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

In the slide mechanism of the sliding fifth wheel, this object should have no missing pins or be loose when fully engaged.

Locking pins

Rock jaw

Kingpin

Pintle hook

2 / 40

This should be cleaned and then adjusted properly while inside the cab.

The headlights

The mirrors

The windshield

The lug bolts

3 / 40

The air leakage rate for a combination vehicle should not exceed ____psi a minute.

4 / 40

Which of the following is a key steering component?

torque rod

bearing plate

gear box

leaf spring

5 / 40

Select the true statement about slack adjusters:

they do not ever need to be adjusted

they should only be adjusted by a mechanic that is certified in slack adjusters

they can be adjusted automatically or manually

they should move a minimum of 2 inches from the push rod attachment

6 / 40

It is important to know the outage required for the liquids you carry because:

Tank baffles may not always be permitted with outage.

Some liquids will expand more than others when warm.

None of these answers are correct.

Some of the denser liquids don't need any.

7 / 40

You should turn off your engine when loading flammable liquid unless:

The material does not need a placard.

You are a non-smoker.

You are loading at night and need the headlights.

You need the engine to run the pump.

8 / 40

The manual says you should look _____ ahead while driving.

5 to 8 seconds, at highway speeds, about an eighth of a mile

9 to 12 seconds, at highway speeds, about a quarter of a mile

15 to 20 seconds, at highway speeds, about a half of a mile

12 to 15 seconds, at highway speeds, about a quarter of a mile

9 / 40

When you have a major leak in the service line and put on the brake, the service air pressure will escape and cause the:

the trailer emergency brakes to activate

the trailer tank pressure to decrease

the tractor spring brakes to activate

none of the ansers listed

10 / 40

What might happen if a trailer is too high when you try to couple?

the queen pin may fall off

it may not correctly couple

the trailer may tip to the side

all answers listed

11 / 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 substance or material's hazard class.

The manufacturing date for the materials.

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

12 / 40

Which of the following is a clue another driver is impaired:

Exiting the interstate when there's no gas station visible.

All of these answers are correct.

Stopping at a green light, or waiting too long at a stop.

Open window in warm weather.

13 / 40

The locking jaws of the kingpin should close around:

the shank

the tip

the base

the apex

14 / 40

You should_____when the low pressure warning is activated:

wait until the air brakes kick in automatically

maintain highway speed and keep an eye on your air pressure gauge

pump the brake pedal to come to a stop immediately

come to a safe stop while you still have control of the brakes

15 / 40

You should never brake and should rely only steering inputs to avoid a crash while driving a tanker truck.

True, but only on downgrades

True

False

True, but only in ideal conditions

16 / 40

The Emergency Response Guidebook (ERG):

Was created by the national department of transportation, so it is used nationwide.

Contains an index of hazardous material id numbers, which is why you must label things correctly.

Is studied by emergency personnel to help keep the public safe.

All of these answers are correct.

17 / 40

Which of the following statements about bus evacuation is true?

If time allows, backup to the stop before evacuating the bus.

If time allows, notify the dispatcher about evacuation location, conditions, and type of assistance needed.

If time allows, walk through the bus and close all windows.

If time allows, notify the police.

18 / 40

What are you checking when looking at the lubrication level on a dipstick?

The power steering fluid level

The oil level

The windshield wiper fluid level

The horn fluid level

19 / 40

It is very important that you never smoke around which hazard classes?

All hazard classes.

It is ok to smoke anywhere.

Explosives, flammable gas, oxidizers, flammable solids, flammable liquids.

Corrosive, radioactive, dangerous, slippery when wet, inhalation.

20 / 40

How often should you check the cargo you are transporting?

all of these answers are correct

every 150 miles or every three hours

within the first 50 miles after beginning a trip

after every break you take during driving

21 / 40

If there is no traffic light or attendant, how far from the draw of a drawbridge must you stop?

30 feet

100 feet

5 feet

50 feet

22 / 40

You must not allow riders to stand:

Within two feet of any window.

In front of the standee line.

Within two feet of an emergency exit.

Between the wheel wells.

23 / 40

This object should not be damaged, bent, or rusted through and be evenly centered with the tires and dual wheels evenly separated.

All answers listed

Lug bolts

Tire rims

Budd spacing or spacers

24 / 40

A tractor should not be backed under a trailer until the whole air system is:

at a level of 50 and 70 psi

at a normal pressure

at half of its normal pressure

at a level of 70 and 90 psi

25 / 40

Unless you_____you will feel the effects of a liquid surge.

make turns carefully and slowly

haul thick liquids

all answers listed

gradually come to a stop

26 / 40

Your vehicle is going down a long hill and your brakes begin to fail. What should you do?

downshift

pump the brake pedal

put the gears in neutral

look for an escape ramp or an escape route

27 / 40

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

Talking with riders while driving.

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

Refueling in a closed building with riders on board.

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

28 / 40

Of the following hazardous material classes, which is the most dangerous?

Division 64

Division 63

Division 61

Division 62

29 / 40

If you have riders on board, you must never refuel:

At any time.

In a closed building.

Unless on a scenic tour bus.

With any window open.

30 / 40

Drivers who transport route controlled radioactive materials must carry a dated certificate of radioactive materials training. This training must have ocurred within the last:

2 years

1 years

4 years

3 years

31 / 40

What is a common cause of tire fires?

cold tires

underinflated tires

overinflated tires

all of these answers are correct

32 / 40

An air system that is fully charged will typically have ___ psi of pressure.

250

200

125

33 / 40

If you are driving a 100-foot truck with double trailers at 30 mph in dry conditions, how many seconds of space should there be between your truck and other vehicles?

34 / 40

What is a king pin?

it is a pin that holds the wheel on to the axles

it is a pin that locks the air brake lines together

it is a pin that a driver receives for being a safe driver

it is a pin that locks the trailer to the tractor on the fifth wheel

35 / 40

It takes special care to drive tankers with liquid in them because:

The low center of gravity of the load.

The movement of the liquid even when the truck is stopped.

The baffles create odd rocking motions.

The high center of gravity of the load.

36 / 40

Select the answer that is not a part of the braking process when driving a tractor-trailer combination vehicle that has ABS:

you should drive at a higher speed to keep the trailer in line

you should brake in the same manner regardless of what you are driving

only use the braking that is necessary to safely stay in control of the vehicle

you should monitor the tractor and trailer as you decrease your speed to keep control

37 / 40

You should line up_____when getting ready to back under the trailer.

for the kingpin to activate on the driver's side first

directly in front of the trailer

about 12 degrees to the left of the trailer

above 12 degrees to the right of the trailer

38 / 40

After deciding the type of evacuation that is necessary, the next step you must take is:

Securing the bus.

Dangle the radio microphone out of the driver window for later use.

Notifying the dispatch office of the evacuation.

Opening the emergency exits.

39 / 40

How far before a railroad crossing should you stop your bus?

15 to 50 feet

100 feet exactly

10 to 35 feet

50 to 75 feet

40 / 40

Select the statement of what you should not do if you are required to drive through flowing water or deep puddles.

shift into a lower gear

increase engine rpm

drive at a high speed

quickly turn the steering wheel side to side

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