Oregon CDL Practice Test

Not quite. The answer is both of the above.

How much liquid you can load into a tank depends on the following: (1) Heat makes liquid expand, so you must allow enough room at the top of the tank for outage. (2) A dense liquid may weigh so much that loading too much liquid into the tank may cause your vehicle to exceed state weight limits.

Not quite. The answer is starting the engine, then putting the gearshift in neutral.

Please note that the question says "EXCEPT." When performing this part of the inspection, start the engine after you have put the gearshift in neutral. Then listen for any unusual noises. Once you perform the engine check, you will check all your gauges and controls, such as the air pressure gauge and transmission controls.

Not quite. The answer is 4

The liver processes about one-third of an ounce of alcohol per hour, which is equivalent to at most one drink per hour.

Not quite. The answer is plus or minus 5 mph.

According to federal regulation 49 CFR 393.82, the speedometer of a CMV traveling at 50 mph must be accurate to within plus or minus 5 mph, which would be a relative error of plus or minus 10%. This requirement applies to buses, trucks, and truck tractors.

Not quite. The answer is The Working Load Limit is the maximum load that may be applied to a component of a cargo securement system during normal service. It is usually assigned by the manufacturer of the component.

The Working Load Limit (WLL) is the maximum load that may be applied to a component of a cargo securement system during normal service. It is usually assigned by the manufacturer of the component. No component of the cargo securement system should exceed its WLL during normal service.

Not quite. The answer is Neither of the above

Components N and O are bearing plates.

Not quite. The answer is Both of the above

When changing lanes, check your mirrors at each of the following times: (1) before you change lanes, to make sure there is enough room; (2) after you have signaled, to check that no one has moved into your blind spot; (3) right after you start the lane change, to double-check that your path is clear; and (4) after you complete the lane change.

Not quite. The answer is Broken shock absorber

According to federal regulations and the North American Out-of-Service Criteria, among the many violations that can place your vehicle out of service are a broken axle (49 CFR 393.207(a)), a broken leaf spring (49 CFR 393.207(b)), and a broken U-bolt (49 CFR 393.207(a)). However, a broken shock absorber is not considered an out-of-service condition.

Not quite. The answer is Take your foot off the accelerator.

If the force applied to the drive wheels exceeds the available traction of your tires on the road surface, the wheels may spin. This is more likely on snowy or icy surfaces, for which you have less traction. When traction is poor, accelerate very gradually. If the drive wheels start to spin, take your foot off the accelerator.

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 Leave your high beams on.

To avoid blinding other drivers, dim your headlights whenever you're within 500 feet of an oncoming vehicle or within 500 feet of a vehicle you are following.

Not quite. The answer is the parking brake.

When you start your vehicle, make sure you don't roll backward, or else you may hit something behind you. Put on the parking brake whenever necessary to keep from rolling backward. (Note: this may not be necessary when you're on a level surface with good traction.) Release the parking brake only when you have applied enough engine power to keep from rolling back.

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 provide enough traction to steer and push the vehicle through snow.

Snow-covered road surfaces provide much less traction than dry surfaces. Your tires must provide enough traction to maneuver your vehicle on snow safely. Under federal regulations, your front tires must have a tread depth of at least 4/32 inch, and all other tires must have a tread depth of at least 2/32 inch. For best traction, however, make sure that the treads are even deeper before you try to drive on snow.

Source: 49 CFR 570.62

Not quite. The answer is Much more than under normal driving conditions

Wet roads can double your stopping distance. Slow down and greatly increase your usual following distance.

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 Check the electrical connections.

If your trailer lights aren't working properly, the cause may be as simple as a loose electrical cable connection to the trailer, or perhaps to the tractor. Electrical connections can loosen over time from constant use. Wiggle each connector back and forth to see if it's loose. If it is, tie something around it to keep it from moving. If the connector isn't loose, check if the pins in the receptacle are clean and make good contact. Lastly, check if the cable itself is bad. If none of these are the cause of the problem, the next thing to check is the fuses or circuit breakers, and finally, the trailer light bulbs. Note: Don't ignore the problem. If any required trailer lights aren't working properly, your vehicle is in violation of federal regulation 49 CFR 393.23 and can be placed out of service at a roadside inspection.

Not quite. The answer is the tracks have a steep approach.

Raised railroad crossings with steep approaches can cause your vehicle to get hung up on the tracks. This is more likely if you're driving a vehicle with low ground clearance (such as a lowboy, car carrier, or moving van).

Not quite. The answer is All of the above

When choosing a safe speed for driving down a steep downgrade, consider its steepness, its length, the road and weather conditions, and the weight of your vehicle and its cargo.

Not quite. The answer is can be incorrectly connected to non-polarized trailer couplers.

To prevent cross-connection of the supply and service lines, polarized gladhands and polarized trailer couplers are now available. The supply gladhands and couplers are shaped slightly differently from the service gladhands and couplers, making cross-connection impossible. However, polarized gladhands can still be connected to universal (non-polarized) trailer couplers, so cross-connection in this situation is still possible.