Double-Triple Trailers Sample Test B
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Double-Triple Trailers Sample Test B

1. On older vehicles there may be a lever, rather than a knob, for the tractor protection valve. What are the normal and emergency positions?
A The normal position is used for pulling a trailer. The emergency position is used to shut air off to the trailer.
B The normal position is horizontal. The emergency position is vertical.
C The normal position is used for supplying air to the drive wheel brakes. The emergency position is used to substitute for the emergency brakes.

2. Which valves on the service line on the trailer connect the trailer air tanks to the trailer air brakes
A One-way check valves.
B Relay valves.
C Automatic valves.

3. What is one purpose of the emergency air line?
A It allows you to continue your trip when the primary system is malfunctioning.
B It activates an emergency locator transmitter.
C It supplies air to the trailer air tanks.

4. What happens to the trailer emergency brakes if there is a loss of pressure in the emergency line?
A The emergency trailer brakes will fail.
B The emergency trailer brakes will fade.
C The emergency trailer brakes will come on.

5. When the emergency line loses pressure, what happens to the tractor protection value?
A The valve will open.
B The valve will close.
C The valve will pop out.

6. If the air lines on a truck are color coded, which lines are blue?
A The emergency lines.
B The spring line.
C The service line.

7. To connect the glad hands, the tow seals are pressed together with the couplers at what kind of angle to each other?
A A 45 degree angle.
B A 90 degree angle.
C A 180 degree angle.

8. Why should you lock the glad hands to each other when you are not towing any trailers?
A To prevent brake fade.
B To keep the brakes from overheating.
C To keep dirt and water out the lines.

9. If the spring brakes do not release when you push the trailer air supply control, what should you do?
A Unhook the air line connections.
B Check the air line connections.
C Tighten the air line connections.

10. Do trailers made before 1975 have spring brakes?
A Most of them do.
B All of them do.
C Many do not.


Score =
Correct answers:






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