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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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8.
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.
9.
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.
10.
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.
11.
Due to the "crack-the-whip" effect:
Doubles and triples are more likely to turn over than other combination vehicles.
A combination vehicle will make a loud noise if driven fast enough.
The tires on a middle trailer will lock up at all stops.
Vehicles following a truck will be able to travel faster than normal.
12.
Doubles:
Are easier to drive than singles.
Are less likely to roll over than singles.
Are less likely to jackknife than singles.
Require a longer reaction time than singles.
13.
When parking a double or triple, you should:
Choose a spot that allows you to back up when exiting.
Choose a spot that allows you to pull forward when exiting.
Not be concerned with the location.
Choose a parking lot with a lot of tight corners.
14.
In poor weather, the driver of a double or triple should:
Lead the way for other drivers.
Drive on the shoulder of the road.
Exceed the posted speed limit.
Drive carefully, as the vehicle is prone to skidding.
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