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Combination Test

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EXAMEN
Brenda Martinez9284
Quiz by Brenda Martinez9284, updated more than 1 year ago
Brenda Martinez9284
Created by Brenda Martinez9284 almost 9 years ago
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Resource summary

Question 1

Question
Glad hands are used to connect the:
Answer
  • Electric lines from the truck to the trailer
  • Kingpin from the tractor to the locking jaws on the glide plate
  • Service and emergency air lines from the truck to the trailer

Question 2

Question
. The trailer air supply control (or tractor protection valve control) should automatically close when the air pressure falls to between____ psi
Answer
  • 20 and 45
  • 60 and 85
  • 100 and 125

Question 3

Question
If you cannot make a tum without entering another traffic lane, you should:
Answer
  • Turn wide before you start your turn
  • Turn wide as you complete your turn
  • Not make that turn

Question 4

Question
If the spring brakes dont release when you push the trailer air supply control, you should:
Answer
  • Check the air Iines connections
  • Cross the air Ines
  • Check the electriIcal service cable

Question 5

Question
The front trailer supports are up and the trailer is resting on the tractor. Make sure:
Answer
  • There Is enough clearance between the upper and lower fifth wheel
  • The safety latch is in the unlocked posltlon .
  • There Is enough clearance between the tractor frame and landing gear
  • There is enough clearance between the tops of the tractor tires and the nose of the trailer
  • A and B are correct,

Question 6

Question
You supply air to the trailer tanks by
Answer
  • Pushing In the trailer air upply valve
  • Pulling out the trailer air suppIy valve
  • Connecting the service line gland

Question 7

Question
A driver crosses the air lines when hooking up to an trailer with no spring brakes. What will happen?
Answer
  • The hand valve will apply the tractor brake not the trailer brakes
  • The brake pedal will work the trailer spring brakes not the air brakes
  • The driver could drive away with no trailer brakes

Question 8

Question
Which part of the kingpin should the locking' jaws close around?
Answer
  • The shank
  • the head
  • the base

Question 9

Question
When coupling, the proper position of the fifth wheel is:
Answer
  • Level with the ground
  • Tilted up towards the end of the tractor
  • Tilted down towards the end of the tractor

Question 10

Question
To unlock the fifth wheel, pull the relead handle to the position.
Answer
  • open
  • neutral
  • closed

Question 11

Question
Before you back under a truck trailer, make iure the:
Answer
  • Trailer brakes are locked
  • Air supple know is in
  • Air brakes are off

Question 12

Question
After you connect the air Iines, but before you back under the trailer, you should:
Answer
  • Make sure the traile rakes are off
  • Walk around the rig to be sure it is clear
  • Supply air to the trailer system, then pull out the air supply knob

Question 13

Question
After you lock the kingpin into the fifth wheel, you should check the connection by pulling:
Answer
  • Forward 50 feet, turning right, and left
  • The tractor ahead sharply to release the trailer brakes
  • The tractor ahead gently with the trailer brakes locked

Question 14

Question
When should you use the hand valve park a combination vehicle
Answer
  • To park at loading docks
  • To park on a grade
  • Never

Question 15

Question
The best way to tell if your trailer has started to skid to:
Answer
  • Hear the wheels skidding
  • See It In your mIrrors
  • Feel for "pulling" in the cab

Question 16

Question
You are uncoupling a trailer. After you shut off the trailer air supply and lock the trailer brakes, you should:
Answer
  • Back up gently to ease pressure on the fifth wheel locking jaws
  • Begin to lower the trailer landing gear
  • Immediately put on your tractor parking brakes

Question 17

Question
Why should you be sure that the fifth whee plate Is greased as required?
Answer
  • To ensure good electrical connections
  • To prevent steering problems
  • To reduce heat and noise

Question 18

Question
For a coupling to be complete, the safety catch for the fifth wheel locking lever must be:
Answer
  • Straight up
  • Through the locking lever
  • Over the locking lever

Question 19

Question
What will happen if the air lines are crossed when you hook up to an old trailer with no spring brakes
Answer
  • the hand vlave applles the tractor brakes instead of the trailer brakes
  • you could drive away with not trailer brakes
  • the brakes lights will not come on when you press the brake pedal

Question 20

Question
One the things a driver can do to prevent a rollover is to keep:
Answer
  • Both hands firmly on the steering wheel
  • the cargo has closed to the ground as possible
  • The fifth wheel free play as small as possible

Question 21

Question
To stop a trailer skid, you should:
Answer
  • Use the trailer hand brake
  • Release the service brakes
  • Countersteer

Question 22

Question
You have pushed in the trailer supply valve. You should not move the tractor until the whole air system is:
Answer
  • Empty
  • At normal pressure
  • Between 60 and 80 psi

Question 23

Question
When you get ready to back under under a trailer you should line up:
Answer
  • The left rear outside dual wheel with the kingpin
  • The kingpin with the edge of the drivers side locking jaw
  • Directly in front of the trailer.

Question 24

Question
A trailer is most likely to jackknife when it is
Answer
  • Loaded to full capaclty
  • over loaded
  • empty

Question 25

Question
You have a major leak in the service line and you put on the brakes. Service air pressure will escape and cause the:
Answer
  • Trailer emergency brakes to come on
  • Trailer tank pressure to be lost
  • Tractor spring brakes to lock on

Question 26

Question
The air leakage rate for a combination of two vehicles (engine off, brakes off) should not be greater than_______psi per minute.
Answer
  • 2
  • 3
  • 4

Question 27

Question
loss of air pressure in the emergency line causes:
Answer
  • the relay valves to close
  • An increase in air pressure to the service line
  • the trailer´s emergency brakes to come on

Question 28

Question
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?
Answer
  • It should not be done
  • It results in less skidding than using the brake pedal alone
  • it is the best way to brake and keep the truck in a straight line

Question 29

Question
A tractor with a(n)________trailer requires the shortest stopping distance
Answer
  • Empty
  • Lightly loaded
  • Fully Loaded

Question 30

Question
In general, the higher your truck´s center of gravity, ''the:
Answer
  • Easler it is to turn around comers
  • More stable it is when turning
  • Easier it is to turn over

Question 31

Question
Which of these statements is true?
Answer
  • The brake and suspension system of combination vehicles work best with a light load
  • Light vehicles need more braking power to stop than heavy ones.
  • "bobtail" tractors can take longer to stop than a combination vehicle

Question 32

Question
When should you use chocks to park a trairles not equipped with spring brakes?
Answer
  • Never
  • Always
  • Only when it will be parked on an incline

Question 33

Question
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:
Answer
  • Turning on the parking brakes from the cab
  • Watching your mirrors to see if the trailer lights come on
  • Applying and releasing the trailer brakes and listening for brake sounds.

Question 34

Question
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?
Answer
  • The emergency and service air lines.
  • The electrical service cable.
  • Nothing, back up and lock the fifth wheel.

Question 35

Question
You have uncoupled a trailer and you want to inspect the landing gear. the tractor should be positioned:
Answer
  • With the tractor frame under the trailer
  • Completely clear of the trailer
  • With the fifth wheel directly beneath the kingpin

Question 36

Question
When you are uncoupling a loaded trailer, lower the landing gear until it:
Answer
  • Makes firm contact with the ground
  • Makes contact with the groudn and lifts the trailer off of the fift wheel
  • Just reaches the ground

Question 37

Question
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
Answer
  • 10
  • 20
  • 30

Question 38

Question
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:
Answer
  • The kingpin is about 1 1/4 inches above the fifth wheel
  • The end of the kingpin is even with the top of the fifth wheel
  • It will be raised slightly when the tractor is backed under it.

Question 39

Question
The tractor protection valve will close and the trailer emergency brakes will come on when there is a major leak in the____brake line
Answer
  • Service
  • Parking
  • Emergency

Question 40

Question
You are driving a combination vehicle. If the service air line comes apart but the emergency line stays together, what will happen right away?
Answer
  • The trailers air tank will exhaust through the open line
  • The emergency traller brakes will come on
  • Nothing is likely to happen until you try to apply the brakes

Question 41

Question
After the trailer has been coupled to the tractor, the tractor protection control valve should be placed in the________position.
Answer
  • Down
  • Up
  • Normal

Question 42

Question
You should not back a tractor under a trailer until the whole air system is:
Answer
  • Empty
  • At normal pressure
  • Between 60 and 80 psi

Question 43

Question
When checking the trailer's emergency brakes, the tractor protection control valve should be placed in the ____ position.
Answer
  • Normal
  • Neutral
  • Emergency

Question 44

Question
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:
Answer
  • Tractot to lose all air pressure
  • Trailer supply valve to stay open
  • tractor protection valve to close

Question 45

Question
You want to inspect the trailer supports. You should place the tractor transmission in wich gear afet you have uncoupled the trailer?
Answer
  • Low reverse
  • Neutral
  • High reverse

Question 46

Question
Why should you lock the tractor glad hands (or dummy couplers) to each other when you are not towing a trailer?
Answer
  • The connected brake circuit becomes a back up air tank
  • It will keep water out of the lines
  • If you do not, you could never build system pressure

Question 47

Question
When backing under a tractor under a trailer you should expect:
Answer
  • Trailer will be lifted slightly when the tractor backs under it.
  • always approach the trailer at a slight angle
  • do it quickly to ensure that the kingpin is locked into the fifth wheel

Question 48

Question
after you have coupled the trailer, you should begin raising the landing gear by using the ___gear
Answer
  • Low
  • Mid-level
  • High

Question 49

Question
There are two things that can prevent a rollover, they are 1) keep the cargo as close to the ground as possible, and 2)
Answer
  • make sure the brakes are properly adjusted
  • Keep both hands firmly on the steering wheel
  • Go slow around turns

Question 50

Question
which of these vehicles off track the most
Answer
  • 5 axle tractor towing a 52 foot trailer
  • 5 axle tractor towing a 45 foot trailer
  • 5 axle tractor towing a 42 foot trailer

Question 51

Question
if you have coupled with a semitrailer, where should the front trailer supports be driving away
Answer
  • Raised 1/2 way with the crank handle secured in its bracket
  • Raised 3/4 way with the crank handle removed
  • Fully raised with the crank handle secured in its bracket

Question 52

Question
The fifth wheel locking lever is not locked after the jaws close around the kingpin. This means that:
Answer
  • The trailer will not swivel on the fifth wheel
  • The parking lot is off and may drive away
  • The coupling is not right and should be fixed before driving the vehicle.

Question 53

Question
compared to a straight truck or bus there are ____things to inspect on a combination vehicle
Answer
  • fewer
  • he same amount
  • more

Question 54

Question
How much space should be between the upper and lower fifth wheel after coupling?
Answer
  • about 1/4 inch
  • just enough to see light through it
  • none

Question 55

Question
Air lines on a combination vehicle are often colored to keep them from getting mixed up. The emergency line is ____; the service line is ____.
Answer
  • Red, blue
  • Blue, red
  • Black, yellow
  • Depends on the type of trailer

Question 56

Question
How should you test the tractor semi trailer connection for security?
Answer
  • Pull gently forward in low gear against the locked trailer brakes, then look at it carefully.
  • Put the tractor in gear and pull ahead with a sharp jerk.
  • Rock the trailer back and forth with the trailer brakes locked.
  • Don't worry. The connection should be fine.

Question 57

Question
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?
Answer
  • Nothing is likely to happen until you try to apply the brakes.
  • The trailer's air tank will exhaust through the open line.
  • The emergency tractor brakes will come on.

Question 58

Question
In normal driving, some drivers use the hand valve before applying the brake pedal to prevent a jackknife. Which of these statements is true?
Answer
  • It results in less skidding than using the brake pedal alone.
  • It should not be done.
  • It is the best way to brake and keep the truck in a straight line.

Question 59

Question
The safety catch for the fifth wheel locking lever must be ____ for a coupling to be complete.
Answer
  • Under the locking lever
  • Over the locking lever
  • Through the locking lever

Question 60

Question
Semi trailers made before 1975 that are equipped with air brakes:
Answer
  • Often do not have spring brakes.
  • Usually need a glad hand converter.
  • Are easier to brake because they are heavier

Question 61

Question
You are coupling a tractor and semi trailer and have connected the air lines. Before backing under the trailer, you should:
Answer
  • Make sure that the trailer brakes are off.
  • Supply air to the trailer system, then pull out the air supply knob to lock the trailer brakes.
  • Apply the brakes twice to alert others.

Question 62

Question
Which of these statements about stopping distance and speed is true?
Answer
  • You need about two times as much stopping distance at 40 mph as at 20 mph
  • Wet roads can double stopping distance at any speed
  • Att 55 mph, it will take about 10 seconds to stop your vehicle

Question 63

Question
Before loading, unloading, or driving a tanker, the first thing you should do is
Answer
  • Properly secure all of the bafles
  • Inspect the vehicle
  • Make sure the tanker is properly placarded

Question 64

Question
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.
Answer
  • Accelerate slightly
  • Coast
  • Brake lightly

Question 65

Question
Wich of these statements is true about emergency steering?
Answer
  • A move to your right may be best, if a oncoming driver drifts into your lane
  • You can always stop more quickly tan you can steer to avold a hazard
  • You can steer more quickly and safely with one hand tan with two

Question 66

Question
The hand valve should be used:
Answer
  • Only with a foot brake.
  • To test the trailer brakes
  • As a parking brake.

Question 67

Question
When driving a set of doubles it is necessary to close which shut-off valve in the last trailer
Answer
  • Front.
  • Middle section
  • Back.

Question 68

Question
You are about to back your tractor under a semitrailer. The trailer is at the right height when the:
Answer
  • Kingpin is about 1 1/4 inches above the fifth wheel.
  • End of the kingpin is even with the top of the fifth wheel
  • Trailer will be lifted slightly when the tractor backs under it.

Question 69

Question
When connecting the glad hands press the two seals with the coupler together at what decree to each other?
Answer
  • 45 degree
  • 190 degree.
  • 180 degrees.

Question 70

Question
Off-tracking or cheating causes of which of these to follow the wider pass while making a turn?
Answer
  • Tractor towing a 45-feet trailer
  • Tractor with two 27-feet trailers
  • 53-feet bobtail.

Question 71

Question
The iron trailer supports are up and the trailer is resting on the tractor. Make sure:
Answer
  • There is enough clearance between the upper and lower fifth wheels
  • The safety latch is in unlocked position.
  • There is enough clearance between the tractor frame and the landing gear

Question 72

Question
Air and electrical lines from the tractor to the trailer should be:
Answer
  • Fully tight but away a little looped.
  • Secured but with enough loop to turn.
  • Resting on the frame of the tractor
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