CA CDL Combination Vehicles Complete
Exam Study Questions with Accurate
Answers | Brand New Version
1. Where should the tractor be when you inspect landing gear after uncoupling
the trailer? - ANSWER With the tractor frame under the trailer
2. While driving behind other vehicle under good condition you should allow
at least one second between your vehicle and the vehicle ahead for each
_____ ( how many) feet of your vehicle length? - ANSWER 10
3. There are two things that a driver can do to prevent a rollover. They are (1)
keep the cargo as close to the ground as possible and (2) ? - ANSWER Go
slow around turns
4. You are coupling a tractor to a semitrailer and have backed up but are not
under it. What should you hook up before backing under? - ANSWER The
emergency and service air lines
5. Tractor with _____ trailer requires the shortest amount of stopping distance.
- ANSWER Fully loaded
6. After you have coupled the trailer you have to raise the landing gear by
using? - ANSWER Low gear
7. You supply air to the trailer tanks by? - ANSWER Pushing in the trailer air
supply valve
,8. Why should you be sure that the fifth wheel plate is greased as required? -
ANSWER To prevent steering problems
9. When connecting the glad hands press the two seals with the coupler
together at what degree to each other? - ANSWER 90 degree
10.Which of these statements is true? - ANSWER Bobtail tractors can take
longer to stop than a combination vehicle loaded to maximum weight
11.Why should you lock the tractor glad hands to each other ( or dummy
couplers ) when you are not towing a trailer? - ANSWER It will keep dirt or
water out of the like
12.When backing a tractor under a trailer you should? - ANSWER Always use
the lowest reverse gear
13.After the trailer has been to the tractor, the tractor protecting control valve
should be placed in what position? - ANSWER Normal
14.The fifth wheel locking lever is not locked after the jaws close around the
kingpin. This means that? - ANSWER The coupling is not right and should
be fixed before diving and coupled unit
15.Off-tracking or cheating causes of which of these to follow the wider pass
while making a turn? - ANSWER Tractor towing a 45-foot trailer
16.The iron trailer supports are up and the trailer is resting on the tractor. Make
sure? - ANSWER There is enough clearance between the tractor frame and
the landing gear
, 17.When you are uncoupling a unloaded trailer you should lower the landing
gear until it? - ANSWER Make firm contact with the ground, then crackle
hits a low gear a few extra turns
18.To stop a trailer skid you should? - ANSWER Release the service brakes
19.The air lines o a combination vehicles are often colored to prevent them
from mixing up. The emergency line is ______ , the service line is _____ . -
ANSWER Red, blue
20.Compared to a straight truck or bus there are ____ things to inspect in
combination vehicle. - ANSWER More
21.The air brake leakage rate for a combination vehicle (engine off, brakes off)
should be less than ____ psi per minute? - ANSWER 4
22.The safest way to make turn without entering another traffic lane is? -
ANSWER You should turn wide as you complete the turn
23.The higher the center of gravity of your truck the? - ANSWER Easier to
turn over
24.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 Nothing is likely to happen until you try to apply the brakes
25.Glad hands are usually connecting which of these? - ANSWER Service and
emergency air line from the vehicle to the trailer
Exam Study Questions with Accurate
Answers | Brand New Version
1. Where should the tractor be when you inspect landing gear after uncoupling
the trailer? - ANSWER With the tractor frame under the trailer
2. While driving behind other vehicle under good condition you should allow
at least one second between your vehicle and the vehicle ahead for each
_____ ( how many) feet of your vehicle length? - ANSWER 10
3. There are two things that a driver can do to prevent a rollover. They are (1)
keep the cargo as close to the ground as possible and (2) ? - ANSWER Go
slow around turns
4. You are coupling a tractor to a semitrailer and have backed up but are not
under it. What should you hook up before backing under? - ANSWER The
emergency and service air lines
5. Tractor with _____ trailer requires the shortest amount of stopping distance.
- ANSWER Fully loaded
6. After you have coupled the trailer you have to raise the landing gear by
using? - ANSWER Low gear
7. You supply air to the trailer tanks by? - ANSWER Pushing in the trailer air
supply valve
,8. Why should you be sure that the fifth wheel plate is greased as required? -
ANSWER To prevent steering problems
9. When connecting the glad hands press the two seals with the coupler
together at what degree to each other? - ANSWER 90 degree
10.Which of these statements is true? - ANSWER Bobtail tractors can take
longer to stop than a combination vehicle loaded to maximum weight
11.Why should you lock the tractor glad hands to each other ( or dummy
couplers ) when you are not towing a trailer? - ANSWER It will keep dirt or
water out of the like
12.When backing a tractor under a trailer you should? - ANSWER Always use
the lowest reverse gear
13.After the trailer has been to the tractor, the tractor protecting control valve
should be placed in what position? - ANSWER Normal
14.The fifth wheel locking lever is not locked after the jaws close around the
kingpin. This means that? - ANSWER The coupling is not right and should
be fixed before diving and coupled unit
15.Off-tracking or cheating causes of which of these to follow the wider pass
while making a turn? - ANSWER Tractor towing a 45-foot trailer
16.The iron trailer supports are up and the trailer is resting on the tractor. Make
sure? - ANSWER There is enough clearance between the tractor frame and
the landing gear
, 17.When you are uncoupling a unloaded trailer you should lower the landing
gear until it? - ANSWER Make firm contact with the ground, then crackle
hits a low gear a few extra turns
18.To stop a trailer skid you should? - ANSWER Release the service brakes
19.The air lines o a combination vehicles are often colored to prevent them
from mixing up. The emergency line is ______ , the service line is _____ . -
ANSWER Red, blue
20.Compared to a straight truck or bus there are ____ things to inspect in
combination vehicle. - ANSWER More
21.The air brake leakage rate for a combination vehicle (engine off, brakes off)
should be less than ____ psi per minute? - ANSWER 4
22.The safest way to make turn without entering another traffic lane is? -
ANSWER You should turn wide as you complete the turn
23.The higher the center of gravity of your truck the? - ANSWER Easier to
turn over
24.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 Nothing is likely to happen until you try to apply the brakes
25.Glad hands are usually connecting which of these? - ANSWER Service and
emergency air line from the vehicle to the trailer
