DOUBLES TRIPLES TEST MS - CDL PRACTICE TEST

11. The trolley valve should be used only:
to test the trailer brakes.
to prevent skids.
in driving.
in an emergency.
12. If you become drowsy while driving, you should:
open the windows to get some fresh air.
try to fight it.
take a break.
drink plenty of coffee.
13. Because of the "crack-the-whip" effect, doubles and triples:
are more likely to turn over than other combination vehicles.
can go much faster than other combination vehicles.
are much slower than other combination vehicles.
are more likely to run out of gas than other combination vehicles.
14. If you are feeling sleepy, you should:
slow down and drive on the shoulder of the road.
increase your speed to get to the destination quicker.
pull off the road and rest or take a nap.
None of the above.
15. When you turn suddenly, which trailer is most likely to turn over?
The rear trailer of doubles
The front trailer
The last trailer of triples
None of the above.
16. Emergency lines are often coded with the color ___ to keep from getting them mixed up with the service line.
red.
white.
yellow.
blue.
17. The earliest way to recognize that your trailer has started to skid is:
by checking the jackknife sensor.
by hearing squeaking noises from the wheels.
by checking your mirrors.
by releasing the brakes.
18. The heavier the vehicle:
the more work the brakes must do to stop it.
the higher the center of gravity will be.
the less work the brakes must do to stop it.
None of the above.
19. What factors can cause brakes to fade?
Slippery surfaces and shaded areas.
Dirt roads and in unpaved yards.
Gravel and tar.
Excessive heat and brakes out of adjustment.
20. You are more at risk of being fatigued:
when driving alone.
when driving during the day.
after getting more than 8 hours of sleep.
when stopping periodically during long trips.
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