Home > Common Errors

  • 4299   Why should drivers put the starter switch key in your pocket during th... Answer
  • 4287   What is counter steering?... Answer
  • 2916   The most common type of foundation brakes found on heavy vehicles is t... Answer
  • 2490   Which of the following is the correct term for a long commercial vehic... Answer
  • 2465   The safety catch for the fifth wheel locking lever must be ____ for a ... Answer
  • 2388   The braking power of the spring brakes:... Answer
  • 2388   Driving a 100 foot twin trailer combination at 50 mph on a dry road in... Answer
  • 2342   When is it required for the driver to have an approved gas mask?... Answer
  • 2328   To avoid a crash, you had to drive onto the right shoulder. You are no... Answer
  • 2319   Normal oil pressure while idling is:... Answer
  • 2244   If you are being tailgated, you should:... Answer
  • 2187   You should decrease your following distance if somebody is following y... Answer
  • 2080   The crack and whip effect is a major hazard for trucks with trailers. ... Answer
  • 2047   Which one of these shipping paper discriptions for a hazardous materia... Answer
  • 2041   When checking the free play of manual slack adjusters on s-cam brakes,... Answer
  • 2029   Fanning air brakes:... Answer
  • 1982   How many red reflective triangles should you carry?... Answer
  • 1975   When a substance in the materials table is written in italics, it mean... Answer
  • 1969   Liquid tight separations between compartments inside tanks are called:... Answer
  • 1936   If your truck or bus has dual parking control valves, it means that yo... Answer
  • 1929   Which of these is a good rule to follow when using a fire extinguisher... Answer
  • 1891   These horizontal yellow lines indicate:... Answer
  • 1838   A moving vehicle ahead of you has a red triangle with and orange cente... Answer
  • 1828   You find an overheated tire during an enroute inspection. If you are h... Answer
  • 1759   Normal engine temperature ranges from:... Answer
  • 1724   If a materials class is the word FORBIDDEN, what kinds of materials ar... Answer
  • 1675   If you try to downshift while coming down a mountain, you might:... Answer
  • 1661   Why should you back toward the driver's side?... Answer
  • 1653   If you have a major leak in the service line and you put on the brakes... Answer
  • 1629   How can you test the low pressure warning signal?... Answer
  • 1620   Which is true regarding bridge laws?... Answer
  • 1584   When your cargo tank has baffles, what handling effect do you expect?... Answer
  • 1573   To ensure air is supplied to the second trailer on a combination vehic... Answer
  • 1563   Which of the following statements about large trucks is false?... Answer
  • 1561   How much longer can you drive for unexpected adverse driving condition... Answer
  • 1538   Describe the proper braking technique when going down a long steep dow... Answer
  • 1520   During the 14 consecutive hour duty period, you are allowed to drive y... Answer
  • 1517   The hazardous waste manifest should be:... Answer
  • 1479   What does progressive shifting mean?... Answer
  • 1465   When a coolant container is part of a pressurized system, you can:... Answer
  • 1463   In normal driving, some drivers use the hand valve before applying the... Answer
  • 1461   What type of fire extinguisher is required in the power unit of a plac... Answer
  • 1457   You are driving a 40-foot vehicle at 35 mph. Driving conditions are on... Answer
  • 1436   If the air compressor leakes, which mechanism keeps the air in the tan... Answer
  • 1434   When should you downshift automatic transmissions?... Answer
  • 1431   You do not have a hazardous materials endorsement on your commercial d... Answer
  • 1418   Three things add up to the total stopping distance for your vehicle. T... Answer
  • 1399   When making emergency stops with air brakes and using the stab braking... Answer
  • 1379   Which of these statements about stopping distance and speed is true fo... Answer
  • 1378   When you are not sure who has the right-of-way, the safest course of a... Answer
  • 1365   Separations (between compartments inside tanks that have openings or h... Answer
  • 1322   For combination vehicles, when the front trailer supports are up and t... Answer
  • 1321   The air leakage rate for a combination vehicle (with engine off and br... Answer
  • 1313   The parking brake should be tested while the vehicle is:... Answer
  • 1295   You should be extremely cautious when driving smooth bore tankers, esp... Answer
  • 1293   Liquid in a tank with baffles can have what kind of surge?... Answer
  • 1276   A steady yellow light at an intersection means you must:... Answer
  • 1274   When fueling a placarded vehicle, someone must always be:... Answer
  • 1266   The air compressor governor controls:... Answer
  • 1249   Outage means:... Answer
  • 1249   This is the part of the kingpin that the locking jaws should close aro... Answer
  • 1228   If the driver crosses the air lines when hooking up to an old trailer:... Answer
  • 1223   You should know that your brakes are fading when:... Answer
  • 1211   Some large trucks have convex or spot mirrors, which:... Answer
  • 1198   How far ahead should you look when driving a truck?... Answer
  • 1193   Overloading your trailer can result in the following EXCEPT:... Answer
  • 1190   Which of these statements about double clutching and shifting is true?... Answer
  • 1186   With a Class C drivers license a person may drive:... Answer
  • 1179   When you are parked at the side of the road at night, you must:... Answer
  • 1170   Which of these is a good rule to follow when using a fire extinguisher... Answer
  • 1162   If the trailer breaks away from a combination vehicle, pulling apart b... Answer
  • 1154   You need to be extremely cautious when driving smooth bore tankers. Th... Answer
  • 1145   When driving down a long steep hill, you should:... Answer
  • 1141   What is a supply pressure gauge used for?... Answer
  • 1134   You should plan ahead when you park your vehicle so that:... Answer
  • 1125   The amount of liquid to load into a tank depends on:... Answer
  • 1119   Baffles in liquid cargo tanks do not usually prevent the movement of s... Answer
  • 1099   Which of these about emergency steering of tankers is true?... Answer
  • 1073   When driving on a clear night, you must dim your headlights from high ... Answer
  • 1071   Converter dollies:... Answer
  • 1069   If heavy fog appears, you should:... Answer
  • 1068   Which of the following statements is true about overhead clearance?... Answer
  • 1042   Which of these statements is correct about seeing ahead?... Answer
  • 1015   When coupling a tractor to a semi trailer and have backed up but are n... Answer
  • 1008   What should wheel bearing seals be checked for?... Answer
  • 1000   Empty tanker trucks:... Answer
  • 999   You are driving a new truck with a manual transmission. What gear will... Answer
  • 977   Front wheel brakes work well in all conditions.... Answer
  • 974   Retarders prevent you from skidding on slippery surfaces.... Answer
  • 973   You are checking your tires for a pre-trip inspection. Which of these ... Answer
  • 965   Before backing under a trailer, make sure:... Answer
  • 956   In the event of an accident you should remember to do the following EX... Answer
  • 945   You are driving a 40 foot vehicle at 45mph. Driving conditions are ide... Answer
  • 944   How many hours can a truck driver drive in Alaska?... Answer
  • 939   What are two special conditions where you should downshift?... Answer
  • 936   After 33 consecutive hours off-duty, you may legally restart your 60 o... Answer
  • 929   The term Gross Combination Weight refers to:... Answer
  • 927   You should check the height of the trailer before connecting a convert... Answer
  • 921   Air loss in a straight truck or bu should not be more than ______ with... Answer
  • 911   What are the three maximum duty Limits at all times?... Answer