CDL Combination Vehicle Study Guide #3

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To stop a trailer skid you should: *

1 point

Use the trailer hand brakes

Countersteer

Release the brakes

When checking the trailer emergency brakes, the tractor protection control valve should be placed in the ________ position. *

1 point

Emergency

Normal

Neutral

If you have coupled with a semi-trailer, where should the front trailer supports be before driving away? *

1 point

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

Option 1

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When should you use chocks to park a trailer not equipped with spring brakes? *

1 point

Never

Always

Only when it will be parked on an incline

Describe what the service line is for? *

1 point

To carry air to the parking brake to control the trailer brakes

To carry air to a relay valve that allows the trailer brakes to be applied quickly

To carry air to the cab of the rig to cool it

When should you use the hand valve to park a combination vehicle? *

1 point

To park at loading docks

To park on a grade

Never

Combination vehicles are usually heavier, longer, and require more driving skill than single commercial vehicles. *

1 point

True

False

The fifth wheel locking lever is not locked after the jaws close around the kingpin. This means that: *

1 point

The trailer will not swivel on the fifth wheel

The parking lock is off and may drive away

The coupling is not right and should be fixed before driving the coupled unit

What is the emergency air line for? *

1 point

To engage the front brakes of the tractor in case of an emergency

To engage the trailer brakes in case of an emergency

To have extra air pressure in case you need it

The best way to tell if your trailer has started to skid is to: *

1 point

Hear the wheels skidding

See it in your mirrors

Feel for “pulling” in the cab

You want to inspect the trailer supports. You should place the tractor transmission in which gear after you have uncoupled the trailer? *

1 point

Low reverse

Neutral

High Reverse

You are uncoupling a trailer. After you shut off the trailer air supply and lock the trailer brakes, you should: *

1 point

Begin to lower trailer landing gear

Immediately put on your tractor parking brakes

Back up gently to ease pressure on the fifth wheel locking jaws

Describe what the trailer air supply control does: *

1 point

It is used to supply the trailer with air, shut the air off, and put on the trailer emergency brakes

It is a yellow, six-sided knob used to control the tractor protection valve

It is a device used to keep the trailer behind the tractor

When a vehicle is carrying a load at night which extends four feet or more beyond the rear of the body, there must be _____ at the extreme end of the load. *

1 point

2 red lights

1 red flag

2 red flags

A tractor with a(n) ____ trailer requires the shortest amount of stopping distance. *

1 point

Empty

Lightly loaded

Fully loaded

You should swing wide to the left before starting a 90 degree turn to the right? *

1 point

Yes

More than half of truck driver deaths in crashes are the result of rollovers. Trucks turn over easier when fully loaded and are: *

1 point

Two times more likely to roll over in a crash than empty rigs

Five times more likely to roll over in a crash than empty rigs

Ten times more likely to roll over in a crash than empty rigs

What gear should the tractor be in after you uncouple from the trailer and are inspecting the trailer supports? *

1 point

Neutral

Low reverse

High reverse

How long does it take a typical tractor-trailer to clear a single track? A double track? *

1 point

It takes 10 seconds to clear a single track, and more than 12 seconds to clear a double track

It takes 7 seconds to clear a single track, and more than 10 seconds to clear a double track

It takes 14 seconds to clear a single track, and more than 15 seconds to clear a double track

What are the other names for the service air line? *

1 point

Control line or signal line

Straight line or control line

Curved line or signal line

What is a tractor jackknife? *

1 point

When you lock up the tires on the trailer and the trailer spins out sideways as the tractor continues to push forward

When you lock up the drive tires on the tractor and the tractor spins out sideways as the trailer continues to push forward

Neither of these answers are correct

A trailer is most likely to jackknife when it is: *

1 point

Loaded to full capacity

Overloaded

Empty

Why should you not use the trailer hand brake to straighten out a jackknifing trailer? *

1 point

Because the brake handle is too hard to reach

Because the brakes on the trailer wheels caused the skid in the first place

Because the brakes on the trailer wheels will not respond to the hand brake

Why should you use chocks when parking a trailer without spring brakes? *

1 point

Because you don’t want the trailer rolling down a hill

Because if the air pressure leaks away or down, there will be no brakes

Because some states require chocking of trailer wheels

When you turn suddenly while pulling doubles, which trailer is most likely to turn over? *

1 point

The rear trailer is twice as likely to turn over as the tractor

The front trailer is twice as likely to turn over as the tractor

Each trailer is equally likely to turn over as the tractor

What is the emergency line? *

1 point

Air lines connecting the parking brake to the trailer brakes

Air lines that control the emergency brakes of the tractor

Air lines that control the emergency brakes on combination vehicles

You have pushed in the trailer supply valve. You should not move the tractor until the whole air system is: *

1 point

Empty

At normal pressure

Between 60 and 80 PSI

Which of these vehicles off-track the most? *

1 point

5-axle tractor towing a 52-foot trailer

5-axle tractor towing a 45-foot trailer

5-axle tractor towing a 42-foot trailer

Why should you not use the trailer hand valve while driving? *

1 point

Because it won’t work as well as the foot brake

Because you should use the parking brake

Because of the danger of making the trailer skid

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