Double/Triple

You are driving a 100-feet truck with double trailers at 30 mph. The road is dry and visibility is good. You should keep at least _____ seconds of space ahead of you.

10

You are driving a 100-feet truck with double trailers at 50 mph. The road is dry and visibility is good. You should keep at least ____ seconds of space ahead of you.

11

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

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

Which the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. When you do this, you should hear:

Air escape from the open valve.

If you want to couple a second trailer to your combination vehicle, secure it by using:

All of the above if available.

You are driving on a slippery road during the day. What does the Driver's manual say about how much space you should keep ahead of your truck?

Allow much more space than is needed for ideal driving condition.

The converter dolly air tank drain valve on coupled double/triple trailers should be:

Closed.

You are doing a walkaround inspection of a double or triple trailer rig. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is ____

Closed; Latched.

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

Doubles/triples flip flop over from quick steering moves more easily than many vehicles.

You must drive through deep or flowing water. You should NOT:

Drive through quickly.

During normal operation the brakes of the double/triple trailer are controlled by:

Foot pedal.

The best way to keep brakes from getting to hot while going down long grades is to:

Go slow and use only light, steady pressure on the brakes.

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

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

Which of these statements about emergency steering is true?

If you have traffic on both sides of your vehicle and something is blocking your lane, a move to the right still be best.

Some large trucks have curved (convex or spot) mirrors. These mirrors:

Make things seem smaller and further away than they really are.

Empty Truck:

May have poor traction due to bouncing and wheels lockup.

When does the Driver's manual say you should disable the steering axle brake?

Never.

You are visually checking the coupling of a converter dolly to the rear trailer. How much space should be between the upper and lower fifth wheels?

None.

Converter dollies:

Often do not have spring brakes.

Before you can supply air to the air tanks of a second trailer you need to:

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

When testing the coupling of the double trailer the landing gears of the rear trailer should be:

Partially lowered.

To check if the converter dolly is securely coupled to the rear trailer you should:

Pull gently against the pin of the second trailer.

The best way to stop any skid is to:

Restore traction to the tires.

You are driving at night and you must dim your headlights for traffic. Good speed management says you should:

Slow down.

Which f these will result in the best control on curves?

Slow to the safe speed before entering, then accelerate slightly through the curve.

You want to hook your combination to a second trailer that has no spring brakes. To do this without wheels chocks you should:

Supply air to the trailer air system with the tractor and then disconnect the emergency line.

You wish to turn right from one two-lane, two-way street to another. Your vehicle is so long that you must swing wide to make the turn. Which of these is the correct answer?

Swing wide when you complete the turn.

A converter dolly is still under the second trailer when you unlock the pintle hook. What is likely to happen?

The dolly tow bar may fly up.

When driving a truck with more than one trailer, which trailer should be first behind the truck?

The heaviest.

The crack-the-whip effect that troubles trucks with trailers is most likely to cause a tip over:

The rear trailer of the triple.

You should check trailer height before connecting a converter dolly to a second or third trailer. The trailer height is right when:

The trailer will be raised slightly when the converter dolly is backed under it.

When you turn with the tractor/triple trailer combination the wheels that off-track (cheat) the most are:

The wheels of the last trailer.

You are driving with double trailers and must use your brakes to avoid a crash. For emergency braking you should:

Use controlled or stab braking.

Which of these is NOT a good thing to do when driving on slippery roads?

Use the engine brake or speed retarder.

Which of these statements about managing space to the sides is true?

You should avoid traveling next to others when possible.

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

You will have a trailer jackknife.