New Jersey CDL DMV Knowledge Test Class A 1

On a downgrade, you should use the braking effect of your engine as the principal way of controlling your speed. Save your brakes for additional slowing or stopping that may be required by road or traffic conditions.

On flatbed trailers and trailers without sides, cargo must be tied down. There should be at least one tie-down for every 10 feet of cargo. Regardless of the size of the cargo, at least two tie-downs must be used.

Sending and reading text messages while driving is prohibited.

It is important to know the maximum air loss rate that is safe for your specific vehicle. A single vehicle with air brakes should have a leakage rate no higher than 3 psi in a minute during an applied leakage test.

The weight of cargo in a trailer should be evenly balanced. Having too much or too little weight on an axle can interfere with proper control of the vehicle. Additionally, having too much weight on one axle can damage it.

During the vehicle inspection test, you must be able to indicate where the oil dipstick is located; show that the oil level is within a safe operating range; and show that the oil level is above the refill mark.

On a vehicle with air brakes, pressing and releasing the brake pedal unnecessarily may let air out of the braking system faster than the compressor can replace it. This may cause the system's air pressure to become too low and the brakes to stop working.

Spring brakes come on automatically when air pressure drops to an unsafe psi level. Instead of waiting for the spring brakes to automatically activate, you should safely exit the road as soon as you notice the low pressure warning signal and bring your vehicle to a stop while you are still able to control the brakes.

If a trailer is attached to a tractor, the adjustment of the vehicle's mirrors can only be checked accurately if the trailer is straight.

Pre-trip inspections should be conducted in the same way every time. This will reinforce the steps, making it less likely that you will forget to inspect something important.

When a brake pedal is pressed and the S-cam is turned, the S-cam presses the brake shoes against the inside of the brake drum. This causes friction and will cause the vehicle to slow.

When inspecting an exhaust system, you should verify that parts of the system are not loose, broken, or missing. The system's parts must be properly mounted and should not be rubbing against moving parts of the vehicle.

The most important reason to inspect your vehicle before a trip is to ensure the safety of yourself and others on the road. Safety inspections before every trip are required by state and federal laws.

The parking brake in a vehicle with air brakes should be used every time the vehicle is parked.

B and C type fire extinguishers are designed to work on electrical fires. Water should never be used to extinguish an electrical fire because doing so could result in an electrical shock.

To travel safely, it is essential that you know what is happening on all sides of your vehicle at all times. Check all mirrors frequently while driving.

To be certain that others are aware of your intentions, always signal whenever you plan to turn or change lanes. You should signal well in advance of a turn; signal continuously throughout the turn; and make sure to cancel the signal when you are finished turning.

Suspension systems receive weight capacity ratings, given by the manufacturers.

Before slowing down, it is a good idea to flash your brake lights by lightly tapping your brake pedal a few times. This will warn drivers behind you of your plans to slow down.

The only effective way to deal with drowsiness while driving is to stop and sleep. Caffeine or other stimulant drugs may help you stay awake, but they will not keep you alert. You will likely end up being even more tired when the artificial stimulants begin to wear off.

Trailers equipped with Anti-Lock Braking Systems (ABS) are equipped on the left rear with a yellow malfunction lamp. If the malfunction lamp stays on after the engine has been started, the ABS is malfunctioning.

If you use the parking brakes when the weather is very wet and the temperature is below freezing, the brakes may become frozen, preventing the vehicle from moving.

Maneuvers that may be included in the basic vehicle control skills test include straight line backing, offset back/right parking, offset back/left parking, driver side parallel parking, conventional parallel parking, and alley docking.

If your vehicle gets stuck on railroad tracks, immediately exit the vehicle and get away from the tracks. Check signs or signal housing at the crossing for emergency contact information. Call the emergency contact or call 911.

You should make frequent mirror checks to monitor the traffic around you. This should help you notice if surrounding vehicles begin to move into your blind spots.

The service brake system applies and releases the brakes when a driver presses the brake pedal while driving normally.

During a pre-trip inspection, you should activate your lights, then get out of the vehicle to look at them.

The suspension system holds up the vehicle and its load while keeping the axles in place. Damage to a suspension system can be very dangerous.

If at least one-fourth of the leaves in a leaf spring are missing, the vehicle will be put out-of-service until the defect is fixed.

If you are found to be operating a CMV with any detectable amount of alcohol in your system, but you are still below the legal limit of 0.04 percent, you will be placed out-of-service for 24 hours. It is both illegal and dangerous to operate a motor vehicle while under the influence of alcohol.

In an air brake system, the air compressor governor controls when the air compressor pumps air into the air storage tanks.

On a steep downgrade, you must use the engine's braking effect as your primary method of speed control. Be sure to decelerate and downshift appropriately before beginning to drive down the hill.

Convex mirrors are also known as "fisheye", "spot", or "bug-eye" mirrors.

In an air brake system, the air compressor pumps air into the air storage tanks. The air compressor is controlled by the air compressor governor.

Most heavy-duty vehicles use dual air brake systems. A dual system has two separate air brake systems with a single set of controls.