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

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Open the shut off valve of the rear the first trailer and close the shut off valve at the rear of the second trailer

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Open the shut off valves at the rear of both trailers

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All of the above.

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

Never

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When all the trailers have brakes

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When the road is slippery

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Always

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

Jhonson's bar

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Foot pedal

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Hand valve

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Hand lever

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

Use your mirrors to keep your eyes on your tires

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Correct mirror adjustements can only be check when on a road way with traffic

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Checking mirrors regularly will eliminate blind spots

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None of the above.

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When transporting cargo, inspect the materials and securing devices

Before the trip only and no more.

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Before and after the trip always.

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Within 80 miles after beginning the trip and during every driving break.

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Before the trip, within 50 miles after beginning the trip, after every 3 hours or 150 miles, and during every driving break.

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A dolly converter have

No brakes of their own

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Stop ligths and turn signal

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Separated air tank

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All of the above.

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

Close

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Open

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Open, except the one connected to the rear trailer should be close

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None of the above.

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

Drop 5mph until your eyes adjust

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Do not do anything, how good you can see does not affect the speed

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Slow down

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All of the above.

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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

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Open for the rear of the front trailer and close for the rear of the last trailer

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Close to the rear of front trailers and open for the rear of the last trailer

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None of the above.

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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

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latched . . . open

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latched . . . open

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open . . . latched

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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.

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Your trailer will jackknife.

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The entire vehicle will slide into the other lane.

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Your brakes will fail.

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During a pocket knife, it is better

jam on the brakes.

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release the brakes to regain traction.

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apply the trailer hand brake.

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simply wait for the trailer to straighten out.

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

one inch of space

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a little space

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no space

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1/ 2 inch of space

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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

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The truck itself

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The rear trailer of a double

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The entire rig

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

landing gear

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emergency air line

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service air line

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pintle hook

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

Longer vehicles will offtrack more.

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The rear wheels of a single trailer will deflect more than the rear wheels of a double trailer.

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The rear wheels of the last trailer follow the same path as the front wheels of the tractor.

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The front wheels of the last trailer are most likely to off-track.

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What is a function of the tractor protection valve?

To keep the air in the tractor, if the trailer has a bad leak

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To keep the air in the trailer, if the tractor develops a bad leak

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To indicate that the parking brake is activated

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To prevent air from leaving the tractor if the air pressure falls within the range of 50 to 65 psi

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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.

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the entire emergency air line system is charged.

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the entire service air line system is charged.

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the closing valves on the other trailers) and the dollies are in the closed position.

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Empty or lightly loaded trucks

They have little traction, which facilitates the blocking of the wheels.

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have a shorter stopping time.

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have flexible suspension springs.

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have little chance of jackknifing.

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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

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20

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25

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30

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Average score
Your score

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