combination

Question 1

where should the tractor be when you inspect landing gear after uncoupling the trailer?

Answer 1

with the tractor frame under the vehicle

Question 2

while driving behind another vehicle under good condition you should at least allow one second between your vehicle and the vehicle ahead for each______(how many) feet of your vehicle length

Answer 2

10

Question 3

what are 2 things the driver can do to prevent a rollover?

Answer 3

keep the cargo as close to the ground as possible and go slow around turns

Question 4

what should the leakage rate for a combination vehicle(engine off, brake off) be?

Answer 4

3 psi per minute

Question 5

the safest way to make turn without entering another traffic lane is

Answer 5

turn wide as you complete the turn

Question 6

if the service line comes apart while you are driving a combination vehicle but the emergency line stays together what will happen right away?

Answer 6

nothing is likely to happen until you hit the brakes

Question 7

glad hands are usually connecting which of these?

Answer 7

service and emergency air lines from the vehicle to the trailer

Question 8

what happens if you cross the air lines on an old trailer?

Answer 8

if the trailer has no spring brakes you could drive away but you wouldnt have trailer brakes

Question 9

when should the hand valve be used?

Answer 9

to test the trailer brakes

Question 10

when doing a set of doubles it is necessary to close which shut off valve in the last trailer?

Answer 10

back

Question 11

if the service line comes apart while you are driving a combination vehicle but the emergency line stays together what will happen right away?

Answer 11

nothing is likely to happen until you press on the brakes

Question 12

when backing the tractor under the trailer when do you know that the trailer is at the right height?

Answer 12

trailer will be lifter slightly when the tractor backs under it

Question 13

what happens if your emergency brake lines come apart or get pulled away ?

Answer 13

emergency trailer brakes come on

Question 14

if the brakes are not released when you pushed the trailer air supply valve you should…….

Answer 14

check air line connections

Question 15

air brake equipped trailers made before 1975

Answer 15

often do not have spring brakes

Question 16

after connecting the air lines but before backing up under the trailer you should..

Answer 16

supply air to the trailer system then pull out air supply knob

Question 17

which part of the kingpin should the locking jaws close around?

Answer 17

the shank

Question 18

how much space should be allowed between upper and lower fifth wheel after coupling?

Answer 18

nothing

Question 19

you have pushed the trailer air supply valve. you should not back a tractor under a trailer until the whole air system is……

Answer 19

at normal pressure

Question 20

you are coupling a tractor to a trailer and have backed up but are not under it. what should you hook up before backing under?

Answer 20

the emergency and service air lines

Question 21

what type of tractor requires the shortest amount of stopping distance?

Answer 21

fully loaded?

Question 22

what gear do you use to raise the landing gear?

Answer 22

the low one

Question 23

how do you supply air to the trailer tanks?

Answer 23

pushing in the trailer air supply valve

Question 24

why should you be sure that the fifth wheel plate is greased as required?

Answer 24

to prevent steering problems

Question 25

what happens if your emergency air line fails?

Answer 25

emergency trailer brakes will come on

Question 26

when connecting the glad hands press the two seals with the coupler together at what degree to each other?

Answer 26

90 degree

Question 27

why should you lock the tractor glad hands to each other when you are not towing a trailer?

Answer 27

it will keep dirt and water out of the line

Question 28

what gear should you use when backing under a trailer?

Answer 28

the lowest reverse gear

Question 29

after the trailer has been coupled to the tractor, the tractor protection control valve should be placed in what position?

Answer 29

normal

Question 30

what does it mean if the fifth wheel locking lever is not locked after the jaws close around the king pin?

Answer 30

the coupling is not right and should be fixed before driving the coupled unit

Question 31

what should make sure is done on a iron trailer when the supports are up and the trailer is resting on the tractor?

Answer 31

there is enough clearance between the tractor frame and the landing gear

Question 32

when you are uncoupling a loaded trailer you should lower the landing gear until it.....

Answer 32

makes firm contact with the ground, then crackle hits a low gear few extra turns

Question 33

what should you do to stop a trailer skid?

Answer 33

release the service brakes

Question 34

what should you do if you cannot make a turn without entering another traffic lane?

Answer 34

turn wide as you complete the turn

Question 35

what color is the emergency line?

Answer 35

red

Question 36

what color is the service line?

Answer 36

blue

Question 37

air leakage for combination psi per minute(engine off brakes on)

Answer 37

4psi per minute

Question 38

what position should the tractor protection valve be placed at while checking the trailer emergency brakes?

Answer 38

emergency

Question 39

while checking the trailer is securely coupled to the trailer the landing gear should be.......

Answer 39

slightly raised

Question 40

air and electrical lines from the tractor to the trailer should be.....

Answer 40

secured but with enough loop to turn

Question 41

how should you check the connections after you lock the kingpin into the fifth wheel

Answer 41

pulling the tractor ahead gently with the trailer brakes locked

Question 42

when should you use the hand valve to park a combination vehicle?

Answer 42

never

Question 43

where should the safety catch for the fifth wheel locking lever be at?

Answer 43

over the locking lever