Nevada CDL Air Brakes Practice Test (NV) 2

5 out of 5 (51 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Gearing up to earn your air brakes endorsement in Nevada? Our comprehensive NV DMV air brake test provides an extensive review to boost your preparation for the CDL test. With a focus on essentials such as dual air brake systems, components, operations, safety inspections, and how to calculate stopping distances, this 20-question DMV practice test is designed to thoroughly prepare you for what to expect on the actual test. Achieving a score of at least 16 correct answers is necessary to pass, reflecting the thorough understanding required for safe operation. Given Nevada's unique driving conditions, from the bustling streets of Las Vegas to the expansive desert highways, understanding air brake systems becomes even more crucial. The varied elevations and often extreme temperatures can affect vehicle performance, making it vital to have a solid grasp of how air brakes function under different environmental pressures. This practice permit test serves not just as a study tool but also as a practical guide to mastering driving techniques that are essential in the Silver State. This Nevada CDL air brakes practice test comes equipped with several study aids. If a question proves challenging, hints are available to steer you towards the correct answer. Should you answer incorrectly, a detailed explanation is immediately provided, clarifying why your choice was wrong and the reasoning behind the correct answer. This immediate feedback mechanism is designed to deepen your understanding and help you rectify misconceptions promptly. While this Nevada permit practice test is a robust preparation tool, it is best used in conjunction with a state-certified driver's education or ELDT course. Together, they provide a holistic approach to learning, ensuring you are not only prepared to pass your CDL test but also to drive safely and confidently across Nevada's diverse landscapes.
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Sample Nevada Air Brakes Test Questions

Question 1

What does repeated discharge from an air system's safety relief valve indicate?

  1. A The air system is operating normally
  2. B The reservoir pressure is too low
  3. C The compressor is producing too little air
  4. D An air-system fault requires prompt attention

Correct answer: D – An air-system fault requires prompt attention

The safety valve protects the air tanks and other components from excessive pressure and is usually set to open near 150 psi. Nevada's CDL handbook states that air released through this valve indicates a problem. The fault should be inspected and repaired by a mechanic.

Source: Nevada Commercial Driver License Handbook (DMV 702) — § 5.1.6, “Safety Valve”

Question 2

Which device may be installed in an air brake system to help prevent components from icing in cold weather?

  1. A An air-compressor heater
  2. B A reservoir warming element
  3. C An alcohol evaporator
  4. D A one-way check valve

Correct answer: C – An alcohol evaporator

Some air brake systems use an alcohol evaporator to introduce alcohol into the system. The alcohol reduces the risk of ice forming in valves and other air brake components during cold weather. If the vehicle has this equipment, its container should be checked and filled as necessary.

Source: Nevada Commercial Driver License Handbook (DMV 702) — § 5.1.5, “Alcohol Evaporator”

Question 3

During a sudden emergency stop, what should be your main braking objective?

  1. A Apply the parking brake before using the foot brake
  2. B Keep the vehicle straight while retaining the ability to steer
  3. C Lock every wheel to obtain maximum braking force
  4. D Make large steering movements while braking hard

Correct answer: B – Keep the vehicle straight while retaining the ability to steer

The Nevada handbook emphasizes braking in a way that keeps the vehicle in a straight line and permits steering if needed. With controlled braking, apply the brakes as hard as possible without locking the wheels and keep steering movements small. If the wheels lock, release the brakes long enough for the wheels to roll again.

Source: Nevada Commercial Driver License Handbook (DMV 702) — § 5.4.3, “Emergency Stops”

Question 4

Which procedure checks whether spring brakes apply automatically as air pressure falls?

  1. A With the engine off and wheels secured, release the parking controls and repeatedly apply and release the foot brake
  2. B Keep the engine running, apply the parking brake, and hold down the foot brake
  3. C Drive at least 20 mph and make a hard stop
  4. D At full pressure, repeatedly apply and release only the parking brake

Correct answer: A – With the engine off and wheels secured, release the parking controls and repeatedly apply and release the foot brake

After securing the vehicle and shutting off the engine, fan the foot brake to reduce air pressure. The parking or emergency brake valve should close or pop out between 20 and 45 psi, subject to the vehicle manufacturer's specifications. This indicates that the spring brakes have applied automatically.

Source: Nevada Commercial Driver License Handbook (DMV 702) — § 5.3.3, “Step 7 Final Air Brake Check”

Question 5

What should you do when the low-air-pressure warning activates while driving?

  1. A Stop and safely park as soon as possible
  2. B Shift into a higher gear
  3. C Immediately make a full brake application
  4. D Open the trailer air-supply valve

Correct answer: A – Stop and safely park as soon as possible

A low-air warning may indicate an air leak or another system problem. Stop and safely park while enough reservoir air remains for controlled use of the service brakes. Waiting for the spring brakes to apply can result in a long stopping distance, a skid, or loss of control.

Source: Nevada Commercial Driver License Handbook (DMV 702) — § 5.4.7, “Low Air Pressure”

Question 6

Under good conditions, an air-brake vehicle traveling at 55 mph can normally stop within about 100 feet. True or false?

  1. A TRUE
  2. B FALSE

Correct answer: B – FALSE

The statement is false. Nevada's CDL handbook explains that air brake lag alone adds about 32 feet at 55 mph on dry pavement. For an average driver under good traction and brake conditions, the total stopping distance is more than 450 feet.

Source: Nevada Commercial Driver License Handbook (DMV 702) — § 5.4.4, “Stopping Distance”

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