel and the direction of the drift what should you do if your vehicle hydroplanes release the accelerator and push in the clutch to keep your vehicle from rolling back when you start up you should partly engage the clutch before you take your right foot off of the brake what is a good for knowing what traffic is doing on all sides you need to have room to change lanes or stop what is controlled braking it's applying the brakes as hard as you can without locking the wheels whenever you are about to pass a vehicle pedestrian or cyclist you should assume that they haven't seen you convex mirrors show a wider area than flat mirrors but they also make things seem farther away than they really are what are three factors of total stopping distance with hydraulic brakes perception reaction and braking distance when a trailer you may make corrections to reposition your vehicle by pull ups empty buses may not require more stopping distance than loaded buses because they usually have as much braking power when empty as when loaded you should use your low beams whenever you can true or false false use high beams when you can some drivers make the mistake of always using low beams this can see really cut down on their ability to see ahead use high beams when it is safe and legal to do so use them when you are not within 500 feet of an approaching vehicle what you you do before you drive if you are drowsy if you are drowsy sleep before you drive even a nap can save your life or the lives of others what effects can wet brakes cause how can you avoid these problems when driving in heavy rain or deep standing water your brakes will get wet water in the brakes can cause the brakes to be weak to apply unevenly or to grab this can cause lack of braking power will lockups pulling to one side or the other and jackknife if you pull a trailer avoid driving through deep puddles or flowing water if possible if not you should slow down place the transmission in low gear and gently put on your brakes this presses linings against brake drums or discs and keeps mud silt sand and water from getting in increase engine RPMs and cross the water at while keeping light pressure on the brakes when out of water maintain light pressure on the brakes for a short distance to heat them up and dry them out make a test stop when safe to do so check behind to make sure no one is following and then apply the brakes to be sure they work well if not dry them out further as described above caution do not apply too much brake pressure and depress the accelerator at the same time or you can overheat the brake drums and lining you should let air out of hot tires so the pressure goes back to normal true or false false air pressure increases with temperature do not let air out or the pressure will be too low when the tires cool off if a tire is too hot to touch remain stopped until the tire cools off otherwise the tire may blow out or catch fire can you safely remove the radiator cap as long as the engine isn't overheated what constitutes an overheated engine what if the engine hasn't overheated but is just hot the CDO manual states never remove the radiator cap or any part of the pressurized system until the system has cooled steam and boiling water can spray under pressure and cause severe burns if you can touch the radiator cap with your bare hand it is probably cool enough to open what should you do before you drive if you are feeling drowsy get some sleep to make a tight turn with a large vehicle you may have to make the turn more slowly than many non-commercial drivers would expect with a pressurized cooling system you should not remove the radiator cap until the cooling system has cooled what is a danger when traveling alongside other vehicles you may be trapped in your lane when you need to change lanes how far ahead should you look while driving you should look 12 to 15 seconds ahead of you while driving if you are turning left what lane should you use of to left turn lanes use the right-hand lane what can happen if you do not have enough weight on the steering axle this can make the vehicle harder to steer while making a turn you should look in your mirrors to make sure that the rear of your trailer will not hit anything as a commercial driver with respect to your cargo what are you responsible for you're responsible for inspecting your cargo and knowing that it is securely tied down or covered where do you place the three reflective triangles on a two-lane road within 10 feet of the rear 100 feet to the rear and 100 feet from the front of the vehicle when should you use your high beam headlights whenever you can providing the law allows it in holding a steering wheel what is a proper way to place your hands firmly with your hands on opposite sides of the wheel if you have to set out warning reflective triangles by the highway you should hold them between yourself and oncoming traffic what are some things to do when you are backing your vehicle look at your path back slowly and back straight back what are some defects to look for in the suspension system spring hangers that are cracked or broken when should you shift for a curve you should downshift before entering the curve besides looking for vehicles coming into your lane looking for traffic means it means watching for the brake lights of slowing vehicles ahead of you what is the purpose of cargo blocking and bracing that would be to keep the cargo from sliding and falling and getting out of balance when you need to slow down you may want to warn drivers behind you by tapping lightly on the brake pedal to flash the brake lights what factors determine your selection of a safe speed when going down a long steep downgrade your most important consideration is to select a speed that is not too fast for the total weight of your vehicle and cargo the length of the grade the steepness of the grade the road conditions and the weather why should you be in the proper gear before starting down a hill you want to be in the proper gear before going down a hill because if you try to shift gears when you are driving on the downgrade you might get locked out of engaging any gear and we'll lose all engine braking capability describe the proper braking technique when going down a long steep downgrade the use of brakes on a long or steep downgrade is only a supplement to the braking effect of the engine once the vehicle is in the proper low gear the following are the proper braking techniques apply the brakes just hard enough to feel a definite slowdown when your speed has been reduced to approximately five miles per hour below your safe speed release the brakes this brake application should last for about three seconds when your speed has increased to your safe speed repeat steps one and two for example if your speed is 40 miles per hour you would not apply the brakes until your speed reached 40 miles per hour you apply pardon me you now apply the brakes hard enough to gradually reduce your speed to 35 miles per hour and then release the brakes repeat this as often as necessary until you have reached the end of the downgrade what type of vehicle can get stuck on a railroad highway crossing be aware these trailers can get stuck on raised crossings low-slung units lowboy car carrier moving van opossum belly livestock trailer single axle tractor pulling a long trailer with its landing gear set to accommodate the pardon me set to accommodate a tandem axle tractor how long does it take for a typical tractor trailer unit to clear a double track it takes a typical tractor trailer unit at least 14 seconds to clear a single track and more than fifteen seconds to clear a double track the amount of space you need to cross or enter traffic is affected by the weight of your load how many times more distance does it take to stop when your speed is doubled four times what are two factors in knowing when to shift those factors are using the engine speed and Road speed if you have to stop your vehicle in the road to load cargo or passengers you should flash your brake lights to warn drivers behind you why do empty trucks usually require greater stopping distances empty trucks can balance and lock up their wheels what is the only way to stop a front wheel skid let the vehicle slow down stop turning and stop braking so hard what is important about the center of gravity of a load a high center of gravity means you are more likely to tip the vehicle over are you required to show your logbook to an officer when asked yes before putting tire chains on your vehicle you check to be sure that the chains have no broken hooks or cross links or bent or broken side chains if you think that a tire has blown out what should you do in stopping your vehicle hold steering wheel firmly and don't touch the brakes until the vehicle has slowed what is black ice black ice is a thin layer of ice so clear you can see the road beneath it as soon as you see your trailer getting off the proper backing path you should turn the top of the steering wheel in the direction of the drift what should you do if your vehicle hydroplanes release the accelerator and push in the clutch to keep your vehicle from rolling back when you start up you should partly engage the clutch before you take your right foot off of the brake a good reason for knowing what the traffic is doing on all sides you need to have room to change lanes or stop what is controlled braking it's applying the brakes as hard as you can without locking the wheels whenever you are about to pass a vehicle pedestrian or cyclist you should assume that they have not seen you convex mirrors show a wider area than flat mirrors but they also make things seem farther away than they really are what are three factors of total stopping distance with hydraulic brakes perception reaction and braking distance when backing a trailer you may make corrections to reposition your vehicle by pull-ups empty buses may not require more stopping distance than loaded buses because they usually have as much braking power when empty as when loaded where do you place the three reflector triangles on a two-lane road within ten feet of the rear 100 feet of the rear and 100 feet from the front of the vehicle when should you use your high beam headlights whenever you can providing the law allows it in holding a steering wheel what is the proper way to place your hands firmly with your hands on opposite sides of the steering wheel if you have to set out warning reflective triangles by the highway you should hold them between yourself and oncoming traffic what are some things to do when you are backing your vehicle look at your path back slowly and back straight back what are some defects to look for in the suspension system spring hangers that are cracked or broken when should you downshift for a curve you should downshift before entering the curve besides looking for vehicles coming into your lane looking for traffic means it means watching for the brake lights of slowing vehicles ahead of you what is the purpose of cargo blocking and bracing that would be to keep the cargo from sliding and falling and getting out of balance when you need to slow down you may want to warn drivers behind you by tapping lightly on the brake pedal to flash the brake lights hi this is Barry Brennan thanks for watching my videos I really appreciate it I hope you had a great holiday season I know I did so without any further ado let's get started studying our material when backing a trailer you should turn the steering wheel opposite the direction you want to go what is a major cause of most serious skids driving too fast for road conditions antifreeze as effective under hot conditions as well as cold conditions what is the maximum distance between tie-downs to prevent cargo shifting to prevent cargo shifting tie down every 10 feet what should you do when using a fire extinguisher to fight a fire aim at the base of the fire when checking tires what are some problems that you should look for that where cuts or other damage tread separation cracked Valve's Sims how can you know you have the engine speed and road speed to shift gears by listening to the sound the engine makes to know when to shift then you will know you have the engine speed and road speed to shift gears if you are using a helper when you are backing your vehicle the helper should agree with you beforehand as to the signal for stop also you should stand where you can see him wheels or rims that have been repaired by welding are not safe what are some items to check especially before driving in winter weather the coolant level the windshield washer level and antifreeze level stopping is not always the safest thing to do in an emergency true or false true stopping is not always the safest thing to do in an emergency when you don't have enough room to stop you may have to steer away from what's ahead remember you can almost always turn to miss an obstacle more quickly than you can stop however top-heavy vehicles and tractors with multiple trailers may flip over what are some advantages to going right instead of left around an obstacle if an driver has drifted into your Lane a move to your right is best if that driver realizes what has happened the natural response will be to return to his own lane if the shoulder is clear going right may be best no one is likely to be driving on the shoulder but someone may be passing you on the left you will know if you have been using your mirrors if you are blocked on both sides a move to the right may be best at least you won't force anyone into an opposing traffic lane and a possible head-on collision an escape ramp escape ramps have been built on many steep mountain downgrades escape ramps are made to stop runaway vehicles safely without entering drivers and passengers escape ramps use a long bed of loose a soft material to slow a runaway vehicle sometimes in combination with an upgrade if a tire blows out you should put the brakes on hard to stop quickly true or false false stay off the brakes it's natural to want to brake in an emergency however braking when a tire has failed can cause loss of control unless you're about to run into something stay off the brakes until the vehicle has slowed down then brake very gently pull off the road and stop how do you know if your vehicle has anti-lock brakes tractors trucks and buses will have yellow ABS malfunction lamps on the instrument panel trailers will have yellow ABS malfunction lamps on the left side either on the front or rear corner what is proper braking technique when driving a vehicle with anti-lock brakes brake the same way regardless of whether you have ABS on the bus tractor the trailer or both how do anti-lock brakes help you brake pressure is adjusted to provide the maximum braking without danger of lockup ABS works far faster than the driver can respond to potential will lockup at all other times the brake system will operate normally on brake rotors apply their power whenever you let up all the way on the accelerator pedal what is the minimum number of tie downs that you should have you should have at least two tie downs should you turn your retarders off when the road is wet or snow-covered yes the retarders could cause your vehicle to skid slight melting will make ice wet what is more slippery what ice is more slippery at dawn or dusk or in rain or snow when it is difficult for other drivers to see you you might turn on your low beam headlights since air pressure increases with temperature increases you should leave the warm tires alone since the air pressure will decrease when the tires cool off speed limits that are posted at freeway off-ramps may not be save speeds for larger vehicles or heavily loaded vehicles how do you test hydraulic brakes for a leak with a vehicle stopped pump the brake pedal three times then apply firm pressure then hold for five seconds when merging with other traffic you should use your mirrors to make sure the gap and the traffic is large enough for you to enter what are some steering system defects to look for missing nuts bolts Cotter keys or other parts besides watching the traffic behind you you should use your rear view mirrors to watch for possible tire fires good policy for using your brakes when pulling off the road try to avoid using your brakes until your speed has dropped to about 20 miles per hour should you always be looking into the distance ahead no shift your attention back and forth near and far at night in order to avoid the glare of oncoming traffic what is a good direction to look look at the right side of the road and watch the sidelines why can't you assume your vehicle will clear the posted height at an overpass because some roads might not be level and could cause your vehicle to tilt how much time does it take to stop a heavy vehicle going 55 miles per hour on a dry level Road about the length of a football field or about six seconds you want to turn right and must swing wide you should turn wide as you complete the turn some newer vehicles have progressive shifting which means the RPMs at which you shift become higher as you move up in the gears rust around lug nuts may indicate that the lug nuts are loose hence the wheel may be loose if the vehicle and oncoming traffic is approaching you with as high beams on you should keep your low beams on don't turn on your high beams and look at the right side of the road until the vehicle passes you what are some things to do and an accident scene to prevent another accident protect the area notify authorities and care for the injured name too causes of tire fires under inflated tires and duals that touch what kinds of fires is a B C extinguisher not good for wood paper and ordinary combustibles fires in combustible metals note the extinguishers are for use on fires involving gasoline oil grease or other greasy liquids and C extinguishers are for use on electrical equipment fires when using your extinguisher should you get as close as possible to the fire no you should stay as far away as possible name some causes of vehicle fires filled fuel improper use of flares flammable cargo what should you consider about downshifting before you reach a long downhill grade downshifting helps prevent the brakes from overheating and from losing braking power whether backing a straight truck or a combination vehicle you should back and turn toward the driver's side how often should you check your tires when driving in very hot weather check them every two hours or every 100 miles because of your vehicle's large size you may wish to flesh your brake lights to alert drivers behind you of hazards that you see ahead what is the purpose of brake retarders they help slow the vehicle and reduce brake wear when driving at night what rule should you follow be ready to stop within the range of your headlights downshifting requires knowing when to shift to do this correctly you should use the Tekamah and/or speedometer in making a quick turn what should you remember don't apply the brakes while turning how do you reduce the odds of having to make a sudden move to avoid a hazard watch far enough ahead so you can anticipate a potential hazard roads usually become more slippery when the temperature has increased to the point where ice begins to melt common medicines for codes can make you sleepy true or false true avoid medication many medicines can make you sleepy those that do have a label warning against operating vehicles or machinery the most common medicine of this type is the ordinary cold pill if you have to drive with a cold you are better off suffering from the cold than from the effects of the medicine coffee and a little fresh air will help a drinker sober up true or false false the liver can only process one third of an ounce of alcohol per hour which is considerably less than the alcohol and a standard drink this is a fixed rate so only time not black coffee or a cold shower or sober you up what is a has material placard backwards are signs put on the outside of a vehicle that identify the hazardous class of the cargo a placard vehicle must have at least four identical placards they are put in front rear and both sides placards must be readable from all four directions why are placards used the intent of the rule is to contain the product communicate the risk and ensure safe drivers and equipment you

2 thoughts on “2019 CDL General Knowledge Exam Practice Study Questions & Answers 20190718”

  1. Amazing work thank you for pulling the answers off the manual and giving us better detail along with the questions, thank you Barry for your time! This should definitely get Me to pass and will keep you informed once I have passed

  2. For dear life, I can't pass my air break endorsement. I have read the section on air breaks already. Any suggestions??

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