16. If you do not have automatic tank drains, how often should you drain the oil and water from the bottom of compressed air storage air tanks?
a. After every four hours of service.
b. At the end of each day of driving.
c. Once a week.
d. Every other week.
17. You should know that your brakes are fading when:
a. you have to push harder on the brake pedal to control your speed on a downgrade.
b. the brake pedal feels spongy when pressure is applied.
c. pressure on the brake pedal is released and speed increases.
d. less pressure is needed on the brake pedal for each stop.
18. If your vehicle has an alcohol evaporator, every day during cold weather you should:
a. change the alcohol from a new bottle.
b. clean the air filter with alcohol.
c. check the oil for alcohol content.
d. check and fill the alcohol level.
19. Why drain water from compressed air tanks?
a. The low boiling point of water reduces braking power.
b. Water can freeze in cold weather and cause brake failure.
c. Water cools the compressor too much.
d. To keep from fouling the air compressor oil.
20. To test air service brakes, you should brake firmly when moving slowly forward. The brakes are OK if you notice:
a. the vehicle "e;pulls"e; to one side.
b. an unusual feel.
c. a delayed stopping action.
d. none of the above.
21. For long downhill grades, experts recommend using a low gear and light steady pedal pressure instead of on-again, off-again braking. Why?
a. Air usage is less with light steady pressure.
b. Brake linings do not heat up as much with light pressure.
c. It works better with a low gear in controlling speed.
d. All of the above.
22. The driver must be able to see a warning before air pressure in the service air tanks falls below ___ psi.
a. 40.
b. 50.
c. 60.
d. 80.
Page 3 answers: (16)b (17)a (18)d (19)b (20)d (21)d (22)c
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