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CDL Practice Test
General Knowledge
Air Brakes
Combination Vehicles
Doubles and Triples
Tanker Vehicles
Hazardous Materials
Transporting Passengers
CDL Combination Vehicles Practice Test
Question 1 of 3
After hooking the trailer to the tractor you should check the fifth wheel connection by:
A
Backing the tractor slowly with the trailer brakes locked
B
Pulling the tractor ahead slowly with the trailer brakes locked
C
Backing the tractor quickly with the trailer brakes unlocked
D
Pulling the tractor ahead quickly with the trailer brakes unlocked
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