How Many Questions Are on the Oregon CDL General Knowledge Test?
50 questions. That count is fixed by 49 CFR Part 383, the same across every state — Oregon DMV administers the federal format rather than writing its own.
What Oregon actually controls
The federal government owns the question count and 80% threshold. Oregon's own contribution is a $40 CLP application fee plus a separate $10 charge for each written test attempt.
Depending on the class and endorsements pursued, additional tests — like Air Brakes or Combination Vehicles — may also apply on top of the General Knowledge test, each carrying its own $10 fee.
A skills test given by someone other than DMV
Oregon DMV staff administer the written knowledge tests, but the skills test itself is scheduled with a Third Party CDL Tester, not a DMV examiner directly.
Knowledge test results stay valid for 6 months; if the CLP application isn't completed within that window, the tests have to be retaken.
How our practice tests are structured
Our practice tests break results down by topic immediately, so a weak spot doesn't stay hidden inside an otherwise decent overall score.
Each question includes an explanation and a source reference, so you learn why an answer is correct instead of just memorizing a letter.
Frequently Asked Questions
How many questions are on Oregon's CDL General Knowledge test?
50 questions, the federally standard length used nationwide, not an Oregon-specific number.
What does the Oregon CLP process cost?
A $40 application fee, plus $10 for each written test attempt.
Who gives the CDL skills test in Oregon?
A Third Party CDL Tester, not DMV staff directly — a separate arrangement from the DMV-administered knowledge test.
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Start a free Oregon cdl practice testLast reviewed: 2026-07-22