1. Combination vehicles are usually heavier, longer and require more driving skill than single commercial vehicles.
A True
B False
C

2. More than half of truck driver deaths in crashes are the result of truck rollovers. Trucks turn over easier when fully loaded and are:
A Easy to get turned back right.
B Five times more likely to roll over in a crash than empty rigs.
C Ten times more likely to roll over in a crash than empty rigs.

3. The following two things will help prevent rollovers.
A Keep the cargo close to the front and drive slowly around turns.
B Keep the cargo as close to the ground as possible and drive slowly around turns.
C Keep the cargo to the back of the rig and drive the speed limit.

4. When you turn suddenly while pulling doubles, which trailer is most likely to turn over?
A The rear trailer is twice as likely to turn over as the tractor.
B The front trailer is twice as likely to turn over as the tractor.
C Each trailer is equally likely to turn over as is the tractor.

5. Why should you not use the trailer hand brake to straighten out a jackknifing trailer?
A Because the brake handle is too hard to reach.
B Because the brakes on the trailer wheels cause the skid in the first place.
C Because the brakes on the trailer wheels will not respond to the hand brake.

6. What is off tracking?
A When a vehicle goes around a corner, the rear wheels follow a different path than the front wheels.
B When a vehicle goes around a corner, and the driver pulls off the road.
C When a vehicle goes around a curve and turns back the other way.

7. What is a "trailer jacknife?"
A When the tires on a trailer blow out.
B When the wheels of a trailer lock up and the trailer swings around.
C When the wheels of a trailer lock up and the trailer pulls the tractor to a stop.

8. Should you swing wide to the left before starting a 90 degree turn?
A Yes
B No
C

9. Why should you not use the trailer hand valve while driving?
A Because it won't work as well as the foot brake.
B Because you should use the parking brake.
C Because of the danger of making the trailer skid.

10. Describe what the trailer air supply control does.
A It is used to supply the trailer with air, shut the air off and put on the trailer emergency brakes.
B It is a yellow, six sided knob used to control the tractor protection valve.
C It is a device used to keep the trailer behind the tractor.

11. Describe what the service line is for:
A To carry air to the parking brake to control the trailer brakes.
B To carry air to a relay valve that allows the trailer brakes to be applied quickly.
C To carry air to the cab of the rig to cool it.

12. What are other names for the Service Air Line?
A Control line or signal line
B Straight line or control line
C Curved line or signal line

13. What is the emergency air line?
A Air lines connecting the parking brake to the trailer brakes.
B Air lines that control the emergency brakes of the tractor.
C Air lines that control the emergency brakes on combination vehicles.

14. What is the emergency air line for?
A To engage the front brakes of the tractor in case of an emergency.
B To engage the trailer brakes in case of air pressure loss.
C To have extra air pressure in case you need it.

15. Why should you use chocks when parking a trailer without spring brakes?
A Because you don't want the trailer rolling down a hill.
B Because if the air pressure leaks away or down, there will be no brakes.
C Because some states require checking of trailer wheels.