kentucky
CDL Practice Test

Welcome to the site for practicing questions on the Kentucky CDL test. The site is free and you are able to take the practice test as many times as you need to. Questions are from the KY CDL Manual and cover items such as Air Brakes, Double/Triple Trailers, Hazardous Materials, and School Busses. You will be presented with 40 questions and you must answer 34 questions correctly to pass. There is a 50-minute time limit. You may not go back once you answer a question. Click the "Start Test" button below to begin.

1 / 40

What is the first thing to do if your vehicle catches fire while driving?

pull off the road and park in an open area

open the hood and let the flames die down

open the door and jump out of the vehicle

find a service station to pull into

2 / 40

Air brake systems should not lose air faster than____when testing for air leakage rates in combination vehicles before applying the brake pedal.

3 psi a minute

5 psi a minute

2 psi a minute

6 psi a minute

3 / 40

What should you do before you begin to couple?

activate the spring brakes

check your path for any hazards

position the fifth wheel beforehand

inspect the condition of the frame of the tractor

4 / 40

Select the reason as to why you should not use the trailer hand valve while driving.

it could cause the trailer to skid

the trailer brakes will not be evenly applied

it should not be used on dry roads due to road conditions

it releases too much air from the system

5 / 40

The purpose for the emergency air line is:

supply air to the trailer air tanks and on combination vehicles, controls the service brakes

supply air to the tractor air tanks and on combination vehicles controls the emergency brakes

to supply air to the trailer air tanks and, on combination vehicles, controls the emergency brakes

none of the answers listed

6 / 40

If your engine runs a pump used during delivery of compressed gas, should you turn off the engine before or after unhooking hoses after delivery?

Turn it off after product transfer, before you unhook the hose.

Turn it off before product transfer, before you hook the hose.

Turn it off during product transfer, while unhooking the hose.

None of these answers are correct.

7 / 40

What action should you take before driving while drowsy?

drink a cup of coffee

open your vehicle windows for some fresh air

drink energy drinks

pull off the road and get some sleep

8 / 40

These tires should have a minimum tread depth of 4/32 inches.

Donut tires

Drive axle tires

Non-steering axle tires

Steering axle tires

9 / 40

When driving with multiple trailers, which one should be right behind the tractor?

the trailer with the heaviest load

the trailer with the smallest road

the trailers shortest in length

the trailer longest in length

10 / 40

Select the true statement about empty trucks:

they have a smaller stopping distance than full trailers

they have poor traction due to wheel lockup and bouncing

empty trailers are easier to stop because there is not cargo shifting

empty trucks stop in the same distance as a fully loaded truck

11 / 40

There must not be more than_____for engine compartment belts.

1/2 inch of play at the center of the belt

1/2 inch of play at the end of the belts

1/4 inch of play at the ends of the belt

3/4 inch of play at the center of the belt

12 / 40

Which of the following is not a prohibited practice on the bus:

Talking with riders while driving.

Towing a disabled bus with riders aboard when getting off would be a safe option.

Refueling in a closed building with riders on board.

Fueling your bus with riders on board if about to run out of fuel.

13 / 40

The walls that separate compartments inside the tanks and having openings at the top and bottom are called:

Free walls

Bulktears

Baffles

Layers

14 / 40

Under which two special conditions should you downshift?

before starting down a hill and before entering a curve

if there is an accident and in sudden heavy rain

before starting down a hill and before going up a hill

before entering a curve and before going up a hill

15 / 40

For what reason do you keep the starter switch key in your pocket during the pre-trip inspection?

so you don't lose it

you will need it to inspect the trailer

so no one moves the vehicle while you are inspecting underneath it

you will need it to open the side box

16 / 40

Drivers placard their vehicle to _____ the risk.

take away

communicate

elevate

minimize

17 / 40

Urban mass transit coaches may have a brake and accelerator interlock system. Which of the following statements is true?

The interlock applies the brakes and holds the throttle in idle position when the rear door is open.

All of these answers are correct.

The interlock releases when you close the rear door.

Do not use this safety feature in place of the parking brake.

18 / 40

You do not have a hazardous materials endorsement on your commercial driver license. When can you legally haul hazardous materials?

Only when the vehicle does not require placards.

Only when the shipment does not cross state lines.

Only in the event of a federally declared emergency situation.

Never.

19 / 40

What is most likely to occur when driving a tanker truck and the front wheels begin to skid?

No matter how you steer, you will continue in a straight line.

The surge will disconnect the tank from the truck.

The tank will roll over.

Nothing will occur.

20 / 40

What school bus accidents should be reported?

Only accidents casusing injury.

No accidents.

All accidents.

Only accidents determined to be the fault of the bus driver.

21 / 40

Which of these statements about speed management and braking is true?

The posted speed limit will always allow you to stop safely.

You need about four times as much stopping distance at 40 mph as at 20 mph.

Stopping time increases by one second for each 10 mph over 20 mph.

The total stopping distance of a bus is the distance it takes to stop once the brakes are applied.

22 / 40

What does the amount of liquid you can carry depend on?

The outage of the liquid.

The vehicle's horsepower rating.

The center of gravity.

The material the baffles are made from.

23 / 40

You should make sure the_____before backing under a trailer.

air brakes have been shut off

trailer brakes are locked down

landing gear is fully raised

tractor shut off valve is normal

24 / 40

Which of the following is NOT something you need to know in order to determine if you need to use placards?

The amount of a substance or material being shipped.

The amount of all hazardous materials of all classes in your vehicle.

The substance or material's hazard class.

The manufacturing date for the materials.

25 / 40

A minimum tread depth of 2/32 inch is required for:

Non-steer axle tires.

Driving axle tires.

Donut tires.

Parking axle tires.

26 / 40

A leak rate for a straight truck or bus air brake system should not exceed _____psi per minute when the engine is off and the brakes are released.

27 / 40

How do you test the trailer service brakes?

test the brakes out while driving at 5 mph

apply the hand control and check to see if you feel the trailer brakes come on

release air to the spring brakes

apply pressure to the brake pedal

28 / 40

The method used to make sure the spring brakes will come on automatically is to:

Apply pressure on and off the brake pedal to decrease the air tank pressure. The parking brake knob should pop out when the air pressure drops to 120 psi.

Apply pressure on and off the brake pedal to increase the air tank pressure. The parking brake knob should pop out when the air pressure meets to the manufacturer’s specification.

Apply pressure on and off the brake pedal to decrease the air tank pressure while driving at a high a speed. The parking brake knob should pop out when the air pressure meets to the manufacturer’s specification.

Apply pressure on and off the brake pedal to decrease the air tank pressure. The parking brake knob should pop out when the air pressure meets to the manufacturer’s specification.

29 / 40

This gauge has a governor cut-off.

The ammeter gauge

Air gauge

Oil pressure gauge

The coolant temperature gauge

30 / 40

Select the true statement about seeing ahead.

good drivers will shift their attention from far and near and back and forth

all answers listed

many individuals do not look far enough ahead while driving

you should look up to 1/4 mile ahead when driving at highway speeds

31 / 40

Is it mandatory that all vehicles with air brakes have low air pressure warning signals?

for small vehicles only

for large vehicles only

yes

32 / 40

Select the statement that is true in regards to quick steering movements and triple/double trailers:

they flip over due to quick steering movements a lot easier than other vehicles

as you perform quick steering movements you should apply pressure to the brake pedal

it is easier to countersteer compared to other vehicles

there are no issues that occur from quick steering

33 / 40

In what position should the shut off valves on a the rear of the front trailer be in on a set of double trailers?

in a closed position

in a 1/3 way open position

in a halfway open position

in an open position

34 / 40

Your bus is disabled. With riders aboard, the bus may be towed or pushed to a safe place only:

By another bus with its four-way flashers on.

By a 27,000 lbs gvwr or larger tow truck.

If the distance is less than 500 yards.

If getting off the bus would be more risky for the riders.

35 / 40

Select the true statement about convex ("spot") mirrors.

they are against the law in the majority of states

you do not need to look at them as often as flat mirrors

they make things closer and larger than they really are

they make things look farther away and smaller than they actually are

36 / 40

What is most likely to occur when driving a set of doubles and a set of trailer wheels goes into a skid?

there will be a trailer jackknife

no matter how you turn the steering wheel, the rig will continue in a straight line

the rig will slide sideways but stay in a straight line

nothing will occur

37 / 40

When accelerating:

speed up smoothly and gradually and avoid jerking

do not engage the clutch before you take your foot off the brake

always use the parking brake to slow down

"hammer down" when your wheels start to spin

38 / 40

Is this statement true or false: You do not need to use the parking brake if are leaving your vehicle for a short amount of time.

only when the vehicle has over 60,000 miles on it

only when the vehicle has over 25,000 miles on it

false

true

39 / 40

Select the true statement about dual air brake systems.

all of these answers are correct

one system controls the front axle and the other controls the rear axle

there is a single set of brake controls

there is a primary system and a secondary system

40 / 40

Why should you know the outage?

Just in case you become a contestant in a trivia competition.

Heavier liquids don't require outage.

Baffles are not always permitted with certain types of liquids.

Liquids expand different amounts.

Your score is

The average score is 0%

4/5 - (3 votes)

CDL Category Practice Tests

CDL Practice Test

How To Get A kentucky Commercial Drivers License

All applicants must possess a valid Kentucky Class D driver’s license and meet all the below requirements to be eligible for their CDL. Applicants who are age 18 may apply for their CDL license. These drivers are restricted to in-state driving, may not operate school buses, or haul hazardous materials. Applicants must be 21 years of age or older to drive out-of-state and receive their School Bus and/or Hazardous Materials Endorsement(s). All drivers applying for their commercial driver’s license must provide the Division of Driver Licensing with a valid DOT medical card.

Drivers who fall into the below categories are disqualified from receiving their CDL:

Having more than one driver’s license.
Current license is suspended or revoked.
Being convicted of driving under the influence of alcohol within 24 months of submitting an application.
Being convicted of two or more serious moving violations within a 36 month period.

All CDL applicants are required to complete both knowledge tests as well as a practical skills test.

Endorsements
T – Double/ Triples
P – Passenger
N – Tank
H – Hazardous Materials
S- School Bus

Hit the Open Road

kentucky CDL License Test Tips

General knowledge tests for Class B and C driver applicants are comprised of 50 questions. Those applying for a Class A CDL are required to complete the initial 50 questions as well as 20 additional questions about combinations. Each endorsement requires the applicant to complete a separate knowledge assessment. Endorsements for Doubles/Triples, School Bus, Tank, and Passenger Transport are comprised of 20 questions. The Hazardous Materials Endorsement requires a 30 question test. Lastly, the removal of the Air Brake Restriction is comprised of 25 questions. All assessments must be passed with a score of 80 percent or better.

All applicants will need to take a skills test that assesses their ability to operate their intended vehicle. Once applicants receive their Kentucky CDL permit after completing the knowledge assessment(s), they may apply for the skills test 14 days later. The skills test is comprised of three different parts that will all be assessed in one testing session. These areas include the pre-trip inspection, basic control skills, and driving test. All applicants must successfully show their skills in all three of these areas to be considered eligible for their CDL.

Additional Information

Information on the Kentucky Division of Driver Licensing

The Kentucky State Police regulates CDL requirements in Kentucky. To get more information contact them via:

Website: http://kentuckystatepolice.org/drivers-testing/

Phone: 502.782.1800

Additional Kentucky CDL Helpful Links

Please use the links below to access more valuable Kentucky CDL testing resources and to learn more about practice driving tests for the state of Kentucky.

kentucky CDL Practice Test