Doubles/Triples Test 3 - Crist CDL's Online Testing Center

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Doubles/Triples Test 3
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When should you check your mirrors while making a lane change?

a. After signaling the change

b. Right after starting the lane change

c. After completing the lane change

d. All of the above

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

a. Always keep your vehicle to the right side of your lane

b. You should avoid traveling next to others when possible

c. High winds are not a problem for doubles and triples

d. All of the above

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

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

b. A triple bottom rig can stop quicker that a 5 axle tractor semi trailer due to off tracking

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

d. None of the above

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

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

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

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

d. Get out and listen for air flowing through the lines

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

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

b. The kingpin rests on the fifth wheel

c. The center of the kingpin lines up with the locking jaws

d. All of the above

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

a. Make sure the trailer will roll freely when coupling

b. Hook the trailer electric cord to a portable generator for braking power.

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

d. Couple the trailer to the tractor, everything is ok

Which of these in not a good thing to do when driving on slippery roads?

a. Use the engine brake or speed retarder

b. Use a light touch on the accelerator and brake pedals

c. Keep other traffic out of you side space

d. None of the above

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

a. There is really no need to slow down for a curve

b. Downshift after you enter the curve

c. Braking during the turn

d. Slowing to a safe speed before entering the curve, then accelerate slightly during the curve

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

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

b. You will have a trailer jackknife

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

d. None of the above

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

a. 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

b. Close the shut off valves at the rear of both trailers

c. Open the shut off valves at the rear of both trailers

d. None of the above

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