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22 multiple-choice questions and 27 flashcards on ELDT, Licensing and Medical, about 7% of the CDL Class A bank. Every one carries a written rationale.
ELDT, Licensing and Medical is one of 12 chapters in CoStudy's CDL Class A (General Knowledge) bank, and it holds 22 of the bank's 300 multiple-choice questions — roughly 7% of the total. That proportion is not arbitrary: chapters follow the certifying body's published exam outline, and the number of questions in each is set by that domain's published weight, so the share of your practice time this chapter takes matches the share of the real exam it accounts for.
Studying by chapter is worth doing once you have a diagnostic score. A single overall percentage tells you whether you are close; it does not tell you which domain is dragging. Working a weak chapter in isolation, and re-testing it in isolation, is the fastest way to move a score that has stalled — and it is why the mock exams in CoStudy report by domain rather than as one number.
10 questions drawn from this chapter, with the full rationale shown — the controlling principle behind the right answer, and why each wrong option tempts and fails.
ELD (Electronic Logging Device) is:
Answer: C — Mandatory for most CMV drivers to record hours of service
A) Unrelated. C) Correct — ELDs replaced paper logbooks; required for most CMVs since Dec 2017. B) No, mandatory. D) Different device.
A driver tests positive on a required drug test. What follows under the Clearinghouse rules?
Answer: A — Prohibited status barring driving
A) Right — the violation is reported to the Clearinghouse and the driver is prohibited from safety-sensitive functions until the return-to-duty process is completed. B) The medical certificate is a separate qualification document. C) The entry is far more than a warning. D) A lifetime bar is not the ordinary outcome of a first violation.
An applicant seeking a first Class A CDL has finished training at a private school. What must also be true under 49 CFR Part 380 Subpart F?
Answer: A — The school must be on the FMCSA Registry
A) Right — Entry-Level Driver Training must come from a provider listed on the FMCSA Training Provider Registry. B) State educational accreditation is not the federal test. C) No federal minimum hour or duration count is set by the rule. D) Who pays is irrelevant to compliance.
Post-accident drug/alcohol testing under FMCSA is required when:
Answer: C — A fatality occurs, OR a citation is issued plus injury/tow occurs
A) Not every accident triggers testing. C) Correct — fatality alone, OR citation + injury (requiring medical attention) or tow-away, triggers testing. C/D) Not the rule.
Drugs and alcohol affect driving by:
Answer: D — Reducing reaction time, impairing judgment, and decreasing coordination
A) Direction reversal trap. D) Correct — all major faculties needed for driving are impaired. C/B) Misconceptions.
A medical card (DOT MCSA-5876) for CDL drivers is typically valid for:
Answer: C — Up to 24 months
A) Too short. B) Possible if conditions warrant. C) Correct — up to 24 months for healthy drivers; shorter if monitored conditions. D) Too long.
What is the CDL BAC limit while driving a commercial motor vehicle?
Answer: C — 0.04%
A) Stricter than required. C) Correct — 0.04% is the federal CMV limit, half of the 0.08% non-commercial limit. B) Non-CMV limit. D) Pre-1990s limit, no longer applicable.
Class A CDL covers:
Answer: A — Any combination ≥26,001 lbs with trailer ≥10,001 lbs
B) That's Class B. A) Correct — Class A is for combination vehicles with a tractor and trailer over the weight thresholds. C) Class B or C depending on weight. D) Hazmat is an endorsement, not a class.
A driver operates a single vehicle over the heavy threshold towing a small trailer under 10,000 pounds. Which class fits BEST?
Answer: B — Class B, heavy truck with a light trailer
B) Right — Class B covers a heavy single vehicle towing a trailer not over 10,000 pounds. A) Class A applies when the towed unit is over 10,000 pounds and the combination is heavy. C) Class C covers smaller vehicles carrying passengers or placardable hazmat. D) The power unit's own weight still requires a CDL.
An applicant tests in a vehicle with hydraulic brakes. What appears on the license?
Answer: B — An air brake restriction is placed on it
B) Right — testing without air brakes results in an air brake restriction barring operation of air-braked commercial vehicles. A) Tank endorsements are earned by separate knowledge testing, not withheld by brake type. C) Passenger endorsements are unrelated to brake systems. D) The transmission restriction comes from testing in an automatic, a different issue.
4 cards from the 27 in this chapter.
CDL DUI blood alcohol limit?
0.04% (half of non-commercial 0.08%). Conviction = 1-year disqualification.
H endorsement?
Hazmat transport.
Maximum driving hours per day (property carrier)?
11 hours after 10 consecutive hours off duty.
X endorsement?
Combination of Hazmat + Tank (Class 3 or other).
These are a sample. The full ELDT, Licensing and Medical chapter runs 49 items with per-chapter progress tracking, on the web and in the iOS app.