1 / 20
A. Go to the rear of the second trailer and open the emergency line shut off
B. Watch each trailers 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
Use the tractor parking brake and/or chock the wheels to hold the vehicle. Wait for air pressure to reach normal, then push in the red "trailer air supply" knob. This will supply air to the emergency (supply) lines. Open the emergency line shut-off valve at the rear of the last trailer. You should hear air escaping, showing the entire system is charged.
2 / 20
A. The airlines will rupture
B. The dolly tow bar may fly up
C. The trailer brakes will unlock
Never unlock the pintle hook with the dolly still under the rear trailer. The dolly tow bar may fly up, possibly causing injury, and making it very difficult to re-couple.
3 / 20
A. 1/2 to 3/4 inch
B. None
C. It depends on the load
Check that the trailer is lying flat on the fifth wheel skid plate with no gap.
4 / 20
A. release the brakes on the converter dolly
B. slowly pull clear of the converter dolly
C. uncouple the converter dolly
Slowly pull clear of dolly.
5 / 20
A. usually need a glad hand converter
B. sometimes do not have antilock brakes
C. have little braking power because they are small
All converter dollies built since 1998 are required to have antilock brakes
6 / 20
A. Make sure the trailer will roll freely when coupling
B. Supply air to the trailer air system with the tractor and then disconnect the emergency line
C. Hook the trailer electric cord to a portable generator for braking power
If the second trailer doesn't have spring brakes, drive the tractor close to the trailer, connect the emergency line, charge the trailer air tank, and disconnect the emergency line. This will set the trailer emergency brakes if the slack adjusters are correctly adjusted.
7 / 20
A. Are the easiest to stop since there is no shifting cargo
B. Require shorter stopping distances than full ones
C. May have poor traction due to bouncing and wheel lockup
Empty trucks require greater stopping distances because an empty vehicle has less traction.
8 / 20
A. that you can back out of.
B. that you can pull straight through
C. that is as close as possible to your destination
Make sure you do not get in a spot you cannot pull straight through. You need to be aware of how parking lots are arranged to avoid a long and difficult escape
9 / 20
A. The emergency line valve open and release air
B. Air escapes from the open valve
C. The service brakes slowly move to the fully applied position
Open the service line valve, listen for air to escape, and then close the valve.
10 / 20
A. Keep other traffic out of you side space
B. Use the engine brake or speed retarder
C. Use a light touch on the accelerator and brake pedals
When your drive wheels have poor traction, the retarder may cause them to skid. Therefore, you should turn the retarder off whenever the road is wet, icy, or snow covered.
11 / 20
A. neither more nor less
B. more
C. less
Take special care when pulling two and three trailers. There are more things that can go wrong, and doubles/triples are less stable than other commercial vehicles.
12 / 20
A. 12
B. 11*10
One good rule says you need at least one second for each 10 feet of vehicle length at speeds below 40 mph. At greater speeds, you must add 1 second for safety.
13 / 20
A. 12
B. 11
C. 10
One good rule says you need at least one second for each 10 feet of vehicle length at speeds below 40 mph. At greater speeds, you must add 1 second for safety.
14 / 20
A. Use the engine brake or speed retarder
B. Keep other traffic out of you side space
C. Use a light touch on the accelerator and brake pedals
When your drive wheels have poor traction, the retarder may cause them to skid. Therefore, you should turn the retarder off whenever the road is wet, icy, or snow covered.
15 / 20
A. Downshift after you enter the curve
B. Braking during the turn
C. Slowing to a safe speed before entering the curve, then accelerate slightly during the curve
Slow down to a safe speed, and downshift to the right gear before entering the curve. This lets you use some power through the curve to help the vehicle be more stable while turning.
16 / 20
A. Use controlled or stab braking
B. Use only the trailer brakes
C. Push the brake pedal as hard as you can and hold it there
You should brake in a way that will keep your vehicle in a straight line and allow you to turn if it becomes necessary. You can use the controlled braking method or the stab braking method.
17 / 20
A. Open, latched
B. Closed, latched
C. Open, free
Converter dolly air tank drain valve are closed, and make sure pintle hook is latched.
18 / 20
A. the fifth wheel and the landing gear
B. the trailers and the radios in the tractor
C. the shut-off valves, the converter dolly or dollies, and the air brakes on all trailers
To inspect a double or triple, first inspect it just as you would inspect any combination vehicle. Then check that the shut-off valves are open on all trailers but the last trailer. Check each converter dolly to be sure that the pintle hook is properly latched.
19 / 20
A. Drive forward slowly and see if the rear semitrailer stays attached
B. Pull against the rear semitrailer's pin
C. Drive forward, brake suddenly, and see if the rear semitrailer hits the one in front of it
Test coupling by pulling against pin of the rear semitrailer
20 / 20
A. to disconnect the safety chains
B. to slowly pull clear of it.
C. to lower its landing gear
Lower dolly landing gear.
1 / 20
Progress
0
Errors