CDL COMBINATION PRACTICE TEST OKLAHOMA

11. Radial and bias-ply tires:
should be used together only when driving in packed snow.
should not be used together.
should be used together.
12. If a trailer does not have spring brakes, to keep the trailer from moving you should:
park on a slight decline.
use the service brakes.
use wheel chocks.
13. By pushing the trailer air supply control knob in, you:
supply the tires with air.
supply the trailer with air.
shut the air off and put on the trailer emergency brakes.
14. If you smell exhaust fumes in the cab, you should:
remember to conduct a post-trip inspection.
open the windows.
stop immediately.
15. When inspecting the cargo, make sure it is:
secured properly for the first 50 miles after beginning a trip.
not overloaded.
piled up.
16. If you will be transporting hazardous materials that require placards, you must:
obtain a special transit permit.
transport the materials at night only.
obtain a hazardous materials endorsement.
17. When backing a trailer, you should:
avoid correcting the drift.
try to position your vehicle so you can back in a straight line.
turn the steering wheel in the direction you want to go.
18. If you unlock the pintle hook with the dolly still under the rear trailer:
your vehicle might roll away.
the dolly tow bar may fly up.
the brakes could be damaged by the combined forces of the springs and the air pressure.
19. If an aggressive driver is involved in an accident down the road, you should:
try to get their vehicle to the side of the road.
stop a safe distance from the accident scene, wait for the police and report the behavior you witnessed.
confront the aggressive driver.
20. Broken suspension parts can be very dangerous. When inspecting your vehicle for suspension system defects, look for:
Broken leaves in a multi-leaf spring.
Spring hangers that allow movement of axle from proper position.
All of the above.
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