Doub/Trips Test 1

1. When driving with more than one trailer, which trailer should be the first one behind the tractor?
The lightest trailer
The heaviest trailer
The shortest trailer
None of the above

2. 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.

3. 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:
Air escape from the open valve
The service brakes slowly move to the fully applied position
The emergency line valve open and release air
None of the above

4. You are driving with double trailers and must use your brakes to avoid a crash. For emergency braking you should:
Push the brake pedal as hard as you can and hold it there
Use only the trailer brakes
Use controlled or stab braking
None of the above

5. Converter dollies:
Have little braking power because they are small
Often do not have spring brakes
Usually need a glad hand converter
All of the above

6. The crack the whip effect that troubles trucks with trailers. Which is most likely to tip over:
The rear trailer of a double
A full trailer behind a truck
The rear trailer of a triple
Any trailer

7. 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 ____.
Open, latched
Open, free
Closed, latched
Closed, free

8. When does the "driver's manual" advise disconnecting the steering axle brakes to help keep the rig straight?
When the road is dry
Any time you have to
When the road is slippery

9. If a converter dolly is still under the second trailer and you unlock the pintle hook, what will probably happen?
The dolly tow bar may fly up
The air lines will rupture
The trailer brakes will unlock
Nothing, the weight of the trailer will keep it in place

10. 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?
It depends on the load
1/2 to 3/4 of an inch
1/32 to 3/32 of an inch