Our printable Hawaii CDL Doubles/ Triples Trailers worksheet will help you get 100% ready for your coming exam

How can you be sure that you supplied air to a second trailer?

Check That Air Flows to All Trailers.
 Use the tractor parking brake and/or chock the wheels to bhold the vehicle. Wait for air pressure to reach normal, then push in the red "trailer air supply" knob. This will supply air to the emergency (supply) lines. Use the trailer handbrake to provide air to the service line. Go to the rear of the rig. Open the emergency line shut-off valve at the rear of the last trailer. You should hear air escaping, showing the entire system is charged. Close the emergency line valve. Open the service line valve to check that service pressure goes through all the trailers (this test assumes that the trailer handbrake or the service brake pedal is on), and then close the valve. If you do NOT hear air escaping from both lines, check that the shut-off valves on the trailer(s) and dolly(ies) are in the OPEN position. You MUST have air all the way to the back for all the brakes to work.
[Commercial Driver's License Manual]

Apply the hand valve at 10 mph. You should stop in the same distance as a truck with one trailer at 5 mph.

Watch each trailer’s air gauge for a drop of 30 psi.

Go to the rear of the second trailer and open the emergency line shut-off.

What do you check when making a visual check of coupling ?

Check that there is no space between the trailer apron and the fifth wheel plate, and that the locking jaws are closed around the kingpin while doing a visual inspection of the coupling.

No space between the trailer apron and the fifth wheel. Locking jaws closed on kingpin

Enough space between the trailer apron and the fifth wheel. Locking jaws closed on kingpin

No space between the trailer apron and the sixth wheel. Locking jaws closed on kingpin

Enough grease on the fifth wheel. Locking jaws closed on kingpin

The converter dolly includes a <code>____</code> wheel and <code>____</code> axles.

Because a semitrailer contains a fifth wheel and one or two axles, similar to the rear of a standard tractor, it can be attached to a converter dolly.

Many large vehicles have curved, convex mirrors. Convex mirrors allow drivers to see a wider area than flat mirrors. However, they also make objects seem smaller and farther away than they really are.

Cannot be used on vehicles transporting hazardous materials

Bridges tend to freeze before other parts of the roadway. Be particularly careful on bridges when temperatures are close to the freezing point.

Only once temperatures drop significantly below 32 degrees Fahrenheit

To uncouple the converter dolly you should ______.

Lower the dolly landing gear, detach the safety chains, apply the converter gear spring brakes or block the wheels, release the pintle hook on the first semi-trailer, and carefully pull free of the dolly to uncouple it.

disconnect safety chains, lower the landing gear and chock the wheels

chock the wheels, lower the landing gear and disconnect safety chains

lower the landing gear, disconnect safety chains, and chock the wheels

chock the wheels, disconnect safety chains, and lower the landing gear

When should you check your mirrors while making a lane change?

Before changing lanes, check your mirrors to make sure there is enough room. Check that no one has moved into your blind spot after you've signaled. Always double check to see that your path is clear immediately after staring and completing the lane change.

Which of the following is not a sign of fatigue?

Your awareness is severely affected should you ever in the state of fatigue. This can pose a huge threat to other road users and to yourself if you drive your vehicle while being fatiged.

Since 1998, antilock brakes have been needed on all converter dollies.

have little braking power because they are small.

You are driving a set of doubles. A set of trailer wheels goes into a skid. Which of these is most likely to occur?

Check your mirrors to determine if any of your trailers have started to skid. Do this each time you need to brake quickly. When a trailer's wheels start to slide, the chance of jackknifing increases dramatically. You may not be able to avoid a jackknife if the trailer has entirely exited your lane.

The rig will continue to move in a straight line no matter how much the steering wheel is turned.

The rig will stay in a straight line but slide sideways.

When you pull two or three trailers, you should look farther ahead because __________.

Sudden braking or steering changes are more likely to cause a double or triple combination vehicle to roll over or jackknife. Look far enough ahead to allow you to gradually slow down or change lanes if necessary.

aggressive drivers may cause trouble for you on the road.

the vehicle is more likely to roll over or jackknife.

If you must drive through deep puddles or flowing water, which of these should you not do?

Reduce your speed and shift into a low gear. Apply the brakes gently. This keeps mud, silt, sand, and water out by pressing linings against braking drums or discs.

Gently pressing the brake pedal while driving through the water.

Before you can supply air to the air tanks of a second trailer, you need to ________________.

All air must pass through the tractor's and trailers' air lines — that's it. To allow air to pass to the trailer behind it, open the shut-off valves at the back of each trailer save the last one. To prevent air from escaping, close the shut-off valves at the back of the last trailer.

open the shut-off valves at the rear of the first trailer and close the shut-off valves at the rear of the second trailer.

close the shut-off valves at the rear of both trailers.

open the shut-off valves at the rear of both trailers.

Which of these statements about handling doubles and triples is true?

The rearmost trailer is far more likely to roll over due to rearward amplification (the "crack-the-whip" effect). Avoid making abrupt steering changes that could cause the trailer at the back to roll over.

A triple bottom rig can stop quicker than a 5-axle tractor semi-trailer because of off-tracking.

The rear trailer of a 100-foot triple is less likely to turn over than a single semi-trailer because of the crack-the-whip effect.

A sudden movement with the steering wheel can result in a tipped-over rear trailer.

The converter dolly connects a semitrailer to the rear of a tractor-trailer, forming a double or triple combination.

an electronic device that connects the electric power from a semitrailer to the rear of a tractor-trailer.

a coupling device that connects a semitrailer to the rear of a tractor-trailer.

a coupling device that converts the electricity between a semitrailer and a tractor-trailer for international trucking.

Antilock brakes (ABS) have been required on all converter dollies built since ________________________.

Since March 1, 1997, antilock brakes have been mandatory on all tractors. Since March 1, 1998, antilock brakes have been required on all trailers, converter dollies, buses, and single trucks.

When starting an engine, oil pressure should come up to a normal level ____________.

When starting the engine, have a look at the gauges on your truck. Within seconds of starting a vehicle's engine, the oil pressure in the engine should return to normal.

Which of these statements about quick steering movements and doubles/triples is true?

Trucks with trailers have a dangerous “crack-thewhip” effect. When you make a quick lane change, the crack-the-whip effect can turn the trailer over. There are many accidents where only the trailer has overturned. “Rearward amplification” causes the crack-the-whip effect. Rearward amplification of 2.0 in the chart means that the rear trailer is twice as likely to turn over as the tractor. You can see that triples have a rearward amplification of 3.5. This means you can roll the last trailer of triples 3.5 times as easily as a 5-axle tractor.
[Commercial Driver Handbook]

You should apply the brakes at the same time that you perform quick steering movements.

Doubles/triples flip over from quick steering movements more easily than do many other vehicles.

Countersteering is easier with doubles/triples than with most other vehicles.

Several large trucks have convex, or “spot”, mirrors. These mirrors

Many large vehicles have curved (convex, "fisheye," "spot," "bug-eye") mirrors that show a wider area than flat mirrors. This is often helpful. But everything appears smaller in a convex mirror than it would if you were looking at it directly. Things also seem farther away than they really are. It's important to realize this and to allow for it. [Commercial Driver License Manual]

make things look smaller and farther away than they really are.

do not need to be checked as often as flat mirrors because they show a larger area.

Which of the below options about checking your mirrors is correct?

Free printable Hawaii CDL Doubles/ Triples Trailers worksheet part 6

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