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📖 Combination Test
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51
Air and electrical lines from the tractor to the trailer should be:
Fully tight but away a little looped.
Secured but with enough loop to turn. ✓ CORRECT
Resting on the frame of the tractor.
52
You have a major leak in the service line and you put on the brakes. Service air will escape and cause the:
Trailer emergency brakes to come on. ✓ CORRECT
Trailer tank pressure to be lost.
Tractor spring brakes to lock up.
53
A tractor with a ____ trailers requires the shortest amount of stopping distance.
Empty.
Lightly loaded.
Fully loaded. ✓ CORRECT
54
When you get ready to back under a semitrailer you should line up:
The kingpin to engage the driver’s side locking jaw first.
Directly in front of the trailer. ✓ CORRECT
The left rear outer dual wheel with the kingpin.
55
Off-tracking of cheating causes of which of these to follow the wider pass while making a turn?
Tractor towing a 45-feet trailer. ✓ CORRECT
Tractor with two 27-foot trailers.
53-foot bobtail.
56
You should not back a tractor under a trailer until the whole air system is:
Empty.
At normal pressure ✓ CORRECT
Between 60 and 80 psi.
57
After you lock the kingpin into the fifth wheel, you should check the connection by:
Pulling forward 50 feet, turning right and then left.
Backing up with the trailer brakes released.
Pulling the tractor ahead gently with the trailer brakes locked. ✓ CORRECT
58
When should you use the hand valve to park a combination vehicle?
To park at loading docks.
To park on a grade.
Never ✓ CORRECT
59
You have coupled with a semitrailer. Where should you put the iron trailer supports before driving away?
Raised ½ way with the crank handle secured in its bracket.
Fully raised with the cranck handle secured in its bracket. ✓ CORRECT
3 turns off the top with the crank handle secured in its bracket.
60
You have coupled with a semitrailer. Where should you put the iron trailer supports before driving away?
Raised ½ way with the crank handle secured in its bracket.
Fully raised with the cranck handle secured in its bracket. ✓ CORRECT
3 turns off the top with the crank handle secured in its bracket.