semplr.

Exams · Certifications · Licensing

CDL Doubles/Triples (T) Endorsement Test

Inspecting doubles and triples: practice questions

Our CDL Doubles/Triples bank has 21 questions on this topic. Here are 5 of them with answers; the full mock exam draws from every topic, like the real one.

Start the free mock exam

Question 1

What should you check on the landing gear before driving?

  1. Fully raised, undamaged, with the crank handle in place and secured
  2. Lowered halfway to give the trailer extra support
  3. Resting lightly on the pavement
  4. Crank handle removed and stored
Show the answer

A. Fully raised, undamaged, with the crank handle in place and secured — Landing gear: fully raised, no missing parts, not bent or damaged; crank handle in place and secured (CDL Manual 7.3.1)

Question 2

What should you check about the safety chains on a converter dolly?

  1. They drag on the road for grounding
  2. They are removed for the trip
  3. They are tied to the landing gear
  4. They are secured to the trailer
Show the answer

D. They are secured to the trailer — Safety chains should be secured to trailer(s) (CDL Manual 7.3.1)

Question 3

In a set of doubles, how should the shut-off valves at the rear of the front trailer be set?

  1. Half open
  2. Open
  3. Closed
  4. Removed
Show the answer

B. Open — Shut-off valves at rear of trailers: rear of front trailers OPEN (CDL Manual 7.3.1)

Question 4

In a set of triples, how should the shut-off valves at the rear of the middle trailer be set?

  1. Closed on the service line only
  2. Open
  3. Closed
  4. Open on the emergency line only
Show the answer

B. Open — Shut-off valves: rear of front trailers OPEN, rear of last trailer CLOSED; the middle trailer of triples is a front trailer (CDL Manual 7.3.1)

Question 5

Which inspection procedure does the manual tell you to use for doubles and triples?

  1. The seven-step procedure from Section 2
  2. The school bus post-trip check
  3. A three-step tire check
  4. Only a walk past the lights
Show the answer

A. The seven-step procedure from Section 2 — Use the seven-step inspection procedure described in Section 2 to inspect your combination vehicle (CDL Manual 7.3)

More CDL Doubles/Triples topics