Combination Vehicles Sample Test B
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Combination Vehicles Sample Test B

1. Before driving away, how can you always test the trailer brakes?
A With the hand valve or by pulling the tractor protection valve and then pulling against the brakes in a low gear.
B With the hand valve or by pulling the tractor protection valve, and accelerating.
C With the hand valve or by pulling the tractor protection valve, and pulling against the brakes gently at a maximum speed.

2. How are the air tanks on trailers and converter dollies filled?
A By the tractor protection valve.
B By the air compressor cut off valve.
C By the emergency supply line from the tractor.

3. What tells how much pressure the relay valves should send to the trailer brakes?
A The position of the foot pedal.
B The position of the brake linings.
C The pressure in the service line.

4. In what position should the air line shut off valves be when you check them?
A They should be in the open position except at the back of the last trailer.
B The should be in the open position.
C They should be in the closed position.

5. What should you use to be safe when you park trailers that don't have spring brakes?
A Use wheel chocks
B Use available rocks.
C Use the curb.

6. What happens if (only) the service line comes apart while you are driving?
A You may not notice anything until you try to put the brakes on when air loss from the leak will quickly lower the air tank pressure.
B Nothing will happen.
C You will hear a loud explosion.

7. Why must the fifth wheel plate have enough grease?
A To prevent sparks - and smoke.
B To prevent squealing.
C To prevent steering problems.

8. Before backing up how should you position the tractor in relation to the trailer?
A Slightly to the left of the trailer.
B Slightly to the left of the center of the trailer.
C Directly in front of the trailer.

9. Before you back under a semi-trailer in coupling your tractor at what height should the trailer be?
A Four feet eight inches.
B Well above the top of the fifth wheel.
C Just below the middle of the fifth wheel.

10. You have connected the air lines but have not yet backed under the trailer. What should you do?
A Check the light connections.
B Supply air to the trailer electrical system.
C Supply air to the trailer system.


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