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New Mexico CDL DMV Knowledge Test Class A 1

Take 6 practice tests for CDL is the best way to prepare for your New Mexico DMV exam is by taking our free practice tests. The following question are from real New Mexico DMV practice test. More than 95% people pass a DMV exam when practice at DMV Practice Test.

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1. Mirrors should be used:
Only when there may be an emergency.
By a helper to monitor your blind spots.

When driving, you should frequently check the mirrors on both sides of your vehicle.

2. Too much air pressure in a tire:
Is not possible.
Is encouraged on long drives.
Can be dangerous.

Tires should never have too much air pressure. Be sure to check your tires' air pressure with a gauge during inspections.

3. Emergency brakes:
Are not required on vehicles with air brakes.
Are required only on buses.
Are required on all vehicles.

All trucks, truck tractors, and buses must be equipped with emergency brakes and parking brakes.

4. Dry bulk tanks:
Usually have low centers of gravity.
Usually have high centers of gravity.
Are usually not allowed to cross railroad tracks.

Dry bulk tanks require special care to be driven, both because they have high centers of gravity and because the weight of the load can shift in transit.

5. If the low air pressure warning signal comes on, you should:
Continue driving, but have the brakes repaired within a week.
Pull over and inspect the brakes.
Phone a mechanic while driving.

If the low air pressure warning signal comes on while you are driving a vehicle with air brakes, you should immediately bring the vehicle to a safe stop while you are still able to control the brakes. Inspect and repair the brakes as soon as possible.

6. If you are braking on dry pavement while traveling at 55 mph, how much distance will brake lag add to your overall stopping distance?
32 feet
45 feet
20 feet

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 the vehicle's total stopping distance.

7. How do ice cream trucks become hazardous to other drivers?
Ice cream trucks must be kept cold.
Children often run toward an ice cream truck without looking for other traffic.
Ice cream trucks leave trails of water and ice on the roadway.

Ice cream trucks can create hazardous conditions for other drivers because they attract children. Children often do not notice or pay attention to other vehicles on the roadway when running to or from ice cream trucks.

8. When starting an engine, oil pressure should come up to a normal level:
Within seconds.
Within five minutes.
After about three minutes.

Look at your truck's gauges when starting the engine. The oil pressure in an engine should come up to a normal level within seconds of the vehicle's engine being started.

9. If the safety relief valve in the air brake system releases air:
The compressor needs more air.
The air pressure has become too high.
The brakes are fully operational.

An air brake system has a safety relief valve, which releases air from the tanks if the pressure gets too high. If the valve must operate, something in the system is wrong and should be addressed by a mechanic.

10. If planning to change lanes, your mirrors should:
Not be checked.
Be checked as usual.
Be checked more often than usual.

While regular mirror checks should be part of your normal scanning routine, be especially sure to check your mirrors when changing lanes.

11. During the vehicle inspection test, you must be able to do all of the following, except:
Show where the power steering fluid dipstick is located.
Check for adequate power steering fluid.
Ensure that the power steering fluid level is above the full mark.

During the pre-trip vehicle inspection test, you will be asked to indicate where the power steering fluid dipstick or reservoir sight glass is located. You will need to show that the power steering fluid is within a safe operating range.

12. If you are turning left at an intersection where there are two available turn lanes:
It is best to use the right lane.
It doesn’t matter which lane you use.
It is best to use the left lane.

You may have to swing right to safely make a left turn. If there are two left turn lanes available at an intersection, you should always begin your turn in the rightmost lane.

13. If your vehicle is hydroplaning, you should:
Not use the brakes.
Put the vehicle in reverse.

If your vehicle begins to hydroplane, do not apply the brakes. Instead, slow down by releasing the accelerator and pushing in the clutch. This will help you to regain traction.

14. To ensure that you do not slow down traffic when driving a large truck, you should:
Switch gears while driving uphill.
Try to pass another vehicle while driving uphill.
Stay in the right lane whenever possible.

If a heavy load prevents your vehicle from keeping up with the speed of other traffic, you should stay in the right lane.

15. When making a left turn where there are two available turn lanes, a driver should begin the turn in the rightmost lane because:
It will be easier for the driver to keep track of turning vehicles on their left than on their right.
The vehicle will be able to turn more quickly.
Other vehicles will get out of the turning vehicle's way.

If making a left turn where there is more than one available turn lane, you should always choose to begin your turn in the rightmost lane. Large vehicles often have to swing right to make left turns. Because of this, it is safer for you to have other left-turning traffic to your left instead of to your right. This will allow you to have the best possible view of other turning vehicles and will lower the risk of your vehicle colliding with them.

16. If brakes fail on a long downgrade, the driver should:
Turn the vehicle off and then back on to reset the brakes.
Pump the brakes.
Look for an escape ramp or other way to stop.

If your brakes fail on a downgrade, your best option is to use an escape ramp. If no escape ramp is available, it is a good idea to look for a different escape route, such as a side road or open field.

17. Which of the following is not a type of distraction?

Distractions that can affect safe driving can be classified as physical (such as reaching for an object), mental (such as talking with passenger), or both (such as talking on a hand-held phone).

18. Without the proper amount of oil in its engine:
A vehicle will have difficulty stopping.
A vehicle will make quick, jerking movements while being driven.
The engine may be quickly damaged.

It is essential that a vehicle's engine have adequate oil pressure. An engine can be destroyed rapidly if it is run without oil.

19. If you will be transporting hazardous materials that require placards, you must:
Ask permission of the local law enforcement agency.
Obtain a hazardous materials endorsement.
Transport the materials only at night.

To operate a vehicle of any size that is used to transport hazardous materials requiring placards, you must have a CDL with a hazardous materials endorsement.

20. Backing with a trailer is dangerous because:
It is difficult to see behind the vehicle.
Most trucks do not have the ability to go in reverse.
Cargo may fall out of the trailer.

Backing up is always dangerous because it is impossible to see everything that is behind you. Only drive in reverse if it is absolutely necessary.

21. Drivers talking to passengers in their vehicle should be viewed as:
Responsible drivers.
Distracted drivers.
Knowledgeable drivers.

Drivers who are engaged in conversation with passengers may be distracted from the task of driving. Use extra caution when driving near distracted drivers.

22. Maintaining a cushion of space between your vehicle and the vehicle ahead is:
Not encouraged, as it slows the flow of traffic.
Encouraged, as it allows you time to react to unexpected hazards.
Only encouraged if you are traveling with a passenger.

For safe driving, it is essential that you maintain cushions of space on all sides of your vehicle. This helps to ensure that you will have time to take appropriate action if a problem arises.

23. In a dual air brake system, if one air system is very low on pressure:
None of the brakes will work at all.
Either the front or rear brakes will not be fully operable.
There is usually no noticeable effect.

In a dual air brake system, either the front or rear brakes will not be fully operable if one of the air systems gets too low on pressure. If the air pressure in either tank gets too low while you are driving, you should exit the road and park as soon as possible.

24. You must have an air brake endorsement:
To use a vehicle with air brakes.
To drive any truck with a trailer.
To transport hazardous materials.

You must take an air brakes knowledge test to become licensed to operate a vehicle that is equipped with air brakes, including an air over hydraulic braking system.

25. Which of the following is acceptable if found during a pre-trip inspection?
Tires of mismatched sizes
Cracks in the tires
Tires manufactured by different makers

Be sure to thoroughly inspect your tires before a trip. Tire sizes should not be mismatched, and tires should not be cut, cracked, or otherwise damaged in any way.

26. If a load is 40 feet long, the minimum number of tie-downs required to secure the load is:
Two tie-downs.
Three tie-downs.
Four tie-downs.

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.

27. While driving, ____ generally holds spring brakes in place.
Air pressure

While driving, spring brakes are generally held in place by air pressure. If the air pressure gets low enough, the springs will activate the brakes.

28. If asked by a law enforcement officer to take a test to determine your blood alcohol concentration (BAC):
You can refuse to take the test without a penalty.
You can refuse taking the test but will be required to pay a $50 fine.
You will lose your CDL if you refuse to take the test.

Most states have an Implied Consent Law, which means that by driving a vehicle on the state's roads, you have agreed to undergo a drug or alcohol test if a police officer asks you to do so. If you refuse to submit to a test, you will lose your operating privileges. Make sure you are aware of the laws for every state in which you drive.

29. ____ make up the emergency brake system.
Only parts of the parking brake system
Only parts of the service brake system
Parts of the parking and service brake systems

In an air brake system, there are three different braking systems: a service brake system, a parking brake system, and an emergency brake system. The emergency brake system uses parts of both the parking and service brake systems.

30. If a vehicle begins to hydroplane, the driver should:
Release the accelerator and push in the clutch.
Pull in the clutch and brake.

If your vehicle begins to hydroplane, you can regain control by releasing the accelerator and pushing in the clutch.

31. As part of a pre-trip inspection, you should look for all of the following, except:
Tires with too much air pressure.
Tires with too much wear.
Tires made by different manufacturers.

When inspecting your tires, verify that there is tread depth of at least 4/32 of an inch in every major groove on the front tires and tread depth of at least 2/32 of an inch in grooves on the other tires. Be sure that your tires are not too worn, are not cracked, have proper air pressure, and are all equally sized.

32. To avoid a hazard:
You should always steer to the left.
You may be able to drive onto the shoulder.
You should steer sharply in one direction.

In some emergencies, the best strategy for avoiding a hazard may be to drive onto the shoulder. Most shoulders are strong enough to support the weight of a large vehicle.

33. If planning to back a vehicle where there may be overhanging objects, a driver should:
Cut wires or branches as necessary.
Inspect the area before backing.
Not worry about the obstacles.

Because you can't see everything behind you, driving in reverse is always dangerous and should be done only when necessary. Before backing into an area, you should exit your vehicle and inspect the path of travel to check for potential hazards, especially overhanging objects that would otherwise be difficult to spot in a mirror.

34. Broken suspension parts:
Are not a cause for concern.
Are extremely dangerous.
Cannot be identified.

The suspension system holds up a vehicle and its load while keeping the axles in place. Defects in this system are extremely dangerous.

35. Over-length loads require:
Special permits.
Roads to be closed to other traffic.
A person to walk alongside the vehicle.

Over-length, over-width, and/or overweight loads may require special permits from the Department of Transportation.

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