CDL Combination Test Exam With 100% Correct Answers 2024

CDL Combination Test Exam With 100% Correct Answers 2024 If you cross connect the two air lines the following will result - answerYou will not have air going to the trailer brakes You have coupled with a semi-trailer. In what position should you put the front trailer supports before driving away? - answerFully raised with the crank handle secured in its bracket Th trailer air supply control: - answerIs a red, eight sided knob A device which connects the service and emergency air lines from the truck to the trailer is called.. - answerGlad hands If one of the glad hands on your blue air line is missing a seal: - answerYou might end up with a service line air leak In order to supply air to the trailer, you must first: - answerStop engine so you can hear the brakes The hand valve should be used: - answerTo test the trailer brakes The air leakage rate for a combination vehicle (engine off, brakes on) should not be more than _______ psi per minute - answer4 When should you use the hand valve to park a combination vehicle? - answerNever When you get ready to back under the semi-trailer you should line up - answerDirectly in front of the trailer If the service air line comes apart while you are driving a combination vehicle but the emergency line stays together, what will happen right away - answerNothing is likely to happen until you try to apply the brakes When uncoupling, if you park the trailer at an angle... - answerYou could do damage to the landing gear Which of these statements is true? - answer"Bobtail" tractors can take longer to stop than a combination vehicle loaded to the maximum gross weight In normal driving, some drivers use the hand valve before applying the brake pedal to prevent a jackknife. Which of these statements is true? - answerIt should not be done When you inspect the coupling, check to ensure that: - answerThere's a little slack in the air lines When backing under a tractor under a trailer you should expect: - answerTrailer will be lifted slightly when the tractor back under it A king pin is: - answerA pin which locks the trailer to the tractor on the fifth wheel The safety catch for the fifth wheel locking level must be ______ for a coupling to be complete. - answerOver the locking lever The air leakage rate for a combination vehicle (engine off, brakes off) should be no more than _____ psi per minute. - answer3 You are coupling a tractor to a semi-trailer and have backed up but are not under it. What should you hook up before backing under? - answerThe emergency and service air lines Air lines on a combination vehicle are often colored to keep them from getting mixed up. The emergency line is ____; the service line is _____. - answerRed, blue You should not back a tractor under a trailer until the whole air system is: - answerAt normal pressure Large combination vehicles take longer to stop: - answerWhen they are empty In order to inspect the coupling, you should: - answerUse a flashlight if necessary After you supply air to the trailer, make sure the air lines are not crossed and the trailer brakes are working. This is done by: - answerApplying and releasing the trailer brakes and listening for brake sounds; and also by lifting the brake pedal The front trailer supports are up and the trailer is resting on the tractor. Make sure: - answerThere is enough clearance between the tractor frame and the landing gear and that there is enough clearance between the tops of the tractor tires and the nose of the trailer You can damage the landing gear if you: - answerBack under the trailer at an angle After you supply air to the trailer, make sure the airlines are not crossed and the trailer brakes are working. This is done by: - answerApplyin