Doubles And Triples Eng 4

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

Close the shut off valve at the rear of the first trailer and open the shut off valve at the rear of the second trailer
Open the shut off valve of the rear the first trailer and close the shut off valve at the rear of the second trailer
Open the shut off valves at the rear of both trailers
All of the above.

What does the driver’s manual say should deactivate the steering axle brakes?

Never
When all the trailers have brakes
When the road is slippery
Always

During normal operation, the brakes on double or triple trailers are controlled by?

Jhonson's bar
Foot pedal
Hand valve
Hand lever

Which of these answers about checking your mirrors is true??

Use your mirrors to keep your eyes on your tires
Correct mirror adjustements can only be check when on a road way with traffic
Checking mirrors regularly will eliminate blind spots
None of the above.

When transporting cargo, inspect the materials and securing devices

Before the trip only and no more.
Before and after the trip always.
Within 80 miles after beginning the trip and during every driving break.
Before the trip, within 50 miles after beginning the trip, after every 3 hours or 150 miles, and during every driving break.

A dolly converter have

No brakes of their own
Stop ligths and turn signal
Separated air tank
All of the above.

For double and triple couple towing, the entire shut-off valve on the converter platform must be

Close
Open
Open, except the one connected to the rear trailer should be close
None of the above.

You are driving at night and need to dim traffic lights. Good management says that you should

Drop 5mph until your eyes adjust
Do not do anything, how good you can see does not affect the speed
Slow down
All of the above.

Which of these is the correct position for the closing valves in doubles and triples?

Close to the rear of both the front and the last trailers
Open for the rear of the front trailer and close for the rear of the last trailer
Close to the rear of front trailers and open for the rear of the last trailer
None of the above.

When performing a visual inspection of a double or triple trailer, the shut-off valves must be _____ on the rear (s) of the front trailer (s) and ________ on the rear of the last trailer.

open . . . closed
latched . . . open
latched . . . open
open . . . latched

Which of the following options will likely occur if you drive a double deck and a set of tow wheels enters a skate?

Nothing? the wheels will straighten quickly.
Your trailer will jackknife.
The entire vehicle will slide into the other lane.
Your brakes will fail.

During a pocket knife, it is better

jam on the brakes.
release the brakes to regain traction.
apply the trailer hand brake.
simply wait for the trailer to straighten out.

While inspecting the converter coupling, you must ensure that there is _______ between the upper and lower fifth wheel.

one inch of space
a little space
no space
1/ 2 inch of space

Trucks with trailers have a dangerous “breaking the whip” effect. Because of this, which of the following parts of the vehicle is more likely to tip over?

The rear trailer of a triple
The truck itself
The rear trailer of a double
The entire rig

When uncoupling, you should never unlock the _______ with the dolly under the rear trailer.

landing gear
emergency air line
service air line
pintle hook

You are driving a tractor with multiple trailers. Which of the following statements about deviation is true?

Longer vehicles will offtrack more.
The rear wheels of a single trailer will deflect more than the rear wheels of a double trailer.
The rear wheels of the last trailer follow the same path as the front wheels of the tractor.
The front wheels of the last trailer are most likely to off-track.

What is a function of the tractor protection valve?

To keep the air in the tractor, if the trailer has a bad leak
To keep the air in the trailer, if the tractor develops a bad leak
To indicate that the parking brake is activated
To prevent air from leaving the tractor if the air pressure falls within the range of 50 to 65 psi

Open the shut-off valve of the emergency line on the back of the last trailer and listen for air to escape. This means

there is a leak somewhere in the service air line.
the entire emergency air line system is charged.
the entire service air line system is charged.
the closing valves on the other trailers) and the dollies are in the closed position.

Empty or lightly loaded trucks

They have little traction, which facilitates the blocking of the wheels.
have a shorter stopping time.
have flexible suspension springs.
have little chance of jackknifing.

If you drive a triple from 200 feet to 35 mph, what is the minimum amount of space (in seconds) you must keep ahead?

10
20
25
30

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