| 930 When a tractor and a trailer are coupled, how much space should there ... Answer766 When inspect the coupling, you must make certain that there is enough ... Answer737 In what position should the air line shut off valves be when you check... Answer693 The air tanks on trailers and converter dollies are filled by:... Answer664 The emergency air line for:... Answer661 In order to supply air to the trailer, you must first:... Answer568 Which one of the following statements about tractor protection valves ... Answer563 The maximum air released when brakes are released is:... Answer550 The service air line is controlled by... Answer534 What is the emergency air line?... Answer501 For the coupling to be complete for a fifth wheel with a locking lever... Answer461 Other names for the Service Air Lines are?... Answer461 Why should you use chocks when parking a trailer without spring brakes... Answer430 You are driving a combination vehicle when the trailer brakes away, pu... Answer429 After applying brakes fully max on combination vehicles, what is the a... Answer422 If you cross connect the two air lines the following will result:... Answer413 The service line is for:... Answer413 What should the trailer height be before you connect a converter dolly... Answer398 Before you back under a semi-trailer in coupling your tractor at what ... Answer384 When you turn suddenly while pulling doubles, which trailer is most li... Answer380 Are fully loaded rigs more likely to roll over in a crash than empty r... Answer373 Why do large combination vehicles that are empty take longer to stop t... Answer352 The function of the trailer air supply control is:... Answer343 A combination vehicle air brake system should not lose air faster than... Answer342 In order to inspect the coupling you should:... Answer311 The trailer hand valve should be used:... Answer303 You should swing wide to the left before starting a 90 degree turn:... Answer303 Which of the following statements about combination vehicles is true?... Answer302 Coupling and uncoupling methods are the same for more common tractor-t... Answer294 More than half of truck driver deaths in crashes are the result of tru... Answer284 Why should you check your mirrors whenever you apply the brakes hard?... Answer284 When should you use the hand valve to park a combination vehicle?... Answer277 A device which connects the service and emergency air lines from the t... Answer276 Off tracking is:... Answer271 To prevent rollovers, remember to:... Answer268 Why should you not use the trailer hand brake to straighten out a jack... Answer262 What are some things that you can do to avoid getting surprised and ha... Answer261 When backing a tractor under a trailer, you should expect:... Answer258 When coupling the trailer, back up slowly until:... Answer253 If you start a trailer skid, you should:... Answer252 When coupling the glad hands, you should NOT do the following:... Answer247 You have connected the air lines but have not yet backed under the tra... Answer243 Since a sudden movement with your steering wheel can tip a trailer ove... Answer239 Large combination vehicles take longer to stop:... Answer217 What tells how much pressure the relay valves should send to the trail... Answer216 The earliest way to notice a trailer skid is:... Answer213 Semi trailers made before 1975 that are equipped with air brakes:... Answer212 What two things can a driver do to prevent rollovers?... Answer209 A trailer jackknife is:... Answer209 After you lock the kingpin into the fifth wheel how can you check the ... Answer206 Which is true when rolling up the landing gear to complete the couplin... Answer205 You should use different methods for uncoupling second and third trail... Answer204 Which one of the following is controlled by the foot brake?... Answer202 When traveling under 40 mph, you should follow other vehicles:... Answer198 You should crank the landing gear until:... Answer196 You should not back a tractor under a trailer until the whole air syst... Answer185 You have coupled with a semi trailer. In what position should you put ... Answer182 Before you back under the trailer, you should be sure that the trailer... Answer178 Before driving away, how can you always test the trailer brakes?... Answer168 If you will be pulling doubles where one trailer is more heavily loade... Answer164 The fifth wheel locking lever is not locked after the jaws close aroun... Answer164 Why should you lock the tractor gland hands (or dummy couplers) to eac... Answer157 You should not use the trailer hand valve while driving because:... Answer143 What happens if (only) the service line comes apart while you are driv... Answer143 The fifth wheel should be checked to see if:... Answer138 Which amount should a combination vehicle NOT lost air faster than?... Answer135 When you get ready to back under the semi trailer you should line up:... Answer130 Offtracking occurs when you go around a corner and:... Answer129 Why must the fifth wheel plate have enough grease?... Answer128 When you make a quick lane change, the trailer only may overturn. What... Answer125 The following two things will help prevent rollovers.... Answer119 Why must you be extra careful when bobtailing?... Answer116 Why should you never unlock the pintle hook with the dolly still under... Answer111 Looking into the back of the fifth wheel, which part of the kingpin sh... Answer111 What is the cause of more than half the truck driver deaths in crashes... Answer109 The trailer air supply control:... Answer107 After you have coupled the tractor with a trailer where should the lan... Answer95 Before backing up how should you position the tractor in relation to t... Answer95 If you start a trailer skid, you should:... Answer93 Which is true regarding the trailer air supply control?... Answer85 The dolly tow bar may fly up if you unlock the pintle hook with the co... Answer81 After you lock the kingpin into the fifth wheel how can you check the ... Answer75 A kingpin is:... Answer66 When the wheels of a trailer lock up, what will the trailer tend to do... Answer48 Combination vehicles are usually heavier, longer and require more driv... Answer47 What should you use to be safe when you park trailers that don't have ... Answer47 There are two things that a driver can do to prevent a roll over. They... Answer36 There are more things to inspect on a combination vehicle than on a si... Answer24 You should do a walk around inspection when preparing to pull Doubles ... Answer |
