3088827
Descripción
Test por Brenda Martinez9284, actualizado hace más de 1 año
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Creado por Brenda Martinez9284
hace casi 9 años
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Pregunta 1
Pregunta
Glad hands are used to connect the:
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Electric lines from the truck to the trailer
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Kingpin from the tractor to the locking jaws on the glide plate
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Service and emergency air lines from the truck to the trailer
Pregunta 2
Pregunta
. The trailer air supply control (or tractor protection valve control) should automatically close when the air pressure falls to between____ psi
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20 and 45
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60 and 85
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100 and 125
Pregunta 3
Pregunta
If you cannot make a tum without entering another traffic lane, you should:
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Turn wide before you start your turn
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Turn wide as you complete your turn
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Not make that turn
Pregunta 4
Pregunta
If the spring brakes dont release when you push the trailer air supply control, you should:
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Check the air Iines connections
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Cross the air Ines
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Check the electriIcal service cable
Pregunta 5
Pregunta
The front trailer supports are up and the trailer is resting on the tractor. Make sure:
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There Is enough clearance between the upper and lower fifth wheel
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The safety latch is in the unlocked posltlon .
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There Is enough clearance between the tractor frame and landing gear
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There is enough clearance between the tops of the tractor tires and the nose of the trailer
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A and B are correct,
Pregunta 6
Pregunta
You supply air to the trailer tanks by
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Pushing In the trailer air upply valve
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Pulling out the trailer air suppIy valve
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Connecting the service line gland
Pregunta 7
Pregunta
A driver crosses the air lines when hooking up to an trailer with no spring brakes. What will happen?
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The hand valve will apply the tractor brake not the trailer brakes
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The brake pedal will work the trailer spring brakes not the air brakes
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The driver could drive away with no trailer brakes
Pregunta 8
Pregunta
Which part of the kingpin should the locking' jaws close around?
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The shank
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the head
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the base
Pregunta 9
Pregunta
When coupling, the proper position of the fifth wheel is:
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Level with the ground
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Tilted up towards the end of the tractor
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Tilted down towards the end of the tractor
Pregunta 10
Pregunta
To unlock the fifth wheel, pull the relead handle to the position.
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open
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neutral
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closed
Pregunta 11
Pregunta
Before you back under a truck trailer, make iure the:
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Trailer brakes are locked
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Air supple know is in
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Air brakes are off
Pregunta 12
Pregunta
After you connect the air Iines, but before you back under the trailer, you should:
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Make sure the traile rakes are off
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Walk around the rig to be sure it is clear
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Supply air to the trailer system, then pull out the air supply knob
Pregunta 13
Pregunta
After you lock the kingpin into the fifth wheel, you should check the connection by pulling:
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Forward 50 feet, turning right, and left
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The tractor ahead sharply to release the trailer brakes
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The tractor ahead gently with the trailer brakes locked
Pregunta 14
Pregunta
When should you use the hand valve park a combination vehicle
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To park at loading docks
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To park on a grade
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Never
Pregunta 15
Pregunta
The best way to tell if your trailer has started to skid to:
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Hear the wheels skidding
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See It In your mIrrors
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Feel for "pulling" in the cab
Pregunta 16
Pregunta
You are uncoupling a trailer. After you shut off the trailer air supply and lock the trailer brakes, you should:
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Back up gently to ease pressure on the fifth wheel locking jaws
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Begin to lower the trailer landing gear
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Immediately put on your tractor parking brakes
Pregunta 17
Pregunta
Why should you be sure that the fifth whee plate Is greased as required?
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To ensure good electrical connections
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To prevent steering problems
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To reduce heat and noise
Pregunta 18
Pregunta
For a coupling to be complete, the safety catch for the fifth wheel locking lever must be:
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Straight up
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Through the locking lever
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Over the locking lever
Pregunta 19
Pregunta
What will happen if the air lines are crossed when you hook up to an old trailer with no spring brakes
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the hand vlave applles the tractor brakes instead of the trailer brakes
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you could drive away with not trailer brakes
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the brakes lights will not come on when you press the brake pedal
Pregunta 20
Pregunta
One the things a driver can do to prevent a rollover is to keep:
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Both hands firmly on the steering wheel
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the cargo has closed to the ground as possible
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The fifth wheel free play as small as possible
Pregunta 21
Pregunta
To stop a trailer skid, you should:
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Use the trailer hand brake
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Release the service brakes
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Countersteer
Pregunta 22
Pregunta
You have pushed in the trailer supply valve. You should not move the tractor until the whole air system is:
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Empty
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At normal pressure
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Between 60 and 80 psi
Pregunta 23
Pregunta
When you get ready to back under under a trailer you should line up:
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The left rear outside dual wheel with the kingpin
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The kingpin with the edge of the drivers side locking jaw
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Directly in front of the trailer.
Pregunta 24
Pregunta
A trailer is most likely to jackknife when it is
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Loaded to full capaclty
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over loaded
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empty
Pregunta 25
Pregunta
You have a major leak in the service line and you put on the brakes. Service air pressure will escape and cause the:
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Trailer emergency brakes to come on
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Trailer tank pressure to be lost
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Tractor spring brakes to lock on
Pregunta 26
Pregunta
The air leakage rate for a combination of two vehicles (engine off, brakes off) should not be greater than_______psi per minute.
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2
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3
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4
Pregunta 27
Pregunta
loss of air pressure in the emergency line causes:
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the relay valves to close
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An increase in air pressure to the service line
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the trailer´s emergency brakes to come on
Pregunta 28
Pregunta
To prevent a jackknife in normal driving, some drivers use the hand valve before stepping on the brake pedal. Which of these statements is true?
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It should not be done
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It results in less skidding than using the brake pedal alone
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it is the best way to brake and keep the truck in a straight line
Pregunta 29
Pregunta
A tractor with a(n)________trailer requires the shortest stopping distance
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Empty
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Lightly loaded
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Fully Loaded
Pregunta 30
Pregunta
In general, the higher your truck´s center of gravity, ''the:
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Easler it is to turn around comers
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More stable it is when turning
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Easier it is to turn over
Pregunta 31
Pregunta
Which of these statements is true?
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The brake and suspension system of combination vehicles work best with a light load
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Light vehicles need more braking power to stop than heavy ones.
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"bobtail" tractors can take longer to stop than a combination vehicle
Pregunta 32
Pregunta
When should you use chocks to park a trairles not equipped with spring brakes?
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Never
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Always
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Only when it will be parked on an incline
Pregunta 33
Pregunta
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:
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Turning on the parking brakes from the cab
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Watching your mirrors to see if the trailer lights come on
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Applying and releasing the trailer brakes and listening for brake sounds.
Pregunta 34
Pregunta
You are coupling a tractor to a semi trailer. You have backed up but are not under it. What should you hook up before backing under the semitrailer?
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The emergency and service air lines.
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The electrical service cable.
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Nothing, back up and lock the fifth wheel.
Pregunta 35
Pregunta
You have uncoupled a trailer and you want to inspect the landing gear. the tractor should be positioned:
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With the tractor frame under the trailer
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Completely clear of the trailer
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With the fifth wheel directly beneath the kingpin
Pregunta 36
Pregunta
When you are uncoupling a loaded trailer, lower the landing gear until it:
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Makes firm contact with the ground
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Makes contact with the groudn and lifts the trailer off of the fift wheel
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Just reaches the ground
Pregunta 37
Pregunta
Under good driving conditions, you should leave at least one second of space between your vehicle and the vehicle ahead for avery_____feet of your vehicles length
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10
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20
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30
Pregunta 38
Pregunta
You are coupling a tractor to a semi trailer to your tractor but have not yet backed under it. The trailer is at the right height when:
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The kingpin is about 1 1/4 inches above the fifth wheel
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The end of the kingpin is even with the top of the fifth wheel
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It will be raised slightly when the tractor is backed under it.
Pregunta 39
Pregunta
The tractor protection valve will close and the trailer emergency brakes will come on when there is a major leak in the____brake line
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Service
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Parking
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Emergency
Pregunta 40
Pregunta
You are driving a combination vehicle. If the service air line comes apart but the emergency line stays together, what will happen right away?
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The trailers air tank will exhaust through the open line
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The emergency traller brakes will come on
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Nothing is likely to happen until you try to apply the brakes
Pregunta 41
Pregunta
After the trailer has been coupled to the tractor, the tractor protection control valve should be placed in the________position.
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Down
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Up
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Normal
Pregunta 42
Pregunta
You should not back a tractor under a trailer until the whole air system is:
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Empty
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At normal pressure
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Between 60 and 80 psi
Pregunta 43
Pregunta
When checking the trailer's emergency brakes, the tractor protection control valve should be placed in the ____ position.
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Normal
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Neutral
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Emergency
Pregunta 44
Pregunta
You are driving a combination vehicle. The trailer breaks away and pulls apart both air lines. You would expect the trailer brakes to come on and the:
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Tractot to lose all air pressure
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Trailer supply valve to stay open
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tractor protection valve to close
Pregunta 45
Pregunta
You want to inspect the trailer supports. You should place the tractor transmission in wich gear afet you have uncoupled the trailer?
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Low reverse
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Neutral
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High reverse
Pregunta 46
Pregunta
Why should you lock the tractor glad hands (or dummy couplers) to each other when you are not towing a trailer?
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The connected brake circuit becomes a back up air tank
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It will keep water out of the lines
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If you do not, you could never build system pressure
Pregunta 47
Pregunta
When backing under a tractor under a trailer you should expect:
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Trailer will be lifted slightly when the tractor backs under it.
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always approach the trailer at a slight angle
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do it quickly to ensure that the kingpin is locked into the fifth wheel
Pregunta 48
Pregunta
after you have coupled the trailer, you should begin raising the landing gear by using the ___gear
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Low
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Mid-level
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High
Pregunta 49
Pregunta
There are two things that can prevent a rollover, they are 1) keep the cargo as close to the ground as possible, and 2)
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make sure the brakes are properly adjusted
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Keep both hands firmly on the steering wheel
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Go slow around turns
Pregunta 50
Pregunta
which of these vehicles off track the most
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5 axle tractor towing a 52 foot trailer
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5 axle tractor towing a 45 foot trailer
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5 axle tractor towing a 42 foot trailer
Pregunta 51
Pregunta
if you have coupled with a semitrailer, where should the front trailer supports be driving away
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Raised 1/2 way with the crank handle secured in its bracket
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Raised 3/4 way with the crank handle removed
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Fully raised with the crank handle secured in its bracket
Pregunta 52
Pregunta
The fifth wheel locking lever is not locked after the jaws close around the kingpin. This means that:
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The trailer will not swivel on the fifth wheel
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The parking lot is off and may drive away
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The coupling is not right and should be fixed before driving the vehicle.
Pregunta 53
Pregunta
compared to a straight truck or bus there are ____things to inspect on a combination vehicle
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fewer
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he same amount
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more
Pregunta 54
Pregunta
How much space should be between the upper and lower fifth wheel after coupling?
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about 1/4 inch
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just enough to see light through it
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none
Pregunta 55
Pregunta
Air lines on a combination vehicle are often colored to keep them from getting mixed up. The emergency line is ____; the service line is ____.
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Red, blue
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Blue, red
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Black, yellow
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Depends on the type of trailer
Pregunta 56
Pregunta
How should you test the tractor semi trailer connection for security?
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Pull gently forward in low gear against the locked trailer brakes, then look at it carefully.
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Put the tractor in gear and pull ahead with a sharp jerk.
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Rock the trailer back and forth with the trailer brakes locked.
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Don't worry. The connection should be fine.
Pregunta 57
Pregunta
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?
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Nothing is likely to happen until you try to apply the brakes.
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The trailer's air tank will exhaust through the open line.
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The emergency tractor brakes will come on.
Pregunta 58
Pregunta
In normal driving, some drivers use the hand valve before applying the brake pedal to prevent a jackknife. Which of these statements is true?
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It results in less skidding than using the brake pedal alone.
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It should not be done.
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It is the best way to brake and keep the truck in a straight line.
Pregunta 59
Pregunta
The safety catch for the fifth wheel locking lever must be ____ for a coupling to be complete.
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Under the locking lever
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Over the locking lever
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Through the locking lever
Pregunta 60
Pregunta
Semi trailers made before 1975 that are equipped with air brakes:
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Often do not have spring brakes.
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Usually need a glad hand converter.
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Are easier to brake because they are heavier
Pregunta 61
Pregunta
You are coupling a tractor and semi trailer and have connected the air lines. Before backing under the trailer, you should:
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Make sure that the trailer brakes are off.
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Supply air to the trailer system, then pull out the air supply knob to lock the trailer brakes.
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Apply the brakes twice to alert others.
Pregunta 62
Pregunta
Which of these statements about stopping distance and speed is true?
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You need about two times as much stopping distance at 40 mph as at 20 mph
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Wet roads can double stopping distance at any speed
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Att 55 mph, it will take about 10 seconds to stop your vehicle
Pregunta 63
Pregunta
Before loading, unloading, or driving a tanker, the first thing you should do is
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Properly secure all of the bafles
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Inspect the vehicle
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Make sure the tanker is properly placarded
Pregunta 64
Pregunta
The best way to drive through a curve is to slow to a safe speed before entering the curve and then______ as you go through it.
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Accelerate slightly
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Coast
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Brake lightly
Pregunta 65
Pregunta
Wich of these statements is true about emergency steering?
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A move to your right may be best, if a oncoming driver drifts into your lane
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You can always stop more quickly tan you can steer to avold a hazard
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You can steer more quickly and safely with one hand tan with two
Pregunta 66
Pregunta
The hand valve should be used:
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Only with a foot brake.
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To test the trailer brakes
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As a parking brake.
Pregunta 67
Pregunta
When driving a set of doubles it is necessary to close which shut-off valve in the last trailer
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Front.
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Middle section
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Back.
Pregunta 68
Pregunta
You are about to back your tractor under a semitrailer. The trailer is at the right height when the:
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Kingpin is about 1 1/4 inches above the fifth wheel.
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End of the kingpin is even with the top of the fifth wheel
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Trailer will be lifted slightly when the tractor backs under it.
Pregunta 69
Pregunta
When connecting the glad hands press the two seals with the coupler together at what decree to each other?
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45 degree
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190 degree.
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180 degrees.
Pregunta 70
Pregunta
Off-tracking or cheating causes of which of these to follow the wider pass while making a turn?
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Tractor towing a 45-feet trailer
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Tractor with two 27-feet trailers
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53-feet bobtail.
Pregunta 71
Pregunta
The iron trailer supports are up and the trailer is resting on the tractor. Make sure:
Respuesta
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There is enough clearance between the upper and lower fifth wheels
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The safety latch is in unlocked position.
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There is enough clearance between the tractor frame and the landing gear
Pregunta 72
Pregunta
Air and electrical lines from the tractor to the trailer should be:
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Fully tight but away a little looped.
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Secured but with enough loop to turn.
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Resting on the frame of the tractor
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