CDL Combination Vehicles Practice Test #1

Welcome future truck drivers! The following is the CDL Combination Vehicles Practice Test #1. Simply click in your answer (A,B,C, or D) to each CDL practice test question. When you're done, check your score and the results. You can reset the test and retake it as many times as you want.

CDL Combination Vehicles Practice Test #1 Start Now 1. When uncoupling, it's a good practice to... A couple the glad hands together B couple the glad hands to dummy couplers C hang the electrical cable with the plug end down D all of the above are acceptable 2. If you cross your air lines on a new trailer with spring brakes... A you won't be able to release the trailer brakes B you won't be able to release the tractor brakes C you won't have any operational brakes D you'll have no way of knowing there's a problem 3. When traveling under 40 mph, you should follow other vehicles... A Only during the day B With a distance of one second for every ten feet of your vehicle length C With a distance of one second for every twenty feet of your vehicle length D As close as possible so others don?t cut in 4. In order to supply air to the trailer, you must first... A Push in the tractor protection valve. B Pull out the "air supply' knob C Stop engine so you can hear the brakes D Cross the air lines to check for leaks 5. If one of the glad hands on your blue air line is missing a seal... A take one off the red air line and use that as a temporary replacement B you might end up with a service line air leak C you could experience an emergency line air leak D it's not a major problem and you should continue coupling 6. When you inspect the coupling, check to ensure that... A there's a little slack in the air lines B there's no slack in the air lines C the landing gear handle is hanging free D the electrical cable is unplugged 7. The trailer hand valve should be used... A Only at highway speeds B Only when parking C Only to test the trailer brakes D Both B & C above 8. Which one of the following statements about tractor protection valves is NOT true? A It keeps air in the tractor in the event the trailer air leaks B It is controlled by the trailer air supply valve in the cab C When it closes it allows air to leak from the tractor line D It will close automatically if air pressure is low 9. You can damage the landing gear if you... A back under the trailer at an angle B align the tractor and trailer C position the trailer kingpin in the center of the fifth wheel D back under the trailer in a straight line 10. Which one of the following is controlled by the foot brake? A The service air line B The emergency air line C The shut off valve D The hose coupler 11. When uncoupling, if you park the trailer at an angle... A you won't have to do as much walking around the vehicle B you'll have more room to maneuver in the yard C you'll make the process easier D you could do damage to the landing gear 12. If you start a trailer skid you should... A Step on the brakes quickly B Release the brakes to get traction back C Use the trailer hand brake D Slowly apply pressure to the brakes 13. When coupling the glad hands, you should NOT do the following... A Clean the couplers before a connection is made B Press the two seals together at a 90 degree angle C Cross air supply lines to test them for leaks D Match the colors to each other, or read the tags before connecting 14. If you cross connect the two air lines the following will result... A Nothing, the lines are interchangeable B You will not have air going to the trailer brakes C Your tractor brakes will lock up D You could not move the tractor 15. When rolling up the landing gear to complete the coupling process... A leave the landing gear half way down to make uncoupling easier later B use low gear until the tractor is supporting the trailer C use high gear to speed up the process D grease the landing gear to speed up the process Test Score = Correct Answers: Get My CDL! The New Trucker Career Center CDL Practice Tests Access Page Trucker Country Home Page Click Here to Take the Next Test! Or choose from these additional CDL Practice Tests! 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