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Maryland CDL Practice Test: Double and Triples - Test 3 2019

(From the 2019 Maryland CDL Handbook)
Number of tests: 3
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. The tractor protection valve ______.
  • neither 1 nor 2

  • white

  • yellow

  • either 1 or 2

2. Usually, a fully charged air system has _______ psi.
  • When the road is wet or slippery

  • On narrow or winding roads

  • At intersections or railroad crossings

  • All of the above

3. The spring brakes come on when the air pressure drops into what range _________.
  • Tell the children to stay away from the driveway.

  • Sound your horn so the children will hear you.

  • Walk to the back of the car to be sure the way is clear.

  • Race your motor to warn the children that you are moving.

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

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

  • Drink coffee before driving.

  • Stop drinking one-half hour before driving.

5. Trailers that do not have spring brakes have emergency brakes, which work from ________.
  • 6-Month

  • 60-Day

  • 1-Year

  • 30-Day

6. The pressure in the service line indicates ______.
  • There is a traffic signal ahead.

  • Continue at your current speed.

  • You must stop ahead.

  • Speeding is not allowed.