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CDL DOUBLES TRIPLES PRACTICE TEST IDAHO

11. When backing, it is best to:
use a helper whenever possible.
use only the passenger's side mirror.
try to back in the direction of the drift.
12. In a dual air brake system, if one air system is very low on pressure:
either the front or rear brakes will not be operating fully.
you should drive and brake as you always have.
you should pump the brakes to restore pressure.
13. Before connecting the converter dolly to the rear trailer, make sure that:
the trailer height is slightly lower than the center of the fifth-wheel.
the kingpin rests on the fifth-wheel.
the shut-off valves at the rear of the first trailer are open.
14. Headache racks:
protect you from being hit by your cargo.
can blind other drivers.
help you keep weights within legal limits.
15. Large vehicles take longer to stop when they are:
fully loaded.
heavily loaded but not fully loaded.
empty.
16. Your vehicle should be equipped with all of the following except:
Spare electrical fuses
Warning devices for parked vehicles
Instructions on how to perform a vehicle inspection test
17. If your brakes fail on a steep mountain downgrade, you should:
slow down until your vehicle comes to a complete stop.
decide what to do as soon as you know your brakes do not work.
stay on the road and keep looking for the next available escape ramp.
18. When you double your speed, the braking distance is:
3 times longer.
the same.
4 times longer.
19. You should flash your brake lights to warn drivers behind you when:
you see a hazard that will require slowing down.
you see a bus stops in the roadway ahead to unload passengers.
All of the above.
20. If you must stop on a one-way or divided highway, place your warning devices:
10 feet, 100 feet, and 200 feet toward the approaching traffic.
100 feet, 200 feet, and 300 feet toward the approaching traffic.
10 feet, 50 feet, and 150 feet toward the approaching traffic.
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