Delaware CDL DMV Knowledge Test Class B 1

During the vehicle inspection test, you will need to show emergency equipment, including spare electrical fuses; three red reflective triangles, six fuses, or three liquid burning flares; and a properly charged and rated fire extinguisher.

Check each slack adjuster after setting wheel chocks and disengaging the parking brake. Pull the slack adjusters to make sure they do not move more than about one inch from where the push rod is attached. If they move more than one inch, they may be out of adjustment and will need to be fixed.

In a vehicle with air brakes, the brake lights are activated when the brake pedal is pushed and air pressure moves an electric switch. With the application of air pressure, the switch will then turn on the brake lights.

In general, a smaller vehicle will be able to come to a complete stop faster than a larger vehicle. Keep this in mind when determining your following distance.

If you think the road surface may be becoming icy but you are not certain, you can open your window and feel the front of the side mirror, mirror support, or antenna. If ice has formed on any of these items, the road is likely becoming icy as well.

Compressed air in an air brake system usually has a certain amount of water and oil in it. This can harm the system if allowed to accumulate. Air tanks have drain valves to aid in removing water and oil from the compressed air.

Driving with a dry bulk tank requires special care, both because dry bulk tanks have high centers of gravity and because their loads often shift in transit. Be especially careful when taking turns and curves while operating such a vehicle.

If a tractor-trailer is so equipped, the trailer brake hand valve can be used to stop the vehicle from rolling back when being started from a stop.

When exiting your vehicle during the basic vehicle control skills test, you must face the vehicle and maintain three points of contact at all times. If your testing vehicle is a bus, you must maintain contact with the handrail. Exiting the vehicle incorrectly may result in automatic failure of the basic control skills test.

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.

Parking brakes should always be checked before driving as a part of your pre-trip inspection. If the parking brakes do not hold, the vehicle is faulty and should be fixed.

If you are convicted of any kind of traffic violation in any type of vehicle, you must notify your employer within 30 days of the incident. You must also inform your motor vehicle licensing agency within 30 days if the incident happened in another jurisdiction. This rule does not apply to parking infractions.

Before beginning a trip, it is important to check the brake drums during your walk-around inspection. It is unsafe to drive if any brake drum has a crack more than one half of the width of the friction area.

All commercial motor vehicles are required to be equipped with the proper emergency equipment. This may include spare electrical fuses; three red reflective triangles, six fuses, or three liquid burning flares; and at least one properly charged and rated fire extinguisher.

Compressed air in an air brake system usually contains a certain amount of water and compressor oil. The water and oil can damage the brakes if left to accumulate in the system. Tanks must be drained regularly to remove this build-up.

When driving a school bus, you must activate your four-way flashers while approaching and crossing a railroad crossing. Deactivate the flashers once your entire vehicle has cleared the tracks.

Be especially cautious when driving on ice that has begun to melt. Ice that is wet is much more slippery than ice that is dry.

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.

You will be denied a hazardous materials endorsement, or lose an existing endorsement, if you renounce your U.S. citizenship; are not a lawful permanent U.S. resident; are wanted for, indicted for, or convicted of certain felonies; are judged mentally defective or are committed to a mental institution; or are deemed by the Transportation Security Administration (TSA) to pose a security threat.

The total stopping distance for vehicles equipped with air brakes is made up of four factors: perception distance, reaction distance, brake lag distance, and braking distance. When braking at a speed of 55 mph while driving on dry pavement, the brake lag can add around 32 feet to a vehicle's total stopping distance.

If a tractor is equipped with an Anti-Lock Braking System (ABS) but the trailer is not, the risk of jackknifing will be reduced and the driver should still be able to maintain steering control. If only the trailer is equipped with ABS, it is less likely that the trailer will swing out to one side.

Gross Vehicle Weight (GVW) is defined as the total weight of a single vehicle in addition to its load.

Cargo and its securing devices must be inspected before starting a trip. After beginning a trip, the driver should check the load and securing devices within the first 50 miles on the road, every three hours or 150 miles traveled, and after every break.

After an engine is started, the warning lights and buzzers for oil, coolant, charging circuits, and the Anti-Lock Braking System (ABS) should go out right away.

There are two indicators that determine when you need to shift into a higher gear. One indicator is the engine speed (rpm). You should read your vehicle's manual to learn its rpm range and shift up when you reach the top of that range. The other indicator is road speed (mph). You should learn which speeds each gear can accommodate, then keep an eye on the speedometer and shift up as needed.

In general, if you operate a commercial vehicle in interstate commerce, it must be registered under the International Registration Plan (IRP) and International Fuel Tax Agreement (IFTA). These programs collect and distribute vehicle registration fees and fuel taxes based on what jurisdictions you drive in and for how long. Mileage and fuel records supporting IFTA quarterly fuel tax returns must be retained by carriers for four years.

In an air brake system, the application pressure gauge shows how much air pressure is being applied to the brakes. Not all vehicles with an air brake system have this gauge.

You must use the proper number of tie-downs when securing cargo on a flatbed trailer. Examples of tie-down equipment includes ropes, straps, and chains.

Good drivers scan the road at least 12 to 15 seconds ahead of their vehicles. Looking ahead will allow you to identify and react to hazards before meeting them. Be sure to specifically look for vehicles that are coming onto the highway, entering into your lane, or turning.

If the coolant temperature gauge goes above the highest safe temperature, you should stop driving as soon as possible and try to figure out what is wrong. There could be an issue in your vehicle that could lead to engine failure and possibly a fire.

To prevent rolling backward when starting from a stop, you should partly engage the clutch before removing your foot from the brake. Apply the parking brake whenever necessary to prevent your vehicle from rolling back.

Black ice is a thin layer of ice that is clear enough for the road surface to be seen through it. A road covered in black ice may look like it is merely wet.

During the vehicle inspection test, you must check the power steering belt, water pump belt, alternator belt, and air compressor belt for snugness, cracks, or frays. If any of these components are not belt-driven, you must tell the examiner which one(s), and verify that they are operating properly, mounted securely, and not damaged or leaking.

Drivers with blocked vision may pose hazards to others on the road. Examples of such drivers include those who haven't scraped ice off of their windshields; those driving vehicles loaded with large items blocking the windows; and those who are driving rental trucks without being used to the limited rear visibility of a truck.

A modulating control valve allows a driver to gradually apply spring brakes. In equipped vehicles, the valve is controlled by a lever located on the dashboard.