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District of Columbia · DCChange state

Free District of Columbia CDL practice test 2026

The tests that apply in District of Columbia, drawn from the shared bank plus the questions written specifically for the District of Columbia manual.

Tests that apply in District of Columbia

General KnowledgeRequired for every CDL applicant, whatever class or endorsement you are after.
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Air BrakesThe section applicants fail most often. Pressure figures differ by state manual.
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Combination VehiclesNeeded for Class A tractor-trailer, including coupling and uncoupling order.
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Pre-Trip InspectionWhat the examiner expects you to point at and say out loud, in order.
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Hazardous MaterialsH endorsement: placarding, shipping papers and the segregation table.
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Doubles & TriplesT endorsement: coupling order, converter dollies and trailer sway.
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Tank VehiclesN endorsement: surge, baffles and the rules for outage.
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Passenger TransportP endorsement: loading, standee lines and emergency exits.
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School BusS endorsement: danger zones, loading and unloading, railroad crossings.
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A sample question

One example, answer shown. Practising the rest happens in the app.

At approximately what pressure does the air compressor governor stop pumping air into the tanks?

  1. 125 psi
  2. 150 psi
  3. 100 psi
  4. 60 psi

The governor 'cut-out' pressure is about 125 psi. When tank pressure falls to roughly 100 psi, the governor cuts back in and the compressor resumes pumping.

Handbook section 5.1.2
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