Home > Common Errors

  • 5075   What is counter steering?... Answer
  • 4988   Why should drivers put the starter switch key in your pocket during th... Answer
  • 3401   The most common type of foundation brakes found on heavy vehicles is t... Answer
  • 3181   The safety catch for the fifth wheel locking lever must be ____ for a ... Answer
  • 2779   Which of the following is the correct term for a long commercial vehic... Answer
  • 2703   To avoid a crash, you had to drive onto the right shoulder. You are no... Answer
  • 2630   Normal oil pressure while idling is:... Answer
  • 2599   When is it required for the driver to have an approved gas mask?... Answer
  • 2595   Driving a 100 foot twin trailer combination at 50 mph on a dry road in... Answer
  • 2589   You should decrease your following distance if somebody is following y... Answer
  • 2565   A moving vehicle ahead of you has a red triangle with and orange cente... Answer
  • 2535   The braking power of the spring brakes:... Answer
  • 2406   If you are being tailgated, you should:... Answer
  • 2317   How many red reflective triangles should you carry?... Answer
  • 2308   Fanning air brakes:... Answer
  • 2287   The crack and whip effect is a major hazard for trucks with trailers. ... Answer
  • 2276   When checking the free play of manual slack adjusters on s-cam brakes,... Answer
  • 2251   Which one of these shipping paper discriptions for a hazardous materia... Answer
  • 2210   If your truck or bus has dual parking control valves, it means that yo... Answer
  • 2193   Which of these is a good rule to follow when using a fire extinguisher... Answer
  • 2190   When a substance in the materials table is written in italics, it mean... Answer
  • 2169   Liquid tight separations between compartments inside tanks are called:... Answer
  • 2132   You find an overheated tire during an enroute inspection. If you are h... Answer
  • 2110   These horizontal yellow lines indicate:... Answer
  • 2055   Normal engine temperature ranges from:... Answer
  • 1956   If a materials class is the word FORBIDDEN, what kinds of materials ar... Answer
  • 1904   If you try to downshift while coming down a mountain, you might:... Answer
  • 1895   Which of these statements about double clutching and shifting is true?... Answer
  • 1872   If you have a major leak in the service line and you put on the brakes... Answer
  • 1857   Which is true regarding bridge laws?... Answer
  • 1846   You are driving a 40-foot vehicle at 35 mph. Driving conditions are on... Answer
  • 1823   Why should you back toward the driver's side?... Answer
  • 1823   How can you test the low pressure warning signal?... Answer
  • 1767   To ensure air is supplied to the second trailer on a combination vehic... Answer
  • 1761   How much longer can you drive for unexpected adverse driving condition... Answer
  • 1751   When your cargo tank has baffles, what handling effect do you expect?... Answer
  • 1749   When a coolant container is part of a pressurized system, you can:... Answer
  • 1728   The hazardous waste manifest should be:... Answer
  • 1724   Which of the following statements about large trucks is false?... Answer
  • 1703   During the 14 consecutive hour duty period, you are allowed to drive y... Answer
  • 1696   Describe the proper braking technique when going down a long steep dow... Answer
  • 1682   You do not have a hazardous materials endorsement on your commercial d... Answer
  • 1665   What does progressive shifting mean?... Answer
  • 1642   What type of fire extinguisher is required in the power unit of a plac... Answer
  • 1611   In normal driving, some drivers use the hand valve before applying the... Answer
  • 1587   The parking brake should be tested while the vehicle is:... Answer
  • 1585   If the air compressor leakes, which mechanism keeps the air in the tan... Answer
  • 1580   When should you downshift automatic transmissions?... Answer
  • 1580   Which of these statements about stopping distance and speed is true fo... Answer
  • 1574   Three things add up to the total stopping distance for your vehicle. T... Answer
  • 1571   When making emergency stops with air brakes and using the stab braking... Answer
  • 1544   When you are not sure who has the right-of-way, the safest course of a... Answer
  • 1543   You are checking your tires for a pre-trip inspection. Which of these ... Answer
  • 1528   Separations (between compartments inside tanks that have openings or h... Answer
  • 1484   When you are parked at the side of the road at night, you must:... Answer
  • 1472   When fueling a placarded vehicle, someone must always be:... Answer
  • 1465   Liquid in a tank with baffles can have what kind of surge?... Answer
  • 1465   Which of the following statements is true about overhead clearance?... Answer
  • 1450   For combination vehicles, when the front trailer supports are up and t... Answer
  • 1447   You should be extremely cautious when driving smooth bore tankers, esp... Answer
  • 1433   The air leakage rate for a combination vehicle (with engine off and br... Answer
  • 1419   The air compressor governor controls:... Answer
  • 1411   Outage means:... Answer
  • 1406   This is the part of the kingpin that the locking jaws should close aro... Answer
  • 1386   You should know that your brakes are fading when:... Answer
  • 1382   If the driver crosses the air lines when hooking up to an old trailer:... Answer
  • 1363   Some large trucks have convex or spot mirrors, which:... Answer
  • 1352   A steady yellow light at an intersection means you must:... Answer
  • 1350   Which of these is a good rule to follow when using a fire extinguisher... Answer
  • 1348   Overloading your trailer can result in the following EXCEPT:... Answer
  • 1332   How far ahead should you look when driving a truck?... Answer
  • 1311   What should wheel bearing seals be checked for?... Answer
  • 1309   With a Class C drivers license a person may drive:... Answer
  • 1307   What is a supply pressure gauge used for?... Answer
  • 1298   You need to be extremely cautious when driving smooth bore tankers. Th... Answer
  • 1295   When driving down a long steep hill, you should:... Answer
  • 1286   If the trailer breaks away from a combination vehicle, pulling apart b... Answer
  • 1275   You are driving a new truck with a manual transmission. What gear will... Answer
  • 1270   Baffles in liquid cargo tanks do not usually prevent the movement of s... Answer
  • 1245   Which of these about emergency steering of tankers is true?... Answer
  • 1245   You should plan ahead when you park your vehicle so that:... Answer
  • 1241   The amount of liquid to load into a tank depends on:... Answer
  • 1231   Converter dollies:... Answer
  • 1203   Which of these statements is correct about seeing ahead?... Answer
  • 1201   When driving on a clear night, you must dim your headlights from high ... Answer
  • 1188   If heavy fog appears, you should:... Answer
  • 1158   You are driving a 40 foot vehicle at 45mph. Driving conditions are ide... Answer
  • 1153   When coupling a tractor to a semi trailer and have backed up but are n... Answer
  • 1146   Front wheel brakes work well in all conditions.... Answer
  • 1129   In the event of an accident you should remember to do the following EX... Answer
  • 1112   After 33 consecutive hours off-duty, you may legally restart your 60 o... Answer
  • 1111   Retarders prevent you from skidding on slippery surfaces.... Answer
  • 1091   Empty tanker trucks:... Answer
  • 1087   A vehicle is loaded with very little weight on the drive axle. What ma... Answer
  • 1065   Before backing under a trailer, make sure:... Answer
  • 1055   You should check the height of the trailer before connecting a convert... Answer
  • 1052   The term Gross Combination Weight refers to:... Answer
  • 1046   Air loss in a straight truck or bu should not be more than ______ with... Answer
  • 1035   If oil and water collect in the air tanks, wha tcan happen to the brak... Answer
  • 1034   What are two special conditions where you should downshift?... Answer