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Pennsylvania 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 Commonwealth of Pennsylvania Commercial Driver’s Manual. Questions come from chapter covering: 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
When inspecting a double or triple trailer that has more parts than a smaller tractor-trailer combination:
To save time, not all parts need to be inspected.
A driver should only inspect the first trailer and its parts.
A driver should only inspect the rear trailer and its parts.
A driver should inspect all parts to ensure safety.
What happens when you push in the trailer air supply control knob?
Air is supplied to the emergency lines.
The air system is disconnected from the trailer.
The drain valve is opened.
Air brakes are applied.
In a double or triple combination:
Cargo weight must be evenly distributed between all trailers.
The heaviest trailer should be positioned directly behind the cab.
The heaviest trailer should be positioned in the rear.
The weight of the trailers does not matter.
One way to avoid jackknifing is to:
Swerve frequently.
Exceed the speed limit.
Look ahead of your vehicle to identify potential hazards.
Drive on the shoulder.
While driving, the shut-off valve at the back of the rear trailer should be:
When inspecting the trailers in double and triple combinations:
A driver should walk around the trailers.
A driver should remain in the cab.
A driver should use their mirrors.
A driver should board each trailer.
What happens if, after connecting a trailer, there is no air pressure in the trailer brakes?
The brakes will not work.
There will be no air in the cab.
The load will not be supported properly.
Alternative brakes must be used.
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