COMBINATION HOME WORK

*. Glad hands are used to connect the?

a. Electric lines from the tractor to the trailer

b. King pin from the tractor to the locking jaws in the glide plate c. Service and emergency air lines from the tractor to the trailer 2. Why should you be sure the fifth wheel plate is greased as required? a. To ensure good electrical connections

b. To prevent steering problems

c. To reduce heat and noise

3. After connecting the air lines, but before backing under the trailer, you should?

a. Supply air to the trailer system, then pull out the supply knob b. Make sure the trailer brakes are off

c. Walk around the rig to make sure it is clear

4. A tractor trailer vehicle combination is most likely to roll over in a turn when the configuration includes?

a. A 45 foot and 28 foot trailer

b. Double 45 foot trailers

c. Triple 28 foot trailers

5. The trailer air supply control vlve should automatically close when the air pressure falls to between PSI?

a. 100 and 125

b. 60 and 85

c. 20 and 45

6. When coupling the proper position of the fifth wheel is? a. Level with the ground

b. Tilted up towards the end of the tractor

c. Tilted down towards the end of the tractor

7. Which part of the king pin should the locking jaws close around? a. The shank

b. The head

c. The base

8. When checking that the trailer is securely coupled to the tractor the landing gear should be?

a. Fully raised

b. Slightly raised

c. Fully lowered

9. A trailer is most likely to jack knife when it is? a. Loaded to full capacity

b. Over loaded

c. Empty

10. The spring doesn’t release when you push the trailer air supply control valve, you should?

a. Check the air line connections

b. Cross the lines

c. Check the electrical service cable

11. Loss of air pressure in the emergency lines causes? a. The relay valves to close

b. A increase in air pressure to the service line

c. The trailer emergency brakes to come on

12. When you get ready to back under a semi-trailer you should line up? a. The king pin to engage the drivers side locking jaws first b. Directly in front of the trailer

c. The left rear dual wheel with the king pin

13. The best way to tell if your trailer has started to skid is to? a. Hear the tires skidding

b. See it in your mirrors

c. Feel the pulling in the cab

14. Why should you lock the tractor glad hands to each other are to the dummy couplers when you are not towing a trailer?

a. The connected brake circuit becomes a backup air tank b. It will keep dirt and water out of the air lines c. If you don’t you could never build up air pressure 15. To unlock the fifth wheel, pull the release handle to the position? a. Open

b. Neutral

c. Closed

16. When should you use the hand valve to park a combination vehicle? a. To park at a loading dock

b. To park on a grade

c. Never

17. A Driver crosses the air lines when hooking up to a old trailer, what will happen?

a. The hand valve will apply the tractor brakes, instead of the trailer brakes b. If the trailer has no spring brakes, you could drive away but would have no trailer brakes

c. The brake pedal will work the trailer spring brakes instead of the air brakes

18. You supply air to the trailer tanks by?

a. Pushing in the trailer air supply valve

b. Pulling out the trailer air supply valve

c. Connecting to the service line glad hand

19. The front trailer supports are up and the trailer is resting on the tractor, make sure

a. There is enough clearance between the upper and lower fifth wheel plates

b. The safety latch is in the unlocked position

c. There is enough clearance between the tractor frame and the landing gear

20. The safety latch for the fifth wheel locking lever must be for a coupling to be correct

a. Over the locking lever

b. Straight up

c. Through the locking lever

21. You are hooking a tractor to a semi-trailer and have backed up but are not under it. What should you do before backing under the trailer a. Hook up the electrical service cable

b. Hook up the emergency and service air lines

c. Nothing, back under the trailer and secure the fifth wheel 22. After pushing in the trailer supply valve, you should not move the tractor until air system is?

a. Charging

b. At normal pressure

c. Between 50 and 60 PSI

23. There are two things that a driver can do to prevent a rollover, they are one keep the cargo as close to the ground as possible and? a. Make sure the brakes are properly adjusted

b. Keep both hands on the steering wheel

c. Reduce your speed before entering curves or turns 24. With the engine off, and the brakes released and your foot on the brake pedal, a combination vehicle air brake system should not leak more than how many PSI in one minute?

a. 1 PSI

b. 2 PSI

c. 4 PSI

25. If the fifth wheel locking lever is not locked after the jaws close around the kingpin

a. The trailer will not swing on the fifth wheel

b. The hand valve is released and you may drive away c. The coupling is not correct and should be corrected before driving the coupled unit

26. After coupling a semi-trailer you should crank the front trailer supports how high?

a. Raised way with the crank handle secured

b. Raised way with the crank handle secured

c. Fully raised with the handle in its bracket (cradle) 27. Air brake equipped trailers made before 1975

a. Usually do not have spring brakes

b. Usually need a glad hand converter

c. Cannot be operated on interstate highways

28. During normal driving some drivers use the trolly (Hand valve) before the brake in order to prevent trailer skids, which of the following statements is true?

a. It results in less skidding than using the brake pedal alone b. It is the best way to brake in a straight line

c. It should never be done

29. You are hooking up to a tractor and semi-trailer and have connected both air lines, before backing under the trailer what should you do? a. Pull forward to test glad hand connections

b. Supply air to the trailer system then pull out the supply knob to lock the trailer brakes

c. Blow the air horn twice to alert others

30. If the service line disconnects while you are driving what will happen right away?

a. The emergency tractor brakes will come on

b. The emergency trailer brakes will come on

c. Nothing is likely to happen until you try to use your brakes 31. After hooking up you should check the fifth wheel connection by a. Driving away at 20 MPH and pulling down the trailer hand valve. b. Backing up with the trailer brakes released

c. Pulling the tractor ahead gently with the trailer brakes locked 32. When hooking a tractor to a trailer you will know the trailer is at the correct height when the?

a. The kingpin is about 2 inches above the fifth wheel b. The beginning of the kingpin is even with the top of the lower fifth wheel plate

c. The coupling device of the trailer is just below the middle of the tractor fifth wheel

33. You are driving a combination vehicle when the tractor breaks away and pulls apart the air lines you would expect the trailer brakes to apply and? a. The tractor to loose all pressure

b. The tractor brakes to keep working properly

c. The tractor brakes to lock up

34. How much space should be between the upper and lower fifth wheel plates? a. About 1 inch

b. No more than 1/2 an inch

c. None

35. At what angle do you connect your glad hand connections to the trailer? a. 45 degrees

b. 60 degrees

c. 90 degrees

36. The hand valve should be used

a. As a parking brake

b. Only with the foot brake

c. To test the trailer brakes

37. What is off tracking?

a. Driver failing to keep the truck on route or track b. The process of taking the tracks of a tractor

38. What is the purpose of the service air lines?

a. To service the air control supply

b. To service the tractor air brakes

c. To carry air to the trailer service brakes

39. In coupling when is the trailer height correct? a. When the trailer landing gear is fully extended b. When the trailer will be lifted slightly when the tractor connects 40. Which of these statements about backing a vehicle is true? a. The helper should be out of the drivers sight and use spoken signals to help the drive

b. It is safest to back toward the right of the vehicle than toward the drivers side

c. You should avoid backing whenever possible

41. According to accident reports the vehicle trucks and buses most often collide with is?

a. The one behind them

b. The one to the right of them

c. The one in front of them

42. Which of these is a good thing to do when steering to avoid a crash? a. Apply the brakes while turning

b. Steer with one hand on the wheel and one hand on the air horn c. Don’t turn any more than needed to clear what is in your way 43. For your safety when setting out reflective triangles you should a. Carry the triangles at your side

b. Hold the triangles between yourself and oncoming traffic c. Keep them out of sight while you walk to the spot where you set them out 44. You are dropping a trailer and the release arm won’t release properly because the locking jaws have too much pressure on them, what should you do?

a. Pull forward gently and set your tractor parking brakes b. Raise the trailer slightly to remove pressure

c. Gently back up the tractor and set your tractor brakes 45. If you are dropping a fully loaded trailer, how do you lower the landing gear? a. Dolly the legs down until they make full contact with the ground b. Crank the landing gear until the sand bags are about from the ground c. After landing gear makes firm contact with the ground turn crank in low gear a few extra turns

46. After unhooking a tractor from trailer pull tractor forward how far? a. Pull tractor completely clear of trailer

b. Pull tractor forward but leave tractor frame under trailer c. Pull tractor forward until back tires are even with the front of trailer 47. After tractor is pulled to proper distance in front of trailer how do you secure the tractor?

a. As long as the tractor remains in low gear you don’t have to apply the brakes

b. Leave the tractor in gear and apply the spring brakes c. Engage the parking brakes with the transmission in neutral 48. When inspecting the trailer supports, you should check for a. Trailer height

b. Ground support and damage

c. Gravel on dolly pads

49. If your trailer doesn’t have spring brakes how should you secure it? a. Park on level ground

b. Leave the tractor hooked to it

c. Use chock blocks

50. What color are the trailer service and emergency air lines? a. Blue and green

b. Red and black

c. Blue and red

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