CDL Combination Vehicle Study Guide #2

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Your emergency air line breaks or gets pulled apart while you are driving. The loss of pressure will cause the: *

1 point

Air compressor to unload instead of pumping air

Emergency trailer brakes to come on

Trailer supply valve to open

Glad hands are used to connect the: *

1 point

Electric lines from the tractor to trailer

Kingpin from the trailer to the locking jaws of the fifth wheel

Service and emergency air lines from the truck to the trailer

If the service line comes apart while you are driving a combination vehicle, but the emergency line stays together, what will happen right away? *

1 point

The trailer’s tank will exhaust through the open line

The emergency trailer brakes will come on

Nothing is likely to happen until you try to apply the brakes

Which type of truck-trailer combination has the best chance of the “crack the whip” rollover? *

1 point

A single tractor-trailer

A tractor pulling 3 trailers

A tractor pulling 2 trailers

Air and electrical lines from the tractor to the trailer should be: *

1 point

Resting on the frame of the tractor

Pulled tight with very little slack

Secured, but with enough slack for turns

After the trailer has been coupled to the tractor, the tractor protection control valve should be placed in what position? *

1 point

Down

Normal

While checking if the tractor is securely coupled to the trailer, the landing gear should be: *

1 point

Fully lowered

Fully raised

Slightly raised

You are coupling a tractor to a semi-trailer. You have connected the air lines. Before backing under the trailer you should: *

1 point

Supply air to the trailer system, then pull out the air supply knob

Pull ahead to test the glad hands connections

Make sure that the trailer brakes are off

The safest way to make a turn without entering another traffic lane is: *

1 point

You should turn wide before you start the turn

You should turn wide as you complete the turn

You should not make a turn and move to another place where you can make a turn without crossing other lanes

After you have coupled the trailer you should have to raise the landing gear by using: *

1 point

Low gear

Intermediate

High gear

When you are uncoupling a loaded trailer lower the landing gear until it: *

1 point

Makes contact with the ground and leave the trailer off the fifth wheel

Makes contact with the ground

Reaches the ground

The trailer is coupled to the tractor and the trailer landing gear is up. Before driving, make sure: *

1 point

There is enough clearance between the upper and lower fifth wheels

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

The safety latch is in unlocked

Which trailers are most likely to get stuck on railroad tracks? (Select three) *

1 point

Lowboy trailers. A low slung unit

Possum-belly livestock trailers. A low slung unit

Tandem axle tractor pulling a flatbed

Single axle tractors pulling a short trailer. A low slung unit

Required

To unlock the fifth wheel, pull the release handle to the _____ position. *

1 point

Neutral

Open

Closed

When coupling, the proper position of the fifth wheel is: *

1 point

Level with the ground

Tilted down toward the end of the tractor

Tilted up toward the end of the tractor

Where should the tractor be when you inspect landing gear after uncoupling the trailer? *

1 point

With the tractor frame under the trailer

Completely cleared from the trailer

With the fifth wheel directly beneath the kingpin

Off-tracking or cheating causes which of these to follow the wider pass while making a turn? *

1 point

53-feet bobtail

Tractor with a 45-foot trailer

Tractor with two 27-foot trailers

How much space should be between upper and lower fifth wheel after coupling? *

1 point

Just enough to see light through it

About 1/4 inch

None

What statement best explains “crack the whip effect”? *

1 point

When you make a quick lane change or sudden movement with your steering wheel, the rear trailer tends to swing out. The force of the rear trailer becomes amplied, causing it to roll over (rearward amplication)

Your trailer is half full and the cargo is loaded in the front of the trailer. When you make a sudden steering wheel movement cargo will tend to forcefully slide to the back of the trailer, forcing the trailer to roll over

When you make a quick lane change or sudden movement with your steering wheel, the tractor tends to rock and sway. The velocity of the rearmost trailer forces the tractor to roll over before the trailer

You have pushed the trailer air supply valve. You shouldn’t back a tractor under a trailer until the whole air system is: *

1 point

At normal pressure

Empty

Between 60 and 80 PSI

A driver crosses the air lines when hooking up to an old trailer. What will happen? *

1 point

The hand valve will apply the tractor brakes instead of the trailer brakes

If the trailer has no spring brakes, you could drive away but you wouldn’t have trailer brakes

The brake lights will come on when the brake pedal is pressed

When driving a set of doubles it is necessary to close which shutoff valve in the which trailer? *

1 point

Front

Back

Middle section

When connecting the glad hands press the two seals with the coupler together at what degree to each other? *

1 point

45 degrees

90 degrees

180 degrees

If the brakes are not released when you pushed the trailer air supply valve you should: *

1 point

Check air line connection

Cross the air lines

Check electrical cable

When backing a tractor under a trailer you should: *

1 point

Do it quickly to ensure that the kingpin is locked into the fifth wheel

Always use lowest reverse gear

Always approach the trailer at a slight angle

The hand valve should be used: *

1 point

As a parking brake

Only with a foot brake

To test the trailer brakes

After you lock the kingpin into the fifth wheel, you should check the connection by pulling: *

1 point

Forward 50 feet, turning right and left

The tractor ahead gently with the trailer brakes locked

The tractor ahead sharply to release the trailer brakes

Under good driving conditions, you should leave at least one second of space between your vehicle and the vehicle ahead for every ____ feet of your vehicle’s length. *

1 point

In general, the higher your truck’s center of gravity, the: *

1 point

Easier it is to turn around corners

More stable it is when turning

Easier it is to turn over

Compared to a straight truck or bus there are ____ things to inspect in combination vehicles. *

1 point

Fewer

The same number

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