Protect the driver during a crash

Ensure that controls are accessible

Usually follows the rules of the road.

Nebraska CDL Knowledge Test Class A 1 - DMV Written Test Questions with Answers

Q.1

Most heavy-duty vehicles use ____ air brake systems.

Single
Dual
Triple
Quad

Q.2

What do headers do?

Protect the driver during a crash
Provide a place for storage
Ensure that controls are accessible
Act as wind guards

Q.3

Before driving a vehicle with air brakes, you should ensure that the ____ come on automatically when air pressure falls below 45 psi.

Spring brakes
Parking brakes
Air brakes

Q.4

When going down a steep downhill, your primary source of braking should be:

Engine adjustments/downshifting.
Using the brake.
Using the parking brake.
Using ABS.

Q.5

A vehicle equipped with an Anti-Lock Braking System (ABS) can be identified by:

A sticker on the control panel.
A yellow lamp on the instrument panel.
The letters "ABS" on the brake pedal.
A metal plate on the inside of the driver’s side door.

Q.6

A ____ allows a driver to gradually apply spring brakes.

Modulating control valve
Trailer air supply control
Relay valve

Q.7

Eating while driving:

Is a good way to maximize your time.
Is encouraged during long trips.
Is a distraction to the driver.

Q.8

When driving in fog, you should:

Use the windshield wipers.
Use low beam headlights.
Use high beam headlights.
Use the air conditioning.

Q.9

____ is an example of required emergency equipment.

A spare electrical fuse
A loud horn
A battery-operated flashlight

Q.10

Once they have begun to drive after a tire on their vehicle has been changed, a driver should stop after a short distance to:

Ensure that the lug nuts are still tight.
Ensure that the tire is wearing evenly.
Ensure that the air pressure of the tire is still acceptable.

Q.11

Black ice is:

Usually thick.
Usually thin.
Not a hazard when driving.

Q.12

When should mirror adjustments be made?

Before starting a trip
While driving
When a vehicle is stopped at a traffic signal

Q.13

Driving in extremely hot weather:

Should not be done.
Requires you to remove oil from the engine.
Is safer with less coolant.
Can increase tire pressure.

Q.14

Failing to drain the tanks in an air brake system can result in:

Water freezing and causing brake failure.
Squishy brakes.
Too much air collecting.
Too much fuel being carried.

Q.15

If a tire fails, you should:

Use the brakes.
Stay off the brakes.
Swerve.
Wave your arms at other drivers.

Q.16

How much water needs to be on the surface of a road for a vehicle to hydroplane?

Usually several inches
A good amount, such as a large puddle
A small amount
None

Q.17

When inspecting cargo, the driver should ensure all of the following, except:

That the truck is not overloaded.
That the cargo is balanced.
That the cargo is secured properly.
That the cargo is heavier at the top than the bottom.

Q.18

Parked delivery trucks may be hazardous because:

The trucks are often shiny.
People are often in a hurry when exiting such trucks and may not look for other vehicles.
Packages often fall out of the trucks and into the road.

Q.19

When using road speed to know when to switch gears, you should:

Learn what speeds each gear is good for and shift up when necessary.
Watch other vehicles and try to keep pace.
Watch other trucks and shift when they shift.
Use the speed limit as a guide.

Q.20

What can happen if one-fourth of the leaves in a leaf spring are missing when a vehicle is inspected?

The vehicle’s driver will be allowed to drive, but only at reduced speeds.
The vehicle will be put out-of-service until it is fixed.
The vehicle will be fine to drive since most of the spring is in place.
The driver will be asked to decrease the weight of the load.

Q.21

During the vehicle inspection test, you will be required to do all of the following, except:

Walk around the vehicle.
Point to or touch each item.
Explain what you are checking and why.
Crawl under the vehicle.

Q.22

In a vehicle with dual air brakes, what happens if one system is low on pressure?

The air from the other system will be used to supplement the system with the low pressure.
The front or rear brakes may not work properly.
All brakes will be inoperable.
The low system will use an auxiliary system to fill the tank.

Q.23

During a basic vehicle controls skills test exercise, your vehicle's final position should be:

In the general area that was described by the examiner.
In the exact final position described by the examiner.
Within three feet of the final position described by the examiner.

Q.24

When using the controlled braking method in an emergency situation, you should:

Apply the brakes as hard as possible without locking the wheels.
Apply the brakes with about half of your usual force.
Apply the brakes so the wheels lock.
Apply the brakes with minimal pressure.

Q.25

During an applied leakage test, the maximum leakage rate for a double combination vehicle is:

10 psi in a minute.
8 psi in a minute.
6 psi in a minute.
4 psi in a minute.

Q.26

Where can you find the tire load rating?

On the inside of the driver’s door
On the dashboard
On the side of each tire
Under the hood

Q.27

When driving under wet conditions, what does a lack of spray from other vehicles indicate?

Ice has formed on the road.
The pavement is dry.
The spray is caught on the underside of the vehicle.
The tires have soaked up all the moisture.

Q.28

During an inspection, slack adjusters on S-cam brakes should not move more than:

One foot.
One centimeter.
One inch.

Q.29

Texting while driving is especially dangerous because:

It is both a mental and physical distraction.
A message may be upsetting to the driver.
People like to read and may become too engaged in their phones.

Q.30

Scan the road ____ ahead of your vehicle.

Two to three seconds
Five to six seconds
12 to 15 seconds

Q.31

How is water and compressor oil removed from the bottom of an air storage tank?

The water and oil are siphoned out of the tank.
A drain valve is opened to remove the water and oil from the tank.
The water and oil are removed automatically as the brakes are used.
A sponge is used to soak up the water and oil.

Q.32

When using a fire extinguisher to put out a fire, you should:

Stay as far away as possible from the flames.
Aim at the flames.
Use any extinguisher on every type of fire.

Q.33

In a dual air brake system, air pressure should build from 85 to 100 psi within ____ seconds.

Q.34

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.

Q.35

Too little weight on a steering axle can result in:

Poor traction.
Increased visibility.
Longer stopping distances.
Improved gas mileage.

Q.36

How many daily hours of sleep does an adult need to maintain alertness?

Six to seven
Seven to eight
Eight to nine
Four to five

Q.37

A distracted driver:

Usually follows the rules of the road.
Usually has slowed perception.
Is a good person to follow.

Q.38

When loading a trailer, weight should be:

Placed as high as possible.
Placed as low as possible.
Placed only on the left side, if possible.
Placed only on the right side, if possible.

Q.39

The driver of a commercial motor vehicle:

Can use any cell phone while driving.
Can only use a hands-free mobile phone while driving.
Can only use a cell phone on rural roads.
Can use a cell phone at night.

Q.40

Dual tires should be in contact with each other.

True
False

Q.41

When loading a trailer, it is important to:

Place as little weight as possible over the axles.
Place a well-balanced amount of weight over the axles.
Place weight over only the axles.

Q.42

When a construction worker is close to the road, you should:

Increase your speed.
Decrease your speed.
Not drive in any lane.
Wait until the construction is complete before proceeding.

Q.43

When accelerating on a surface with poor traction, such as a wet road, a driver should:

Speed up quickly.
Speed up slowly.
Not be concerned about the pavement.

Q.44

If a truck is equipped, a trailer brake hand valve can be used to:

Add fuel to the vehicle.
Prevent the vehicle from rolling back when being started from a stop.
Check the oil level.
Load cargo.

Q.45

When doing an inspection, make sure your brake pads are:

Covered in grease.
Covered in coolant.
Covered in oil.
Free of oil and grease.

Q.46

An Anti-Lock Braking System (ABS) will:

Shorten your stopping distance.
Not change the way you apply the brakes.
Allow you to drive faster.

Q.47

Vehicles with dual air brake systems:

Maintain full-capacity air pressure in the braking systems even when the vehicle is not running.
Maintain some air pressure in the braking systems when the vehicle is not running.
Must be run to build enough air pressure to brakes to operate properly.
Do not need time to build air pressure before a trip.

Q.48

During the vehicle inspection portion of the skills test, an applicant will be required to:

Explain to the examiner what should be checked and why.
Let the examiner check the vehicle.
Talk to a mechanic to prove their knowledge.
Take apart the front brake.

Q.49

Stopping distance can be affected by:

Speed.
Temperature.
Time of day.
Traffic.

Q.50

A tank endorsement is:

Only required when transporting gases.
Only required when transporting liquids.
Required to transport both liquids and gases.
Optional when transporting hazardous materials.