ILLINOIS CDL PRACTICE TEST - GENERAL KNOWLEDGE

21. The safety valve installed in the first tank the air compressor pumps air is set to open:
if there is too much pressure.
at 30 psi.
if there is too little pressure.
every 15 minutes.
22. When your rear wheels lock up, you may:
skid, jackknife, or spin the vehicle.
gain better control of the vehicle.
lose steering control.
All of the above.
23. You should schedule trips:
between the hours of 9 a.m. and 10 p.m.
between the hours of 11 a.m. and midnight.
for the hours you are normally awake.
between the hours of 6 a.m. and 6 p.m.
24. When driving in very hot weather, the heat will increase the chances of:
suspension system defects.
ABS malfunction.
loss of hydraulic pressure.
tire failure.
25. When driving through a large puddle or flowing water, you should:
increase engine rpm.
gently put on the brakes.
slow down.
All of the above.
26. The minimum number of mirrors a registered vehicle must have is:
1
4
3
2
27. The size of motorcycles can cause you to misjudge their speed and distance. You should:
check twice for motorcycles before pulling out into traffic.
never share lanes with motorcycles.
use extra caution before you pull out in front of a motorcycle.
All of the above.
28. In coming down steep downgrades, you should:
use a low gear.
go slowly enough so your brakes don't get too hot.
select an appropriate speed.
All of the above.
29. Livestock:
can move around in a trailer and cause unsafe handling.
should always be placed in the rear of the trailer.
should never be carried on a trailer.
should never be kept bunched together.
30. To test your hydraulic brakes for leaks:
turn off the engine and and listen for leaks.
pump the brake pedal three times, then hold it down for five seconds.
apply firm pressure to the brakes for five seconds, then pump them three times.
None of the above.
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