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CDL : Commercial Drivers License 2025 Exam

Certification-Board CDL Questions & Answers

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Commercial Drivers License 2025


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Question: 969


What is the key requirement for a commercial vehicle operator when transporting hazardous materials?


  1. The driver must have a specific endorsement on their CDL

    vehicle must be painted in bright colors for visibility driver must complete an online safety course


    er: A


    nation: Drivers transporting hazardous materials must have a specific endorsement on their C ing their training and knowledge regarding the safe handling and transportation of such mate


    ion: 970

    riving through a construction zone, you encounter a flagger signaling you to stop. What sh o?


    your vehicle and wait for further instructions ore the flagger and continue driving

    ed past the flagger to avoid delays

    ly stop if other vehicles are also stopping er: A

    nation: Stopping your vehicle and waiting for further instructions from the flagger is crucial for nd compliance with traffic regulations in construction zones.


    ion: 971


    ritical action should a driver take before making a left turn in a commercial vehicle to ensur

    The vehicle must be equipped with a GPS tracking system

  2. The

  3. The Answ

Expla DL,

reflect rials.


Quest

While d ould

you d


  1. Stop

  2. Ign

  3. Spe

  4. On

Answ Expla

safety a


Quest


What c e

compliance with safety regulations related to the use of air brakes?


  1. Ensure that the brake-door interlock is functioning properly

  2. Check for pedestrians and cyclists, then make the turn

  3. Engage the air brake system to slow down before turning

  4. Signal the turn and accelerate through the intersection Answer: A

Explanation: Before making a turn, it is crucial to ensure that the brake-door interlock is functioning

properly. This prevents movement while doors are open and ensures safety during the maneuver.


Question: 972


During a pre-trip inspection, how should a driver assess the functionality of the vehicle’s lights, including headlights, taillights, and turn signals?


  1. By visually inspecting them without any testing

  2. By checking the bulb packaging for expiration dates

    driving at night to test their effectiveness er: C

    nation: Activating each light type and having a second person observe ensures that all lights on correctly and enhances safety on the road.


    ion: 973


    of the following describes the consequences of a commercial driver failing to adhere to the vice regulations?


    driver will receive a financial bonus.

    driver may face civil penalties and potential disqualification from operating a commercial v ere are no consequences if the driver is not involved in an accident.

    driver can continue to operate as long as they notify their employer. er: B

    nation: Failing to adhere to hours of service regulations can lead to civil penalties and potent lification from operating a commercial vehicle, regardless of accident involvement.


    ion: 974


    oes the presence of contaminants in the air supply affect the air brake system, particularly in

    By activating each light type and ensuring they operate correctly while a second person observes

  3. By

Answ Expla

functi


Quest


Which hours

of ser


  1. The

  2. The ehicle.

  3. Th

  4. The Answ

Expla ial

disqua


Quest


How d terms

of maintenance requirements?


  1. It reduces the need for regular maintenance

  2. It can lead to increased wear and tear, requiring more frequent maintenance

  3. It has no impact on maintenance requirements

  4. It enhances the overall efficiency of the system Answer: B

Explanation: The presence of contaminants in the air supply can lead to increased wear and tear on the

braking components, necessitating more frequent maintenance to ensure optimal performance and safety.


Question: 975


When assessing the condition of the vehicle’s lights, what specific aspect should a driver pay attention to regarding the functionality of the turn signals?


  1. The brightness of the lights compared to the headlights

  2. The speed of the flashing and whether both sides are operational

  3. The color of the lenses only


    er: B


    nation: The speed of the flashing and whether both sides are operational are critical checks fo ensuring they function correctly to communicate intentions to other drivers.


    ion: 976


    re approaching a sharp curve on a mountainous road with a loaded truck. To navigate the cur what should you do?


    celerate slightly to maintain momentum through the curve ply brakes heavily before entering the curve

    the horn to alert other drivers

    wnshift and slow down before the curve er: D

    nation: Downshifting and slowing down before entering the curve gives you better control an the risk of tipping over due to centrifugal force.


    ion: 977


    hould a commercial driver do if they feel fatigued while driving, especially on long-haul tri

    The angle at which they are mounted Answ

Expla r turn

signals,


Quest


You a ve

safely,


  1. Ac

  2. Ap

  3. Use

  4. Do


Answ


Expla d

reduces


Quest


What s ps?


  1. Push through the fatigue to reach the destination faster

  2. Find a safe place to stop and take a break

  3. Use caffeinated drinks to stay awake

  4. Turn on loud music to stay alert Answer: B

Explanation: It is crucial for drivers to find a safe place to stop and take a break if they feel fatigued, as driving while drowsy can significantly impair judgment and reaction times.

Question: 978

In the event of an air brake system failure, what is the recommended emergency procedure for a driver operating a combination vehicle to bring it to a safe stop?


  1. Gradually apply the service brakes

  2. Shift to a lower gear and coast to a stop

  3. Activate the hazard lights and continue driving

  4. Engage the emergency brakes and steer to a safe area Answer: D

nation: Engaging the emergency brakes and steering to a safe area is the recommended proce ent of air brake system failure. This action helps to slow the vehicle down safely and avoid ial hazards.


ion: 979


the loading of a tank vehicle, what is the most effective method to ensure that no hazardou escape into the atmosphere?


ling all connections and ensuring proper venting systems are in place ng open vents to allow airflow

ading the cargo quickly to minimize exposure time oring vapor management as it’s not a concern


er: A


nation: Sealing connections and ensuring proper venting are critical measures to prevent haza from escaping during loading, protecting both health and the environment.


ion: 980


ontext of the Commercial Driver License (CDL) testing process, what is the purpose of the


valuate the driver’s knowledge of traffic laws

Expla dure in

the ev potent


Quest


During s

vapors


  1. Sea

  2. Usi

  3. Lo

  4. Ign Answ

Expla rdous

vapors


Quest


In the c skills

test?


  1. To e

  2. To determine the driver’s physical fitness for driving

  3. To assess the driver’s ability to operate a vehicle safely in real-world conditions

  4. To measure the driver’s experience with various vehicle types Answer: C

Explanation: The skills test is designed to assess a driver’s ability to operate a vehicle safely in real- world conditions, ensuring they can handle the vehicle's controls and respond to various driving scenarios effectively.

Question: 981


What should a driver do if they notice a low oil pressure reading during an internal inspection?


  1. Continue driving until the next scheduled service

  2. Only check the oil level if the engine fails to start

  3. Ignore it if the engine sounds normal


    nation: A low oil pressure reading is a warning sign. The driver should check for leaks and a essary to prevent engine damage.


    ion: 982

    djusting the brake pushrod travel in a combination vehicle, what is the maximum allowable ce for the pushrod to ensure optimal brake performance?


    nch nches nches nches


    er: C


    nation: The maximum allowable travel distance for the brake pushrod is typically 2 inches. ding this distance can indicate that the brakes need adjustment or maintenance, which is cruc

    performance.


    ion: 983


    otice that your load is shifting during transit, what is the safest immediate course of action take?


    rease your speed to stabilize the load

    Check for leaks and top up the oil as necessary Answer: D

Expla dd oil

as nec


Quest

When a travel

distan


  1. 1 i

  2. 3 i

  3. 2 i

  4. 4 i

Answ Expla

Excee ial for

optimal


Quest


If you n you

should


  1. Inc

  2. Call for roadside assistance without stopping

  3. Ignore it if the vehicle feels stable

  4. Pull over to a safe area and adjust the load Answer: D

Explanation: Pulling over to a safe area to adjust the load is essential. Continuing to drive with a shifting load can lead to loss of control and potential accidents.


Question: 984

You’re driving a commercial vehicle during extreme heat, and the temperature gauge is rising. What proactive measures should you take to prevent overheating?


  1. Increase your speed to improve airflow

  2. Check coolant levels and ensure fans are working

  3. Turn off the air conditioning and drive slowly

  4. Ignore the gauge if the engine sounds normal Answer: B

ining the engine’s temperature within safe limits.


ion: 985


enario where you encounter a sudden obstacle on the road, what defensive driving technique you prioritize to avoid a collision?


nk your horn aggressively

er around the obstacle, if safe to do so mediately apply the brakes hard celerate to pass the obstacle quickly


er: B


nation: The best defensive driving technique is to steer around the obstacle safely while main of the vehicle, rather than making sudden movements.

Explanation: Checking coolant levels and ensuring fans are working helps prevent overheating by mainta


Quest


In a sc should


  1. Ho

  2. Ste

  3. Im

  4. Ac


Answ


Expla taining

control


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