CDL Class A License Test 1 Flashcards

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Questions and Answers

You supply air to the trailer tanks by?

Pushing in the trailer air supply valve (correct)

Connecting the service line gland hand

Pulling out the trailer air supply valve

A driver crosses the air lines when hooking up to an old trailer with no spring brakes. What will happen?

The brake pedal will work the trailer spring brakes not the trailer brakes

The driver could drive away with no trailer brakes (correct)

The hand valve will apply the tractor brakes not the trailer brakes

Gland hands are used to connect the:

Electric lines from the truck to the trailer

Service and emergency air lines from the truck to the trailer (correct)

Kingpin from the tractor to the locking jaws on the glide plate

After you connect the air lines, but before you back under the trailer, you should?

Supply air to the trailer system, then pull the air supply knob Signup and view all the answers

To unlock the fifth wheel pull the release handle to the______ position.

Open Signup and view all the answers

For a coupling to be complete, the safety catch for the fifth wheel locking lever must be?

Over the locking lever Signup and view all the answers

Which part of the kingpin should the locking jaws close around?

The shark Signup and view all the answers

Why should you be sure that the fifth wheel plate is greased as required?

To prevent steering problems Signup and view all the answers

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

Never Signup and view all the answers

The trailer air supply should automatically close when the air pressure falls to between_____ Psi.

20 and 45 Signup and view all the answers

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

See it in your mirrors Signup and view all the answers

When coupling, the proper position of the fifth wheel is?

Tilted down towards the end of the tractor Signup and view all the answers

A trailer is most likely to jackknife when it is?

Empty Signup and view all the answers

If the spring brakes don't release when you push the trailer air supply control, you should?

Check the air connection lines Signup and view all the answers

The front trailer supports are up and the trailer is resting on the tractor; make sure?

There is enough clearance between the tractor frame and landing gear Signup and view all the answers

Total stopping distance for vehicles with air brakes is longer than that for vehicles with hydraulic brakes due to______ distance.

Brake lag Signup and view all the answers

Some air brake systems have an alcohol evaporator. What may happen if you don't keep the unit filled with alcohol?

Ice may form in the air storage tanks and cause the brakes to fail. Signup and view all the answers

What is emergency stab braking?

Brake hard, release brakes when wheels lock, and reapply the brakes when the wheels start rolling. Signup and view all the answers

Study Notes

Air Supply and Trailer Coupling

Air is supplied to the trailer tanks by pushing in the trailer air supply valve.
When air lines are crossed during hookup to an old trailer without spring brakes, the driver could end up driving away without trailer brakes.
Gland hands are used to connect service and emergency air lines from the truck to the trailer.

Pre-Coupling Checks

After connecting air lines but before backing under the trailer, supply air to the trailer system and then pull the air supply knob.

Fifth Wheel Operations

To unlock the fifth wheel, pull the release handle to the open position.
For a complete coupling, ensure the safety catch for the fifth wheel locking lever is over the locking lever.
The locking jaws should close around the head of the kingpin, referred to as "the shark".

Vehicle Control and Safety

Greasing the fifth wheel plate prevents steering problems.
The hand valve should never be used to park a combination vehicle.
The trailer air supply automatically closes when air pressure falls between 20 and 45 PSI.

Skidding and Coupling Position

The best way to detect if a trailer has started to skid is by observing it in your mirrors.
During coupling, the fifth wheel should be tilted down towards the end of the tractor.
A trailer is most likely to jackknife when it is empty.

Brake Systems and Maintenance

If spring brakes do not release after pushing the trailer air supply control, check the air connection lines.
Ensure there is enough clearance between the tractor frame and landing gear when the trailer is resting on the tractor.
Air brake vehicles experience longer total stopping distances due to brake lag.

Alcohol Evaporators and Emergency Braking

In air brake systems with an alcohol evaporator, lack of alcohol could lead to ice formation in air storage tanks, causing brake failure.
Emergency stab braking involves braking hard, releasing once the wheels lock, and reapplying when they start rolling.

Service Brake Check

Regularly check that service brakes are functioning properly to ensure safety.

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Description

Test your knowledge for the CDL Class A License with these flashcards. Cover essential topics, including air supply to trailer tanks and handling air line connections. Perfect for drivers preparing for the licensing exam.