1 / 20
A. The center of the kingpin lines up with the locking jaws
B. The kingpin rests on the fifth wheel
C. The trailer will be raised slightly when the converter dolly is backed under it
Make sure trailer height is correct. It must be slightly lower than the center of the fifth wheel, so trailer is raised slightly when dolly is pushed under.
2 / 20
A. Use stab or controlled braking
B. Restore traction to the tires
C. Counter steer and accelerate
When any vehicle starts to skid, you must act to restore traction to the wheels.
3 / 20
B. Any time you must
C. When the road is dry
You should never disconnect the steering axel brakes.
4 / 20
A. The shortest trailer
B. The heaviest trailer
C. The lightest trailer
For the safest handling on the road, the more heavily loaded semitrailer should be in first position behind the tractor. The lighter trailer should be in the rear.
5 / 20
A. Allow more following distance than for smaller vehicles
B. Do both things
C. Use special care in bad weather and mountain conditions
Be more careful in adverse conditions like bad weather, slippery conditions, and mountain driving, you must be especially careful if you drive double and triple trailers. You will have greater length and more dead axles to pull with your drive axles than other drivers. There is more chance for skids and loss of traction.
6 / 20
A. Downshift after you enter the curve
B. Slowing to a safe speed before entering the curve, then accelerate slightly during the curve
C. Braking during the turn
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.
7 / 20
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.
8 / 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.
9 / 20
A. Open, latched
B. Open, free
C. Closed, latched
Converter dolly air tank drain valve are closed, and make sure pintle hook is latched.
10 / 20
A. a coupling device that converts the electricity between a semitrailer and a tractor-trailer for international trucking
B. an electronic device that connects the electric power from a semitrailer to the rear of a tractor-trailer
C. a coupling device that connects a semitrailer to the rear of a tractor-trailer
A converter gear on a dolly is a coupling device of one or two axles and a fifth wheel by which a semitrailer can be coupled to the rear of a tractor trailer combination forming a double bottom rig.
11 / 20
A. opening the air tank petcock
B. using the dolly's parking brake control
C. doing both of the above
Release dolly brakes by opening the air tank petcock, or, if the dolly has spring brakes, use the dolly parking brake control.
12 / 20
A. Drive forward, brake suddenly, and see if the rear semitrailer hits the one in front of it
B. Pull against the rear semitrailer's pin
C. Drive forward slowly and see if the rear semitrailer stays attached
Test coupling by pulling against pin of the rear semitrailer
13 / 20
A. flash your high-beam headlights on and off several times
B. step on and off the brake pedal several times
C. keep pressing the brake pedal firmly
Charge the trailer air brake system. Shut the engine off. Step on and off the brake pedal several times to reduce the air pressure in the tanks. The trailer air supply control should pop out or go from "normal" to "emergency" position when the air pressure falls into the pressure range specified by the manufacturer. Usually within the range of 20 to 45 psi.
14 / 20
A. leaks of air or hydraulic fluid
B. dirt or grime
C. leaks of water or gasoline
If the landing gear is power operated, make sure there are no air or hydraulic leaks.
15 / 20
A. you do not have to use a converter dolly
B. you couple the third trailer to the second trailer before you couple them to the first trailer
C. you couple the second trailer to the first trailer and then couple them both to the tractor
A triple combination vehicle has four units (not counting the converter dollies): a tractor and three trailers. You couple a triple as follows: 1. Couple the first trailer to the tractor the same way that you couple any combination vehicle. 2. Couple the third trailer to the second trailer using the method for coupling doubles (which will involve the use of a converter dolly). 3. Move another converter dolly into position. 3. Couple the tractor and first trailer to the second and third trailer using the method for coupling doubles (which will involve another converter dolly).
16 / 20
A. 75 to 100 psi
B. 50 to 75 psi
C. 20 to 45 psi
The trailer air supply control should pop out or go from "normal" to "emergency" position when the air pressure falls into the pressure range specified by the manufacturer. Usually within the range of 20 to 45 psi.
17 / 20
A. Check for normal air pressure. Release the parking brakes. Apply the trailer brakes, using the hand control if so equipped. Step off the brakes and pull forward slowly.
B. Check for normal air pressure. Release the parking brakes. Pull forward slowly
C. Apply the trailer brakes, using the hand control if so equipped. Release the trailer's parking brakes. Check for normal air pressure. Pull forward slowly.
D. Apply the trailer brakes, using the hand control if so equipped
Wait for normal air pressure, release the parking brake, move the vehicle forward slowly about five mph, and apply the brakes firmly using the trailers hand control. Note any vehicle pulling to one side, unusual feel, or delayed stopping action.
18 / 20
A. the parking brake valve will pop out
B. the tractor protection valve control (trailer air supply control) will pop out or go from "normal" to "emergency."
C. the low air pressure warning signal will come on
The trailer air supply control also called the tractor protection valve control should pop out or go from "normal" to "emergency" position when the air pressure falls into the pressure range specified by the manufacturer usually within the range of 20 to 45 psi.
19 / 20
A. park the vehicle at a 45-degree angle on level ground
B. park the vehicle in a straight line on firm level ground
C. park the vehicle at a 45-degree angle on an incline
Park rig in a straight line on firm level ground
20 / 20
A. a yellow lamp on the left side
B. a white lamp on the right side
C. a white lamp on the left side
Converter dollies built on or after March 1, 1998, are required to have antilock brakes. These dollies will have a yellow lamp on the left side of the dolly.