Combination Vehicles Free

How do you provide air to the truck tanks by?

Pressing in the truck air supply valve.
Getting off the truck air supply valve.
Hooking up the service line gland hand
All of the above

Does the truck protection valve maintain air in the truck or truck brake system since?

The truck/truck air hose is cut off.
The truck moves away from the truck.
The air system develops a bad leak.
The truck protection valve.

When coupling with a semi-truck, back off the truck?

At an angle to the truck.
Directly in front of the truck.
In front of the right wheel.
To test the spring brakes

When coupling, the fifth wheel jaws should close around the _____ of the kingpin.

Head
Botton
Shank
Make sure that the truck brakes are on

After you hook up the air lines and before moving under the truck, you should?

Walk around the truck to be sure there's nothing
Provide air to the truck system, then pull out the air supply knob
Make sure that the truck brakes are off
All of the above

When lowering the landing gear of a loaded truck,

Lower the gear until it makes firm contact with the ground.
Turn the crank in low gear a few extra turns after the landing gear makes firm contact with the ground.
Lift the truck of the fifth wheel.
All of the above

After the truck has been coupled with the semi-trailer, in what position should you place the front brackets of the trailer, or the landing gear, before moving away?

A half-way with no crank secured.
Halfway.
Fully lifted with the crank securely secured
All of the above

When the air is let out of the trailer emergency line, what happens?

The trailer emergency brakes are applied
The trailer loses all braking power
The truck loses all braking power
The truck is going forward

When hooking with a semitrailer, how should you back the truck up?

at an angle to the trailer.
ahead of the trailer.
ahead of the right wheel.
In front of the lefth

When parking trailers without spring brakes, use ____ to secure the truck safely.

The emergency brakes
The trailer hand brake
Wheel Chocks
11-19 psi

The “normal” position of the trailer air supply control is used to?

Turning off the air.
Apply the emergency brake of the trailer.
Pulling a trailer.
Turning on the air

At the moment you have to back up a trailer, should you position your truck to return?

Curved to the right
Curved to the left
In a straight line
All of the above

Why should the trailer glad hands be locked together or attached to “dead end,” or dummy, couplers when not in use?

To keep dirt out of the lines
To keep air pressure normal
To prevent air from escaping
Back up and unlock the trailer brake.

What should you do before investing a trailer?

Touch your horn several times
Shout a warning
Walk around the truck
All of the above

For safer driving when you are behind other trucks, in good driving conditions, you should maintain at least 1 second between your truck and the truck ahead, for each?

20 feet of long from your truck
30 feet of long from your truck
10 feet of long from your truck
40 feet of long from your truck

In general, how is the upper gravity center of your truck?

Stabler when you take a turn
Easier to make a rollover
Simpler to make a turn at the corner
All of the above

When coupling with a semi-trailer, back off the truck?

At an angle to the trailer.
Directly in front of the trailer.
In front of the right wheel.
All of the above

Should you check your mirrors to see if your trailer is in the right position every time?

Leave the highway
Speed up
Braking hard
When parking

Your trailer has begun to skid. You should?

Use the trailer hand brake to straighten out the rig.
Apply the foot brake hard and come to a full stop.
Release the foot brake to get traction back.
Look at the mirrors

The normal position of the trailer air supply control is used for?

shutting the air off.
putting on the trailer emergency brake.
pulling a trailer.
Nothing will happen at all.

The fastest and best way to recognize that your trailer is skidding is by?

using the mirrors.
feeling pull to the right or left.
watching the reaction of other to your truck.
Back up and unlock the trailer brake.

When hooking a truck and semitrailer, you must lock the kingpin into the fifth wheel. Which is the best way to check the connection?

Drive forward.
Lock the trailer brakes and pull the truck smoothly forward.
Lock the trailer brakes and pull the truck fastly forward.
All of the above

If the air lines get crossed when hooking up to an old trailer, What could happen?

If the trailer has no spring brakes, you can go away, but you wouldn't have trailer brakes
The brake lights won't work, when you put on the brake pedal
The hand valve will activate the truck brakes instead of the trailer brakes
Tandem release arm

After the truck has coupled with the semi truck, in what position should you put the front trailer supports, or landing gear, before driving away?

Partway up without the crank handle secured
Halfway up
Fully raised with the crank handle safely secured
All of the above

Failure to keep the _____ lubricated could cause steering problems because of friction between truck and trailer.

Trailer protection valve
Fifth wheel plate
Glad hands
All of the above

Will the truck protection valve activate if the air pressure falls below?

45 – 65 psi
30 – 55 psi
20 – 45 psi
40-65 psi

You are coupling a truck and semitrailer, and ready to back your trailer under a semitrailer. When is the trailer at the right height?

When the truck and semitrailer are even
When the kingpin is lower than the fifth wheel
When the trailer is raised slightly by the truck as the truck is backed under it
All of the above

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