CDL General Knowledge Practice Test 2026: Test de práctica 2

Test de práctica 2 de 6 de CDL General Knowledge Practice Test: 25 preguntas más con respuestas y explicaciones.

Vehículo comercial
Estados Unidos
150 preguntas
Revisado el 10 de octubre de 2026

Pregunta 1 de 25
For a first Class A or Class B CDL, when must entry-level driver training be finished?
- Before your first renewal
- Before you take the CDL skills test
- Within one year after you get your CDL
- Before you take the knowledge test
Ver respuesta
Respuesta: B. Before you take the CDL skills test
ELDT must be completed before the skills test for a first Class A or Class B CDL.
Pregunta 2 de 25
A Class B CDL holder wants to upgrade to Class A. Is entry-level driver training needed?
- Yes
- No, a Class B holder is exempt
- Only if they will haul hazmat
- Only if they are under 21
Ver respuesta
Respuesta: A. Yes
Upgrading from Class B to Class A is one of the cases that requires ELDT.
Pregunta 3 de 25
Under federal rules, how old must you be to drive a commercial motor vehicle in interstate commerce?
- 18
- 21
- 19
- 25
Ver respuesta
Respuesta: B. 21
A driver must be at least 21 years old to drive a CMV in interstate commerce.
Pregunta 4 de 25
Who may do your DOT medical exam?
- A medical examiner on FMCSA's National Registry
- Your company's safety manager or dispatcher
- Any licensed nurse at a walk-in clinic
- A pharmacist who checks your medicines
Ver respuesta
Respuesta: A. A medical examiner on FMCSA's National Registry
The physical exam must be done by a medical examiner on the National Registry of Certified Medical Examiners.
Pregunta 5 de 25
How often must most CDL drivers pass a DOT medical exam?
- Every 6 months
- Every 5 years
- Only once, before the first CDL
- At least every 24 months
Ver respuesta
Respuesta: D. At least every 24 months
Most drivers must be re-examined if they have not been certified in the last 24 months. Some conditions need a new exam every 12 months.
Pregunta 6 de 25
What distant vision does a CMV driver need in each eye, with or without glasses?
- At least 20/20
- At least 20/100
- At least 20/40
- At least 20/60
Ver respuesta
Respuesta: C. At least 20/40
The vision standard is at least 20/40 in each eye, with or without corrective lenses.
Pregunta 7 de 25
What field of vision must a CMV driver have in each eye?
- At least 70 degrees side to side
- At least 120 degrees side to side
- At least 30 degrees side to side
- At least 45 degrees side to side
Ver respuesta
Respuesta: A. At least 70 degrees side to side
Drivers need a field of vision of at least 70 degrees in the horizontal meridian in each eye.
Pregunta 8 de 25
How well must a commercial driver read and speak English?
- English is not required for drivers who cross state lines
- Well enough to talk with the public, read signs and fill out reports
- Well enough to pass a college-level English writing class
- Only well enough to read the CDL manual before the test
Ver respuesta
Respuesta: B. Well enough to talk with the public, read signs and fill out reports
Federal rules require enough English to converse with the public, understand traffic signs, respond to official questions and make report entries.
Pregunta 9 de 25
You are convicted of a traffic violation (not parking) in any vehicle. How soon must you tell your employer?
- Within 1 year
- Only if it happened in a CMV
- At your next license renewal
- Within 30 days
Ver respuesta
Respuesta: D. Within 30 days
Commercial drivers must notify their employer within 30 days of a traffic conviction, other than parking, in any type of vehicle.
Pregunta 10 de 25
When you apply for a commercial driving job, how many years of past employment must you list?
- 2 years
- 20 years
- 5 years
- 10 years
Ver respuesta
Respuesta: D. 10 years
You must give your employer information about all driving jobs you held in the past 10 years.
Pregunta 11 de 25
How many driver's licenses may a commercial driver hold?
- As many as you need
- Two: one CDL and one regular license
- One for each state you drive in
- Only one
Ver respuesta
Respuesta: D. Only one
You may hold only one license. Having more than one can bring a fine or jail.
Pregunta 12 de 25
What alcohol concentration is the legal limit for driving a commercial motor vehicle?
- 0.08%
- 0.10%
- 0.02%
- 0.04%
Ver respuesta
Respuesta: D. 0.04%
Driving a CMV with an alcohol concentration of 0.04% or more is a disqualifying offense.
Pregunta 13 de 25
How long before going on duty or driving a CMV must you stop using alcohol?
- At least 1 hour
- At least 24 hours
- At least 4 hours
- At least 8 hours
Ver respuesta
Respuesta: C. At least 4 hours
You may not use alcohol within 4 hours before going on duty or driving a CMV.
Pregunta 14 de 25
You are found with any detectable alcohol while on duty, but under 0.04%. What happens?
- Nothing, because you are under the limit
- You lose your CDL for life
- You get a warning only
- You are put out of service for 24 hours
Ver respuesta
Respuesta: D. You are put out of service for 24 hours
A driver with any measured alcohol or detected presence of alcohol is placed out of service for 24 hours.
Pregunta 15 de 25
A driver is convicted for the first time of driving a CMV under the influence. The load was not hazmat. What is the disqualification?
- At least 60 days
- At least 3 years
- For life
- At least 1 year
Ver respuesta
Respuesta: D. At least 1 year
A first conviction for a major offense such as DUI brings a disqualification of 1 year when no hazmat is involved.
Pregunta 16 de 25
What is the disqualification for a first DUI conviction while hauling placarded hazardous materials?
- At least 3 years
- At least 120 days
- At least 6 months
- At least 1 year
Ver respuesta
Respuesta: A. At least 3 years
First convictions for major offenses while transporting hazardous materials carry a 3-year disqualification.
Pregunta 17 de 25
What is the usual penalty for a second conviction of a major offense, such as DUI, in a CMV?
- A fine only
- Disqualification for life
- Disqualification for 1 year
- Disqualification for 120 days
Ver respuesta
Respuesta: B. Disqualification for life
A second conviction for a major offense generally brings a lifetime disqualification.
Pregunta 18 de 25
While driving a CMV, you refuse a police officer's request to take an alcohol test. How is this treated?
- As a major offense, like DUI
- As a minor warning
- As a parking violation
- It has no effect on your CDL
Ver respuesta
Respuesta: A. As a major offense, like DUI
Refusing an alcohol test is a major offense, with the same 1-year first-time disqualification as DUI.
Pregunta 19 de 25
You are convicted of two serious traffic violations in a CMV within 3 years. How long is the disqualification?
- At least 30 days
- At least 1 year
- At least 60 days
- At least 120 days
Ver respuesta
Respuesta: C. At least 60 days
A second serious traffic violation within 3 years brings a 60-day disqualification.
Pregunta 20 de 25
What happens after a third serious traffic violation in a CMV within 3 years?
- At least a 120-day disqualification
- A lifetime disqualification
- At least a 60-day disqualification
- A warning letter
Ver respuesta
Respuesta: A. At least a 120-day disqualification
Three or more serious traffic violations within 3 years bring a 120-day disqualification.
Pregunta 21 de 25
Which of these is a serious traffic violation for a CDL holder?
- An expired registration sticker
- A parking ticket
- Driving 5 mph over the limit
- Speeding 15 mph or more over the limit
Ver respuesta
Respuesta: D. Speeding 15 mph or more over the limit
Excessive speeding of 15 mph or more over the limit is listed as a serious traffic violation.
Pregunta 22 de 25
How are texting and using a hand-held phone while driving a CMV treated?
- They are allowed if you hold the phone below the window
- They are allowed at speeds under 25 mph
- As minor offenses with no effect on the CDL
- As serious traffic violations that can lead to disqualification
Ver respuesta
Respuesta: D. As serious traffic violations that can lead to disqualification
Texting and using a hand-held mobile phone while driving a CMV are both serious traffic violations.
Pregunta 23 de 25
When may you use a hand-held phone while driving a CMV?
- When you are stopped at a red light
- When your dispatcher needs to reach you
- Only to call police or emergency services
- When traffic is light on the highway
Ver respuesta
Respuesta: C. Only to call police or emergency services
Federal rules ban hand-held phone use while driving a CMV, except to contact law enforcement or emergency services.
Pregunta 24 de 25
You are convicted of a railroad crossing violation in a CMV for the first time. What is the disqualification?
- At least 60 days
- At least 10 days
- At least 1 year
- For life
Ver respuesta
Respuesta: A. At least 60 days
A first railroad-highway grade crossing violation brings a disqualification of no less than 60 days.
Pregunta 25 de 25
What is the disqualification for a first conviction of driving while under an out-of-service order (no hazmat or passengers)?
- For life
- 2 to 5 years
- 180 days to 1 year
- 30 to 60 days
Ver respuesta
Respuesta: C. 180 days to 1 year
A first out-of-service order violation brings a disqualification of no less than 180 days and no more than 1 year.

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