Doubles/Triples Test 1 - Crist CDL's Online Testing Center

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Doubles/Triples Test 1
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When driving with more than one trailer, which trailer should be the first one behind the tractor?

a. The lightest trailer

b. The heaviest trailer

c. The shortest trailer

d. None of the above

You are driving a 100 foot twin trailer combination at 50 mph. The road is dry and the visibility is good. You should keep at least ____ seconds of space ahead of you.

a. 9

b. 10

c. 11

d. 12

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

a. Air escape from the open valve

b. The service brakes slowly move to the fully applied position

c. The emergency line valve open and release air

d. None of the above

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

a. Push the brake pedal as hard as you can and hold it there

b. Use only the trailer brakes

c. Use controlled or stab braking

d. None of the above

Converter dollies:

a. Have little braking power because they are small

b. Often do not have spring brakes

c. Usually need a glad hand converter

d. All of the above

The crack the whip effect that troubles trucks with trailers. Which is most likely to tip over:

a. The rear trailer of a double

b. A full trailer behind a truck

c. The rear trailer of a triple

d. Any trailer

You are doing a walk around 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 ____.

a. Open, latched

b. Open, free

c. Closed, latched

d. Closed, free

When does the "driver's manual" advise disconnecting the steering axle brakes to help keep the rig straight?

a. When the road is dry

b. Any time you have to

c. When the road is slippery

d. Never

If a converter dolly is still under the second trailer and you unlock the pintle hook, what will probably happen?

a. The dolly tow bar may fly up

b. The air lines will rupture

c. The trailer brakes will unlock

d. Nothing, the weight of the trailer will keep it in place

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 wheel?

a. It depends on the load

b. None

c. 1/2 to 3/4 of an inch

d. 1/32 to 3/32 of an inch

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