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Maryland 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. Each question has three or four possible answer choices. Test questions come from the Maryland Commercial Driver 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.
You have made error so far
Passing grade —
4 or fewer errors

Front brake limiting valves were intended to:

Prevent the front tires from skidding.
Prevent the front tires from overheating.
Create equal brake usage.
Remove uncertainty when applying the brakes.

The trailer hand valve should be used:

To test the trailer brakes.
To check the connection between the trailer and tractor.
To accelerate.
To test the lights on the trailer.

The "crack-the-whip" effect is caused by:

Rearward amplification.
Driving below the speed limit.
Heavy traffic.

If a driver has stopped on the road and is placing triangles to warn other motorists:

The triangles should be held between the driver and oncoming traffic.
The triangles should be carried behind the driver's back to prevent them from being seen by other drivers until they are placed.
The triangles should be held as low as possible.

If a vehicle is found to be over-length during a pre-trip inspection, the driver should:

Trim the length of the load.
Ask someone else to drive.
Ensure flags and lights indicating the oversize load are fastened securely.
Drive without making any changes.

On trucks and buses, where are ABS malfunction lamps located?

On the driver’s door
On the instrument panel
On the outside of the vehicle by the passenger’s door
Under the hood

Which of the following is not a type of retarder?

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