Combination Vehicles Sample Test C
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Combination Vehicles Sample Test C

1. 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.

2. 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

3. 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.

4. 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.

5. 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.

6. The dolly tow bar may fly up if you unlock the pintle hook with the converter dolly still under the rear trailer.
A True
B False
C

7. You should use different methods for uncoupling second and third trailers.
A True
B False
C

8. Coupling and uncoupling methods are the same for more common tractor-trailer combinations, but there are other ways of coupling and uncoupling the many types of truck-trailer combinations that are in use.
A True
B False
C

9. There are more things to inspect on a combination vehicle than on a single vehicle.
A True
B False
C

10. Should you do a walk around inspection when preparing to pull Doubles or Triples?
A Yes
B No
C

 


Score =

Correct answers:






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