New Hampshire CDL Practice Test

Not quite. The answer is One within 10 feet of the rear of the vehicle, one about 100 feet to the rear, and one about 100 feet in front of the 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 curves, one-way roads, and divided roadways. These situations are also covered in the section on "Communicating Your Presence" in the New Hampshire CDL Driver's Guide.

Not quite. The answer is The cargo you're carrying makes stopping mandatory under federal or state regulations.

A full stop is required at railroad grade crossings whenever (a) the nature of the cargo makes a stop mandatory under state or federal regulations, or (b) such a stop is otherwise required by law. For example, federal regulations require any CMV that is placarded for carrying hazardous materials to stop at every railroad grade crossing.

Not quite. The answer is Slow down gradually.

Braking on a slippery surface can lock the wheels and cause a skid. Brake gently and slow down very gradually.

Not quite. The answer is Vehicle frame

The vehicle frame is the main supporting structure of the vehicle, to which all other components are attached. It is supported by the vehicle's suspension.

Not quite. The answer is When you upshift, the engine speed should decrease to the rpm required for the next gear.

In double clutching, you apply the clutch twice: once to shift out of the current gear into neutral and again to shift out of neutral into the next gear. After you shift out of the current gear into neutral, adjust your engine speed to match the rpm required for the next gear. For a higher gear, allow your engine to slow down; for a lower gear, use the gas pedal to speed up the engine. Then shift out of neutral into the next gear.

Not quite. The answer is do both of the above.

In Step 4 (Turn Off Engine and Check Lights) of the Seven-Step Inspection Method, set the parking brake and turn off the engine. Turn on the low-beam headlights and four-way flashers. In Step 5 (Walk-Around Inspection), leave the cab, walk to the front of your vehicle, and make sure that these lights are working.

Not quite. The answer is both of the above.

Whenever you stop during your trip, check whether the cargo has shifted. Also check whether the tires or brakes are overheating. Overheating could cause them to fail or even start a fire.

Not quite. The answer is involves keeping a vehicle in a straight line when braking.

In controlled braking, you apply the brakes as hard as you can without locking the wheels, keeping movement of the steering wheel to a minimum.

Not quite. The answer is only where allowed by law.

Retarders help slow a vehicle, reducing the need for using your brakes. However, these devices can be noisy, and some jurisdictions prohibit their use.

Not quite. The answer is Rust around lug nuts may mean that they are loose.

Lug nuts must all be present and checked for tightness. Rust is a sign that the lug nut is loose.

Not quite. The answer is 6 holes backward

Under federal regulations, the maximum gross weight on the drive axles is 34,000 pounds, and the maximum gross weight on the tandem axles is also 34,000 pounds. (Note: States may impose their own axle weight limits on their roads. Be aware of the limits in the states you'll be traveling through.) In this case, the tandem axles are 1,000 pounds overweight. To calculate how far to slide the tandems to correct this problem, a formula favored by many truckers is to calculate half the difference of the drive axle weight and the tandem axle weight, and then divide that by 250 pounds per hole. (Some trailers can support more weight per hole. Check the specifications for your trailer.) In this case, 35,000 - 32,000 = 3,000 pounds. Now divide this figure by 2, which equals 1,500 pounds. Finally, divide 1,500 pounds by 250 pounds per hole, which equals 6 holes. In general, you should slide the tandems in the direction of the overweight condition. In this case, the tandem axles are overweight, so we slide the tandems backward. (If the drive axles were overweight, we would slide the tandems forward.) Therefore, the correct answer is 6 holes backward. In practice, however, we would also need to check whether the vehicle's weights are compliant with weight limits imposed by the federal bridge gross weight formula. (Note: Nowadays, there are smartphone apps available that can run the calculations for you.)

Source: 23 CFR 658.17

Not quite. The answer is You should adjust your mirrors before starting your trip.

Adjust your mirrors before you start your trip. If you're driving a tractor-trailer, you can check your mirrors accurately only when the trailer(s) are straight. You should check and adjust each mirror to show some part of the vehicle.

Not quite. The answer is both of the above.

Overloading can adversely affect steering, braking, and speed control. Also, most states impose maximum weight limits on CMVs to prevent excessive weight from damaging roadways or bridges.

Not quite. The answer is You should check tire mounting and air pressure before driving.

In hot weather, check the tire mounting and tire pressure carefully. Heat causes the air in the tire to expand, increasing tire pressure. Driving will make the tires even hotter. If the tire temperature and pressure rise too high, the tire may blow out or even catch fire.

Not quite. The answer is When the vehicle is moving at about 5 mph

To test the service brakes, do the following: Wait for normal air pressure, release the parking brake, move the vehicle forward at about 5 mph, and apply the brakes firmly. Check whether the brakes stop your vehicle promptly, and note any abnormal signs such as your vehicle pulling to one side.

Not quite. The answer is Valve clearance

In Step 2 (Check Engine Compartment) of the Seven-Step Inspection Method, you'll check a number of things, such as the condition of the hoses and electrical wiring insulation. However, you won't remove the valve cover to check the valve clearance.

Not quite. The answer is A burning tire should be cooled with water.

If the cargo is on fire, opening the trailer's doors will let more oxygen into the trailer and feed the fire. If a tire is on fire, it should be cooled, preferably with a lot of water.

Not quite. The answer is 3

To transport an individual metal coil (weighing at least 5,000 pounds) with its eye vertical on a flatbed truck, all of the following must be used: (1) At least one tiedown attached diagonally from the left side of the vehicle, across the eye of the coil, to the right side of the vehicle (2) At least one tiedown attached diagonally from the right side of the vehicle, across the eye of the coil, to the left side of the vehicle (3) At least one tiedown attached transversely (from side to side) over the eye of the coil (4) Either blocking and bracing, friction mats, or direct tiedowns to prevent forward-and-backward movement

Source: 49 CFR 393.120

Not quite. The answer is used to stop runaway vehicles.

Escape ramps are located on many steep mountain grades. Escape ramps are built to stop runaway vehicles safely without injuring drivers or passengers. Escape ramps use a long bed of loose, soft material such as gravel to slow a runaway vehicle, sometimes in combination with an upgrade.

Not quite. The answer is requires a special transit permit.

Over-length, over-width, or overweight loads require special transit permits. Such loads may also require pilot vehicles, a police escort, or special equipment such as flags, flashing lights, or "Wide Load" signs. Driving is usually limited to certain times. Each state may specify its own requirements and procedures to follow. [49 CFR 393.11],

Source: 49 CFR 393.87