CDL General Knowledge Test -JS

You will lose you CDL for one year if:

All of the above

You could lose you CDL for life if:

You are convicted of a felony involving drugs

The new BAC (Blood Alcohol Concentration) level is:

.04

The Driver's Vehicle Inspection Report must be filled out:

At the end of the trip

You are checking your tires during the pre-trip inspection. Which of these statements is true?

Tires of mismatched sizes should not be used on the same vehicle

You are checking your wheels and rims for a pre-trip inspection. Which of these statements is true?

Rust around wheel nuts may mean they are loose

Which statement about brakes is true?

None of the above

Which of these pieces of emergency equipment should be carried at all times on your vehicle?

All of the above

Which of these is not part of the check the engine compartment done for pre-trip inspection?

Valve clearance

When doing your pre-tip inspection, which of the following would you not do?

Check main bearing

How many red reflective triangles are you required to carry?

3

Where must the ignition (starter) key be during the pre-trip inspection walk-around?

In your pocket

How do you test the foot brake on the hydraulic system?

With the vehicle stopped, pump the pedal 3 times, apply firm pressure, then hold to see if the pedal moves

You are testing the service brake on a hydraulic system. Which of these can mean there is a problem with the service brake?

All of the above

When should you test your parking brake?

While the vehicle is parked

An enroute inspection should included checking:

All of the above

When must you use a seatbelt?

At all times while driving a commercial vehicle

You are starting your vehicle in motion from a stop. As you apply power to the drive wheels they start to spin. You should:

Take your foot off the accelerator

Which of these statements about backing a heavy vehicle is true?

You should avoid backing whenever you can

The most important instruction for you to give someone helping you back is:

The signal to stop

A tachometer tells you what?

RPM of the engine

Which of these statements about double clutching and shifting is true?

You can use the sound of the engine to tell you when to shift

When driving down a long downgrade, you should:

Go down in a lower gear than the one you used to go up

Which of these statements about downshifting is true?

When you downshift for a curve, you should do so before you enter the curve

An engine brake or retarder:

Saves wear and tear on brake linings

The purpose of a retarder is to:

Help to slow the vehicle while driving and reduce brake wear

How far should a driver look ahead of the vehicle while driving?

12-15 seconds

Which of these statements about using mirrors is true?

There are "blind spots" that your mirror can not show you

Which of these statements about pre-tip inspections is true?

Steering wheel play of more than 10 degrees can make it hard to steer

You should use your mirrors to check:

All of the above

Convex mirrors are not suitable for:

Judging distance

Which of these statements about using turn signals is true?

When turning, you should signal early

Which of these is a proper use of vehicles lights and flashers?

All of the above

Heavy vehicles must sometimes travel more slowly than other traffic. Which of these is NOT a good rule to follow when you are driving such a vehicle?

Signal other drivers when it is safe for them to pass you

Which of these should you NOT do when passing a vehicle

Move as close to the other vehicle as you can before pulling into the passing lane

Which of the following are factors in stopping distance?

All of the above

You must park on the side of a level, straight two-lane road. Where should you place the 3 reflective triangles?

One within 10 feet of the rear of the vehicle, one about 100 feet to the rear and one about 100 feet from the front of the vehicle

For your safety, when setting out reflective triangles you should:

Hold the triangles between you and oncoming traffic

When do posted speed limits apply?

When conditions safely allow

For an average driver, driving 55 mph on dry pavement, it will take about what distance to bring the vehicle to a stop?

The length of a football field

Which of the following statement about speed management is true?

If you double your speed, stopping distance will increase by four (4) times

Which of these statements about speed management is true? Which of these statements about brakes is true?

The heavier a vehicle or the faster it is moving, the more heat the brakes will have to absorb to stop it

Which of these statements about speed management is true?

All of the above are true

When is a wet road the slickest?

Just as it begins to rain

What should you do when your vehicle hydroplanes?

Release the accelerator

Hydroplaning:

Is more likely if tire pressure is low

You are driving a heavy vehicle. You must exit a highway using an off ramp that curves downhill. You should:

Slow down to a safe speed before the turn

Which of these statements about speed management is true?

You should choose a speed that lets you stop within the distance that you can see ahead

You are driving a vehicle with a light load. It could be safely driven at 55 mph on an open road. But traffic is now heavy, moving at 35 mph though the speed limit is 55. The safest speed for your vehicle in this situation is most likely:

35 mph

You are driving a 40 foot vehicle at 35 mph. Driving conditions are ideal (dry pavement, good visibility). What is the least amount of space that you should keep in front of your vehicle to be safe.

4 seconds

If you are being tailgated you should:

Increase the space in front of your vehicle

Strong winds make it difficult to stay in your lane especially when:

Coming out of a tunnel

Which of these statements about overhead clearance is true?

A vehicle's clearance can change with the load carried

You are driving a long vehicle that makes wide turns, you want to turn left from Pine Street to Cedar Street. Both are two-lane, two-way streets. You should:

Begin turning your vehicle when you are halfway through the intersection

You are driving a long vehicle that makes wide turns, you want to make a left turn from Elm Street onto Oak Street. There are two left turn lanes on Elm Street, and Oak Street is a four lane street with two lanes in each direction. You should:

Use the rightmost turn lane

Which of these statements about crossing or entering traffic with a heavy vehicle is true?

Heavy vehicles need larger gaps in traffic than cars

Which of these statements about staying alert to drive is true?

The only thing that can cure fatigue is sleep

Which of these is a good rule to follow when driving at night?

Keep your speed slow enough that you can stop within the range of your headlights

High beams should:

Be used whenever it is safe and legal to do so

Which of these statements about cold weather driving is true?

Windshield washer antifreeze should be added to the washer reservoir

The road you are driving on becomes very slippery due to black ice. Which of these is a good thing to do in such a situation?

Stop driving as soon as it is safe to do so

You must drive on a slippery road. Which of these is a good thing to do in such a situation?

Slow down gradually

When the roads are slippery, you should:

Make turns as gently as possible

Your brakes can get wet when you drive through a heavy rain. What can this cause when the brakes are applied?

All of the above

You should avoid driving through deep puddles or flowing water. But, if you must, which of these steps can help keep your brakes working?

Gently pressing the brake pedal while driving through the water

Which of these statements about tires and hot weather is true?

You should inspect your tires more often because the air pressure is more likely to get high

Which of these will help keep an engine cool in hot weather?

All of the above

Which of these statements about engine overheating is true?

You should never remove the radiator cap on a pressurized system while the engine is hot

Which of these statements about downshifting for a long downhill grade is true?

It allows engine compression and friction to help the brakes slow the vehicle

Which is a good rule to follow when driving downhill?

Be in the proper gear before starting down the grade

You are driving a modern (newer) truck with a manual transmission. What gear will you probably have to use to take a long downhill grade?

A lower gear than was used to climb the hill

Which describes the condition of the trucks brakes while going downhill?

Brakes will always heat up when going downhill

Which statement is true about proper brake application?

All of the above

Which of these statements about escape ramps is true?

All of the above are true

Ramp speeds are standard for:

Cars

A moving vehicle ahead of you has a red triangle with an orange center on the rear. What does this mean?

It may be a slow moving vehicle

The most important reason for being alert t o hazards is so:

You will have time to plan your escape if the hazard becomes an emergency

Your vehicle is in a traffic emergency and may collide with another vehicle if you do not take action. Which of these is a good rule to remember at such a time?

Heavy vehicles can almost always turn more quickly than they can stop

Which of these is a good rule to follow when steering to avoid a crash?

Don't turn any more than needed to clear what is in your way

You are driving on a two lane road. An oncoming driver drifts into your lane and is headed straight for you. Which of these is generally, the best action to take?

Steer to the right

You are driving in the right lane of a four lane, undivided highway road. You come over a hill and find a car stopped ahead in your lane. You do not have room to stop, and the hill blocks your view to the rear. Which of these is most likely the best action to take?

Steer to the right

Some traffic emergencies may require you to leave the road. Which of these is a good thing to remember?

Brake gently to avoid skidding

If you need to leave the road in a traffic emergency, you should:

Avoid braking until your speed has dropped below 20 mph

To avoid a crash, you had to drive onto the right shoulder. You are now driving at 40 mph on the shoulder. How should you move back onto the pavement?

Come to a complete stop, if possible, before steering back onto the pavement

Controlled braking:

Is used to keep a vehicle from skidding

Stab braking:

Involves locking the wheels

Which of these is the most important thing to remember about emergency braking?

If the wheels are skidding, you can't control the vehicle

Your vehicle has hydraulic brakes. While traveling on a level road, the system loses pressure and your brakes fail. Which of these statements is true?

Pumping the brake pedal may bring the pressure up so you can stop the vehicle

You are traveling down a long, steep hill. Your brakes begin to fade and then fail. What should you do?

All of the above

Which of these is a sign of tire failure?

All of the above

You are driving on a straight, level highway at 50 mph. There are no vehicles in front of you. Suddenly a tire blows out on your vehicle. What should you do first?

Stay off the brake until the vehicle slows down on its own

Which of these can cause a vehicle to skid?

Turning too sharply

The most common cause of serious vehicle skids is:

Driving too fast for road conditions

How do you correct a rear-wheeled acceleration skid?

Stop accelerating and de-clutch

To correct a rear-wheeled braking skid, you should:

Release the brakes and steer/countersteer

What is counter steering?

Turning the wheel in the opposite direction after steering to avoid a traffic emergency

If a straight vehicle (no trailer or articulation) goes into a front wheel skid, it will:

Go straight ahead even if the steering wheel is turned

Which of these is not a good rule to follow when protecting an accident scene?

Do not move any of the involved vehicles off the road until law enforcement personnel arrive

Which of these is not a good rule to follow when caring for injured at an accident scene?

Keep injured person cool

Which of these can cause a fire?

All of the above