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Illinois CDL Permit Test - Double

Number of questions: 20
Passing score: 16
Directions: This endorsement is required if the driver will pull two or three trailers. To receive this endorsement, applicants must pass a test. The test consists of 20 multiple choice questions. To pass, the applicant must answer at least 16 questions correctly. Test questions come from the Illinois Commercial Driver’s License Study Guide. Questions come from chapters covering: Driving Safely, Air Brakes (if applicable), Combination Vehicles and Doubles and Triples. The Double/Triple endorsement can be used with the Class A CDL.
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Passing grade —
4 or fewer errors
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1.
The minimum size of placards identifying hazardous materials is:
Four inches.
Six and one-quarter inches.
Nine and three-quarter inches.
10 and three-quarter inches.
2.
In a vehicle with dual air brakes, what happens if one system is low on pressure?
The air from the other system will be used to supplement the system with the low pressure.
The front or rear brakes may not work properly.
All brakes will be inoperable.
The low system will use an auxiliary system to fill the tank.
3.
A low air pressure warning signal should activate:
When tank pressure falls below 120 psi.
When tank pressure falls below 60 psi.
When tank pressure falls below 10 psi.
When tank pressure falls below 5 psi.
4.
Operating a combination vehicle usually requires ­­­­­____ operating a single vehicle.
Less skill than
About the same level of skill as
More skill than
Exactly the same level of skill as
5.
A cargo van carrying a light load is usually:
The same height as when carrying a heavy load.
Taller than when carrying a heavy load.
Shorter than when carrying a heavy load.
Less stable than when carrying a heavier load.
6.
A vehicle inspection is required:
For insurance purposes.
To get fuel.
By state and federal law.
7.
Off-ramps:
Are usually safe for trucks.
Can be dangerous for trucks.
Should not be used by trucks.
Should be used only if following another vehicle.
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