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Maryland CDL Practice Test: Double and Triples - Test 4 2019

(From the 2019 Maryland CDL Handbook)
Number of tests: 4
Number of questions: 30
Passing score: 80

Directions: To obtain this endorsement for pulling two or three trailers, applicants must pass a 15-question test. And to pass the test, applicants must score at least 80%. Test questions are from the Maryland Commercial Driver Handbook. The Double/Triple trailers endorsement can be used with the Class A CDL. If you need additional information, please contact your local DMV office. You can find your nearest DMV office at Maryland DMV locations.

You have made 2 errors so far.
1. Dollies that have antilock brakes will have what color lamps on the left side of the dolly?
  • An approaching train is not moving fast enough to be a danger.

  • No trains are in sight.

  • At least one-half of your vehicle can cross the tracks.

  • There is room for your vehicle on the other side.

2. If you must stop on a one-way highway, you should place devices _____ ft. toward the approaching traffic.
  • Are travelling through an intersection

  • Are passing a bicyclist

  • See a child who is about to run into the street

  • Are parallel parking

3. Stop light switches are necessary because ________.
  • Flash your high beams

  • Sound your horn

  • Turn on your high beams

  • Turn off your headlights

4. Why should you hang the electrical cable with the plug down when uncoupling?
  • A 3-axle vehicle if the Gross Vehicle Weight is less than 6,000 pounds.

  • A vehicle pulling two trailers.

  • Any 3-axle vehicle regardless of the weight.

5. Coupling devices that connect the emergency and service air lines from the truck to the trailer are _______.
  • Loading zone for passengers or mail only.

  • Loading zone for freight only.

  • Loading zone for freight or passengers.

6. When the air system is low ________.
  • Horn

  • Head lights.

  • Emergency flashers.

  • Parking lights.