Download CDL 150 QUESTIONS GENERAL KNOWLEDGE QUESTIONS WITH ACCURATE ANSWERS and more Exams Logistics in PDF only on Docsity!
CDL 150 QUESTIONS GENERAL KNOWLEDGE QUESTIONS WITH
ACCURATE ANSWERS
As the blood alcohol concentration (BAC) goes up, what happens? A. the drinker more clearly sees how alcohol is affecting him/her. B. the effects of alcohol decrease. C. judgment and self control are affected. correct answer C. judgment and self control are affected. Implied consent means A. It is understood that you may drink alcohol now and then. B. you have given your consent to be tested for alcohol in your blood. C. you have given your consent to inspection of your vehicle for alcohol. correct answer B. you have given your consent to be tested for alcohol in your blood. The total weight of the powered unit, the trailer, and the cargo is called. A. gross vehicle weight. B. gross combination weight. C. gross axle weight. correct answer B. gross combination weight. If you do not have a CB radio, what is the 1st thing you should do at an accident scene? A. protect the area. B. notify authorities C. care for the injured. correct answer A. protect the area. Which of these is true about mirror adjustment? A. you should adjust your mirrors prior to starting a trip. B. you can adjust your mirrors while driving. C. the mirrors can adjusted adjusted correctly even if the trailer is not straight. correct answer A. you should adjust your mirrors prior to starting a trip.
Brake fade: A. can be caused by the brakes getting very hot. B. can be corrected by letting up on the brakes for 1 or 2 seconds and then reapplying them. correct answer A. can be caused by the brakes getting very hot. On which fires can water be used? A. electrical B. gasoline C. tires correct answer C. tires Which of these statements about engine overheating is true? A. you should never shut off an overhead engine until it has cooled. B. you should never remove the radiator cap on a pressurized system until it has cooled. C. antifreeze is not needed when the weather is warm. correct answer B. you should never remove the radiator cap on a pressurized system until it has cooled. Which of these is not a danger of rough acceleration? A. tire damage B. mechanical damage. C. damage to the coupling. correct answer A. tire damage Which of these is true about the use of a heater? A. when driving in winter weather, you should check the heather is working properly. B. you must have at least 1 extra heater, such as a mirror heater or bunk heater, when driving in winter weather. C. if you feel sleepy, warming the cab with the heater will help you stay alert. correct answer A. when driving in winter weather, you should check the heather is working properly. What is the proper way to hold the steering wheel? A. with both hands close together, at the top of the wheel.
Which of these is the proper way to signal to change lanes? A. signal just as you begin to change lanes and drift over slowly. B. signal early and change lanes slowly and smoothly. C. signal before you change lanes and then move over quickly. correct answer B. signal early and change lanes slowly and smoothly. You should signal continuously while turning because; A. you need both hands on the wheel to turn safely. B. it is illegal to turn off your signal before completing a turn. C. most vehicles have self canceling signals. correct answer A. you need both hands on the wheel to turn safely. The primary cause of fatal crashes is: A. driving too fast. B. driving while eating. C. driving at night. correct answer A. driving too fast. You should try to park so that: A. you can pull forward when you leave. B. there is at least 1 curb next to your vehicle. C. your vehicle is protected by trees or some other overhang. correct answer A. you can pull forward when you leave. You are driving a vehicle at 45 mph on dry pavement. About how much total stopping distance will you need to bring it to a stop? A. twice the length of the vehicle. B. half the length of a football field. C. the length of a football field. correct answer C. the length of a football field. When driving at night , you should use your low beans when an oncoming vehicle is within:
A. 300 ft B. 400 ft C. 500 ft correct answer C. 500 ft You are driving in an area with few streetlights on a clear night. If you cannot see well with your headlights, which of these actions would help? A. turn your interior light on and adjust your instruments light up. B. find another route that is better lit, even if it is out of the way. C. use your high beams when legal and keep your interior light off. correct answer C. use your high beams when legal and keep your interior light off. What happens to tar in road pavement when it gets extremely hot? A. it becomes gummy, making tires stick to the road. B. it bleeds, making the road surface slippery. C. nothing; it is made for hot weather. correct answer B. it bleeds, making the road surface slippery. What is the best advice for drivers when a heavy fog occurs? A. park at a truck stop or rest area until the fog has lifted. B. do not drive too slowly, or other drivers may hit you. C. alternate your low and high beams to improve your vision. correct answer A. park at a truck stop or rest area until the fog has lifted. Which of these statements about cold weather driving is true? A. an engine cannot overheat when the weather is very cold. B. windshield washer antifreeze should be used. C. exhaust system leaks are less dangerous in the cold. correct answer B. windshield washer antifreeze should be used. Strong winds most affect driving: A. around sharp curves
In the event of a rear tire failure, dual rear tires: A. may prevent vibration or thumping. B. will usually prevent fishtailing C. will allow you to brake immediately. correct answer B. will usually prevent fishtailing Which of these is correct about emergency or evasive action? A. stopping is always the safest thing to do in an emergency. B. in order to turn quickly you must have a firm grip on the steering wheel. C. you can usually stop more quickly than you can turn to miss an obstacle. correct answer B. in order to turn quickly you must have a firm grip on the steering wheel. Most serious skids result from: A. turning too sharply. B. an uneven load. C. driving too fast for conditions. correct answer C. driving too fast for conditions. Over length, over width, or over weight loads A. must be escorted by police. B. require a special transit permit. C. can only be driven in daylight. correct answer B. require a special transit permit. Containerized loads: A. should come with their own tie down devices or locks. B. are generally used when freight is carried part way by rail or ship. C. do not require inspection or securing the driver. correct answer B. are generally used when freight is carried part way by rail or ship. Which of these statements about an inspection of suspension components is true?
A. distorted coil springs are safe as long as they are not broken. B. axle mounts should be checked at each point where they are secured on the vehicle frame and axle. C. suspension components should be checked on all axles except for the power unit. correct answer B. axle mounts should be checked at each point where they are secured on the vehicle frame and axle. Should brake adjustment be checked often? A. yes, because brakes can get out of adjustment when they are used a lot. B. it depends on how new the brakes are. C. no, because the other brakes will make up for a brake that is out of adjustments. correct answer A. yes, because brakes can get out of adjustment when they are used a lot. Which of these is NOT part of the pre-tip inspection of the engine compartment? A. engine oil level. B. valve clearance. C. worn electrical wiring insulation. correct answer B. valve clearance. A full stop is required at a railroad grade crossing when: A. the nature of the cargo makes a stop mandatory under state, or for incompatible items. B. the crossing is located in a city or town with frequent train traffic. C. there are no flagmen, warning signals, or gates at the crossing. correct answer A. the nature of the cargo makes a stop mandatory under state, or for incompatible items. You do NOT have a Hazard Materials Endorsement on your commercial driver's license. You can drive a vehicle hauling hazardous materials when: A. the GVWR is 26,001 or less B. the vehicle does not require placards. C. a person who has the Hazardous Materials Endorsement rides with you. correct answer B. the vehicle does not require placards.
Which of these statements about staying alert to drive is true? A. a half hour coffee break will do more to overcome fatigue than a half hour nap. B. if you. must stop to take a nap, it should be at a truck stop or rest area, never on the side of the road. C. sleep if the only thing that can overcome fatigue. correct answer C. sleep if the only thing that can overcome fatigue. Medicines used to treat the common cold: A. can still be used while driving if you only take half the dose. B. should only be used when driving in the daytime. C. often makes you drowsy and thus should not be used while driving. correct answer C. often makes you drowsy and thus should not be used while driving. Which of these statements about drugs is true? A. a driver can use any prescription drug while driving. B. use of drugs can lead to accidents and/or arrest. C. certain prescription drugs are allowed to reduce fatigue. correct answer B. use of drugs can lead to accidents and/or arrest. Which of these statements about causes of vehicle fires is true? A. under inflated tires will not cause a fire. B. carrying a properly charged fire extinguisher will help prevent a fire. C. poor trailer ventilation can cause cargo to catch on fire. correct answer C. poor trailer ventilation can cause cargo to catch on fire. What will help keep an engine cool in hot weather? A. driving faster to force more air into the radiator. B. running the air conditioner. C. making sure the engine has the right amount of oil. correct answer C. making sure the engine has the right amount of oil.
Which of these statements about marking a stopped vehicle is true? A. if a hill or curve keeps others from seeing the vehicle within 500 feet, the rear triangle should be moved back down the road to give adequate warning. B. the vehicle's taillights should be kept on to warn other drivers. C. you must put out you warning devices within 5 minutes. correct answer A. if a hill or curve keeps others from seeing the vehicle within 500 feet, the rear triangle should be moved back down the road to give adequate warning. Which of these do not provide extra gears on some trucks? A. automatic transmissions. B. auxiliary transmissions. C. multi-speed rear axles. correct answer A. automatic transmissions. Which of these actions is not recommended for a left turn? A. use the right lane if there are 2 turning lanes. B. start your turn from the center of the intersection. C. start in the inside lane and swing right as you turn. correct answer C. start in the inside lane and swing right as you turn. What is counter steering? A. turning the wheel counter clockwise. B. using the steering axle brakes to prevent over steering. C. turning the wheel back in the opposite direction after steering to avoid an emergency. correct answer C. turning the wheel back in the opposite direction after steering to avoid an emergency. Which of these statements about downshifting is true? A. when you downshift for a curve, you should do so before you enter the curve. B. when double clutching, you should let the RPM's decrease while the clutch is released and the truck is in neutral. C. when you downshift for a curve, you should do so after you enter the curve. correct answer A. when you downshift for a curve, you should do so before you enter the curve.
When you are driving on a snow packed road you should reduce your speed by at least: A. 1/ B. 1/ C. 1/2 correct answer C. 1/ Merging onto a road is safest if you: A. Inch over into the nearest lane so that other vehicles will give you room B. gain speed on the shoulder and then merge C. wait for a large enough gap in traffic to enter the road correct answer C. wait for a large enough gap in traffic to enter the road If you are being tailgated, you should: A. flash your brake lights. B. increase your following distance. C. signal the tailgater when it is safe to pass. correct answer B. increase your following distance. What should you do if a car coming toward you at night keeps its high beams on? A. flash your high beams at the other driver. B. look at the right side of the road. C. slow down and look straight ahead in your lane. correct answer B. look at the right side of the road. The road you are traveling on becomes very slippery due to glare ice. Which of these is a good thing to do in such a situation? A. stop driving as soon as you can safely do so. B. down shift to stop. C. keep varying your speed by accelerating and braking. correct answer A. stop driving as soon as you can safely do so. Your brakes can get wet when driving through heavy rain. What can happen if the brakes are applied? A. hydroplaning.
B. excessive brake wear. C. trailer jackknife. correct answer C. trailer jackknife. You should avoid driving through deep puddles or flowing water. But if you must, which of these steps can help keep your brakes working? A. applying hard pressure on both the brake pedal and accelerator after coming out of the water. B. gently putting on the brakes while driving through the water. C. turning on your brake heaters. correct answer B. gently putting on the brakes while driving through the water. When driving through work zones should: A. reduce speed only if workers are close to the roadway. B. stop quickly and pull to the side of the road. C. use your 4- way flashers or brake lights to warn others. correct answer C. use your 4- way flashers or brake lights to warn others. The best drivers are those that watch and prepare for hazards. This is called being: A. offensive. B. defensive. C. objective. correct answer B. defensive. Which of the below is not a characteristics of a front tire failure? A. steering wheel twisting. B. vehicle fishtail. C. difficult steering. correct answer B. vehicle fishtail. When hydraulic brakes fail while driving, what action should you take? A. push down the brake pedal as hard as you can. B. pump the brake pedal to generate pressure.
Which of these statements about tires is true? A. you should inspect your tires every 2 hours or every 100 miles when driving in hot weather. B. the air pressure of a tire decreases as the temperature of the tire increases. C. if the tires are too hot to touch, let 5-10 pounds of air out to cool them. correct answer A. you should inspect your tires every 2 hours or every 100 miles when driving in hot weather. If you are not sure what to use to put out hazardous materials fires, you should: A. use water. B. use dirt. C. wait on qualified firefighters. correct answer C. wait on qualified firefighters. When you are driving on grades, which of these is the best way to choose a safe speed? A. if you have a light load, you can go faster than those with a heavy load. B. based on your vehicle and its cargo, select a safe speed that is within the posted speed limit. C. follow the vehicle in front of you. correct answer B. based on your vehicle and its cargo, select a safe speed that is within the posted speed limit. When confronted by an aggressive driver, the very first thing you should do is: A. make every attempt to get out of their way. B. maintain your position. correct answer A. make every attempt to get out of their way. In bad weather, many cars tailgate large vehicles. What should you do? A. speed up to distance yourself from the tailgater. B. increase your following distance so you can avoid quick maneuvers. C. lightly tap your brakes to warn the tailgater to back off. correct answer B. increase your following distance so you can avoid quick maneuvers. Which of these is a good thing to remember about drinking alcohol? A. the driver can control how fast the body gets rid of alcohol. B. small quantities of alcohol increase reaction time.
C. alcohol affects judgment and self control, which are necessary for safe driving. correct answer C. alcohol affects judgment and self control, which are necessary for safe driving. Which of these statements about vehicle fires is true? A. if a cargo van catches fire, you should open the doors as soon as you can. B. if you engine is on fire, you should open the hood as soon as you can. C. a burning tire should be cooled with water. correct answer C. a burning tire should be cooled with water. Optional safety equipment may include emergency phone numbers, tire chains and: A. tire changing equipment B. red reflective triangles C. charged fire extinguisher. correct answer A. tire changing equipment After starting the engine: A. the coolant temperature gauge should begin a gradual rise to the normal range. B. the oil pressure gauge should 3-5 minutes to rise to normal. C. the engine temperature gauge should rise to normal within seconds. correct answer A. the coolant temperature gauge should begin a gradual rise to the normal range. Retarders can be used: A. only for downhill braking. B. only where permitted by law. C. only on roads with poor traction. correct answer B. only where permitted by law. Which of these statements about brakes is true? A. the heavier a vehicle or the faster it is moving the more heat the brakes have to absorb to stop it. B. brake drums cool very quickly when the vehicle is moving very fast. C. brake fade is not caused by hear. correct answer A. the heavier a vehicle or the faster it is moving the more heat the brakes have to absorb to stop it.
B. it doesn't, brakes work the same regardless of the weight of the vehicle. C. fully loaded trucks takes longer to stop than empty trucks. correct answer A. empty trucks can take longer to stop than loaded ones, but this is usually not the case for buses. Which of these statements about overheard clearance is true? A. you should assume posted clearance signs are correct. B. the weight of a vehicle changes its height. C. if the road surface causes your vehicle to tilt toward objects at the edge, you should drive near the shoulder. correct answer B. the weight of a vehicle changes its height. Which of these is a good thing to do when driving at night? A. keep your speed slow enough that you can stop in the range of your headlights. B. look directly at oncoming lights only briefly. C. keep your instrument panel lights bright. correct answer A. keep your speed slow enough that you can stop in the range of your headlights. Which vehicle will be most affected by strong winds? A. N/A B. a set of empty doubles. C. a straight truck with cargo. correct answer B. a set of empty doubles. When the roads are slippery, you should: A. make turns as gently as possible. B. stop and test the traction while going up hill. C. decrease the distance you look ahead of your vehicle. correct answer A. make turns as gently as possible. Which of these is not true about emergency braking? A. you should brake in a way that will keep your vehicle in a straight line. B. it is not important how you brake in and emergency.
C. you should avoid using the brakes until your speed is down to 20 MPH. correct answer B. it is not important how you brake in and emergency. Which of these is the most important thing to remember about emergency braking? A. disconnecting the steering axle brakes will keep your vehicle in a straight line. B. if the wheels are skidding you cannot control your vehicle. C. never do it without downshifting first. correct answer B. if the wheels are skidding you cannot control your vehicle. Where or how is cargo blocking used A. loosely around the cargo B. from the upper part of the cargo to the floor C. in the front, sides, and back of cargo, usually at the floor correct answer C. in the front, sides, and back of cargo, usually at the floor Bridge formulas: A. permit less maximum axle weight for axles that are closer together. B. permit less maximum axle weight for axles that father apart. C. permit the same axle weight for any axle spacing. correct answer A. permit less maximum axle weight for axles that are closer together. You are checking your brakes and suspension system for a pre trip inspection. Which of these statements is true? A. just one missing leaf spring is not dangerous. B. spring hangers that are cracked are not dangerous. C. brake shoes should not have oil, grease, or fluid on them. correct answer C. brake shoes should not have oil, grease, or fluid on them. What is the most important reason to inspect your truck or bus? A. safety. B. it's the law.
