Wyoming CDL: General Knowledge Practice Test

Not quite. The answer is Your home terminal

According to federal regulation 49 CFR 395.8 and FMCSA Guidance FMCSA-HOS-ELD-TECH-395-FAQ26, you must record your duty status according to the time zone at your home terminal, including daylight savings time if it is in effect at your home terminal. Your "home terminal" is the place designated by your carrier, where you report for work at the start of your workday. Note that your carrier's main office may not be in the same time zone as your carrier's home terminal. Consider keeping a watch or smartphone app always set to your home terminal's local time so you can more easily log those times.

Not quite. The answer is urea.

Today's large CMVs typically use a Selective Catalytic Reduction (SCR) system to reduce emissions of nitrogen oxides (NOx). Diesel Exhaust Fluid (DEF) is a 32.5% solution of urea in water. Yes, urea is also found in the urine of mammals, but there are other chemicals in urine as well. DEF is sprayed onto a special catalyst (a material that facilitates chemical reactions), and reacts with the NOx to form harmless nitrogen gas and water vapor, with a tiny amount of carbon dioxide as well. This system can reduce NOx emissions by up to 90%.

Not quite. The answer is ten minutes.

If you must stop on a road or the shoulder of any road, you must set out your emergency warning devices within ten minutes.

Not quite. The answer is The driver is inspected but not the vehicle.

The Level 1 roadside inspection is the most comprehensive inspection. It involves a 37-point inspection of both the driver and the vehicle. The Level 2 inspection is similar, except that nothing underneath the vehicle is inspected. In a Level 3 inspection, the driver is inspected but not the vehicle. In a Level 5 inspection, the vehicle is inspected but not the driver.

Not quite. The answer is is more likely when the tire pressures are low.

Hydroplaning is more likely if traction is low. This can happen if the tire treads are worn or the tire pressures are low (because there is less pressure pushing down on the road to supply traction).

Not quite. The answer is It makes the road slippery.

On hot days, tar in the pavement can rise to the surface and create a slippery film on the road surface.

Not quite. The answer is Wait until the vehicle ahead of you passes a shadow or landmark. Then count the seconds until you reach it.

Count how many seconds it takes you to reach some stationary object after the vehicle in front of you has passed it. You can count seconds as follows: "One-thousand-and-one, one-thousand-and-two,..." The other three choices here either will not work or involve dangerous distractions. Note that you should increase your following distance in heavy traffic, in bad weather, with heavy vehicles, or at higher speeds.

Not quite. The answer is 10 feet behind and up to 500 feet behind your vehicle.

This is required by federal regulation 49 CFR 392.22. This regulation also specifies where to place warning devices on other types of roadways such as undivided two-way roads and hills. These situations are also covered in the section on "Communicating Your Presence" in the Wyoming Driver License Manual for Commercial & Heavy Vehicles.

Not quite. The answer is The trailer can push the tractor sideways.

The most common type of skid by far is the drive-wheel skid. Drive-wheel acceleration skids can occur on slippery roads. Drive-wheel braking skids occur when braking causes the drive wheels to lock. Because locked wheels have less traction than rolling wheels, the rear wheels usually slide sideways in an attempt to "catch up" with the front wheels. With combination vehicles, a drive-wheel skid can let the trailer push the tractor sideways, causing a sudden jackknife.

Not quite. The answer is life.

The "No Human Trafficking on Our Roads" Act became law on January 8, 2018. On July 29, 2019, based on this law, FMCSA announced a new rule: Any driver who is convicted of human trafficking will be permanently banned from operating a CMV for which a CDL or a commercial learner’s permit (CLP) is required.

Not quite. The answer is In bias-ply tires, the plies criss-cross each other diagonally.

In a bias-ply tire, the plies are at an angle of 30–45 degrees to the centerline of the tread, so the plies crisscross each other diagonally. A radial tire has plies that are at an angle of 90 degrees to the centerline of the tread.

Not quite. The answer is Stay off the brake until your vehicle has slowed down.

In the event of a blowout at high speed, DON'T BRAKE unless you must do so to prevent a collision. Braking can lock the wheels and cause loss of control. Instead, hold the steering wheel firmly and keep your vehicle on course until it slows down. Then brake very gently, pull off the road, and stop.

Not quite. The answer is False

To use a fire extinguisher to put out a fire, stand upwind from the fire at a safe distance. Let the wind carry the extinguisher from you to the fire. Aim the extinguisher at the source or base of the fire, not up in the flames. Persist until the burning material has cooled to the point that the fire cannot restart.

Not quite. The answer is You will be put out-of-service for 24 hours.

There is no safe amount of alcohol with which to drive a CMV. Hence, if you are found to have any detectable BAC (even if it's under the legal limit of 0.04%), you will be placed out-of-service for 24 hours.

Not quite. The answer is Stop accelerating.

To recover from a skid, first stop doing what caused it in the first place. To recover from a drive-wheel acceleration skid, first take your foot off the accelerator. To recover from a drive-wheel braking skid, stop braking. To recover from a front-wheel skid that was caused by driving too fast for current conditions, slow down.

Not quite. The answer is someone could start and move the truck.

While you are performing the pre-trip inspection, you do not want someone (such as a co-driver) who is unaware of your location to start your vehicle and accidentally injure you.

Not quite. The answer is leaks.

During Step 5 (Walk-Around Inspection) of the Seven-Step Inspection Method, check the wheel bearing seals for any signs of cracks or leaks.

Not quite. The answer is the length of a football field.

For a tractor-trailer traveling at 45 mph on dry pavement, the typical perception distance is about 117 feet, the typical reaction distance is about 50 feet, the typical air brake lag distance is about 27 feet, and the typical braking distance is about 152 feet, for a total stopping distance of 346 feet. In comparison, the length of a football field (including the two end zones) is 360 feet.

Not quite. The answer is Level III

A Level III inspection is a driver inspection. The inspector interviews you and checks your CDL and other documents. The inspector checks whether you're wearing your seat belt. The inspector also looks for obvious signs of impairment on your part, such as being under the influence of alcohol. Finally, the inspector identifies and verifies your carrier to be sure it is authorized to operate in the country. Unlike Levels I and II, the inspector does not examine your vehicle or cargo.

Not quite. The answer is Flashing your brake lights to stop someone from tailgating

Use your headlights during times of lower visibility. Use your brake lights only to warn other drivers that you are preparing to slow down or stop, or there is a hazard ahead for which you'll have to slow down. If you're being tailgated, avoid such tricks as flashing your brake lights. Handle tailgaters in a different way: Keep right and increase your following distance.