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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Hawaii CDL combination test consists of 20 questions, and you'll need at least 16 correct answers to pass (80%). The test covers the combination vehicles section of the Hawaii CDL Manual. Take this practice test now to prepare for the actual HI CDL combination test!
1. Before driving a vehicle with a dual air brake system, you should allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
150 psi
50 psi
100 psi
2. When backing a tractor under a trailer, you should:
back at an angle.
always use the lowest reverse gear.
stop before when the kingpin is locked into the fifth wheel.
3. When you drive a tractor-trailer combination with ABS, you should:
apply the trailer hand brake whe braking.
brake as you always have.
pump the brakes.
4. When you make a quick lane change, the crack-the-whip effect can turn the trailer over. The crack-the-whip effect is caused by:
rearward amplification.
the rear trailer of a triple.
strong wind.
5. If loose or missing, _______ may cause movement between the frame and fifth wheel assembly.
electric connectors
locking pins
mounting bolts
6. You supply air to the trailer brake system by:
connecting the tractor service air line to the trailer service glad hand.
plugging the electrical cord into the trailer.
pushing in the trailer air supply knob.
7. A high center of gravity means:
a rollover is less likely.
you'll have better traction.
you are more likely to tip over.
8. Combination vehicles have __ air lines.
9. To prevent rollover, drivers of combination vehicles should:
brake while turning.
keep the cargo as close to the ground as possible.
keep the load is to one side.
10. A burning tire must be:
covered with cloth.
cooled with water.
immediately removed from the vehicle.
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HI Combination Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
Number of questions: 20
Correct answers to pass:16
Passing score:80%
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