COMBINATION TEST IOWA - PRACTICE TEST

11. Empty trucks:
require shorter stopping distances than fully-loaded trucks.
may have poor traction.
have better traction than fully-loaded trucks.
12. If you are driving a 30 foot vehicle at 35 mph, you should leave at least _______ between your vehicle and the vehicle in front of you.
3 seconds
2 seconds
4 seconds
13. To test the service brake:
shift your transmission to a low gear, pump the brake pedal three times, then hold it down for five seconds.
gently try to pull forward with the trailer parking brake on, then release the brake.
push the brake pedal firmly while going about 5 mph.
14. What is the proper following distance for a 50 foot truck traveling at 50 mph?
5 seconds
25 seconds
6 seconds
15. If you get stuck on the railroad tracks, the first thing you should do is:
scream for help.
immediately get out of the cab and move away from the tracks.
stay in your vehicle and call 911.
16. Blocking _______________ to keep it from sliding.
goes from the upper part of the cargo to the floor
is used only in the back of a piece of cargo
is used in the front, back, and/or sides of a piece of cargo
17. An Anti-lock Braking System:
increases the distamce required to stop on slippery surfaces.
increases a vehicle's stopping power.
keeps your wheels from locking when you brake hard.
18. You should use chocks when parking a trailer without spring brakes because:
the brakes will hold only as long as there is air pressure in the trailer air tank.
it helps prevent skids.
it is required by law.
19. Tar in the road pavement rising to the road surface in very hot weather:
is very sticky and will slow down your vehicle.
causes the road to become very slippery.
does not affect the road surface or driving conditions.
20. ABS will:
shorten your stopping distance.
not change your normal braking capability.
increase your average speed.
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