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COMBINATION PRACTICE TEST - AZ CDL

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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Arizona 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 Arizona CDL Manual. Take this practice test now to prepare for the actual AZ 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.
50 psi
150 psi
100 psi
2. As part of your vehicle inspection, you are checking that air flows to all trailers. After using the trailer handbrake to provide air to the service line, you go to the rear of the rig. When you open the emergency line shut-off valve at the rear of the last trailer, you should hear:
air escaping from the open valve.
a mechanical vibration.
the service line valve close.
3. Dollies with ABS are required to have a malfunction lamp:
on the right side.
on the rear.
on the left side.
4. Where are shut-off valves?
At the front and back of each trailer.
At the back of each trailer.
At the front of each trailer.
5. The first thing to do when coupling a tractor-semitrailer is to:
check the trailer height.
lock the trailer brakes.
inspect the fifth wheel.
6. A bridge formula permits less maximum axle weight for axles that:
have a high center of gravity
are further apart than normal
are closer together
7. Why should you cover your cargo?
To protect people from spilled cargo.
To protect the cargo from weather.
All of the above.
8. If an aggressive driver is involved in an accident down the road, you should:
confront the aggressive driver.
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.
9. By pushing the trailer air supply control knob in, you:
shut the air off and put on the trailer emergency brakes.
supply the trailer with air.
supply the tires with air.
10. If the ABS is not working:
you still have normal brake functions.
the vehicle will have weak brakes.
the vehicle will have no brakes.
 
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AZ 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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