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Delaware CDL Practice Test: Double and Triples - Test 2 2018

(From the 2018 Delaware CDL Handbook)
Number of tests: 2
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 Delaware 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 Delaware DMV locations.

You have made 2 errors so far.
1. The tractor protection valve ______.
  • either 1 or 2

  • yellow

  • white

  • neither 1 nor 2

2. What are hose couplers?
  • Take a cold shower before driving.

  • Stop drinking one-half hour before driving.

  • Drink coffee before driving.

  • Ride home with a friend who has not been drinking.

3. You should check the height of the trailer before connecting a converter dolly to a second or third trailer. The trailer height is right when _____.
  • No u-turn.

  • No left turn.

  • No right turn.

  • No turn on red.

4. When turning wide, keeping the rear of your long vehicle close to the curb will ________.
  • Increase following distance to 5 or 6 seconds

  • Not be concerned about following distance

  • Maintain the 4-second following distance rule

  • Decrease following distance to 2 seconds

5. If you are coupling twin trailers, you should release the dolly brakes by ______.
  • .02%

  • .00%

  • .05%

  • .07%

6. You are testing the stopping action of service brakes on a hydraulic system. Which of the following may indicate that there is a problem with your service brakes?
  • Slippery when wet.

  • Road curves ahead.

  • You are approaching a hill.

  • Don't drink if you are going to drive.