idaho
CDL Practice Test

Idaho! 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. Good luck!

1 / 40

______is a device that connects the service and emergency air lines between the tractor and trailer.

Top off valves

Glad hands

Service lines

Relay knife

2 / 40

Select the true statement about stop valves in a cargo tank:

They protect the piping and tank during rear end collisions.

They will close in an emergency.

They are manually operated.

They will fall off in an emergency.

3 / 40

How do you make sure the trailer height is correct before coupling?

visually check that the rear trailer is lower than the fifth wheel so that the trailer raises slightly when the dolly is pushed under it

visually check that they are level height wise

you do not need to do a visual check

visually check that the lead trailer is higher than the fifth wheel so that the trailer will lower when the dolly is pushed under it

4 / 40

Where should you place your warning devices if you must stop on a one-way or divided highway?

10 feet, 100 feet, and 200 feet toward approaching traffic

20 feet, 50 feet, and 100 feet toward approaching traffic

50 feet, 100 feet, and 150 feet toward approaching traffic

100 feet, 200 feet, and 300 feet toward approaching traffic

5 / 40

Operating a motor vehicle with the intent of doing harm to others or physically assaulting a driver or their vehicle is known as?

road rage

aggressive driving

tailgating

defensive driving

6 / 40

The minimum tire tread depth for front tires is:

1/32-inch

3/8-inch

4/32-inch

1/2-inch

7 / 40

Why should you know the outage?

Heavier liquids don't require outage.

Liquids expand different amounts.

Baffles are not always permitted with certain types of liquids.

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

8 / 40

What will happen should a driver cross the air lines when hooking up the an older trailer?

the brake pedal will activate the trailer spring brakes instead of the air brakes

the hand valve will activate the tractor brakes instead of the trailer brakes

none of the answers listed

if there are no spring brakes, you can drive on but there will be no trailer brakes

9 / 40

If you double your speed, what will happen to your stopping distance?

it stays about the same

none of these answers are correct answers are correct

it increases by four times

it increases by two times

10 / 40

Before backing under the trailer you should______when coupling a tractor and trailer with air lines already connected.

press down on the brake pedal twice

all answers listed

have the trailer brakes off

supply air to the trailer system and then pull the air supply knob out

11 / 40

Suspension systems:

keep the axles in place

keep the brake drums from failing

keep the steering wheel tight

keep the load secure

12 / 40

What does the amount of liquid allowed in the tank depend on?

All answers listed.

The size of the tank.

Whether and how much the liquid will expand during the trip.

The legally allowed weight limits.

13 / 40

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

at a level of 70 and 90 psi

at a level of 50 and 70 psi

at half of its normal pressure

at a normal pressure

14 / 40

How do you determine if slack adjusters need to be adjusted?

activiate the parking brake and service brake

release the parking brakes and service brakes

pull out the automatic slack adjustment control knob

release the parking brakes and activate the service brakes

15 / 40

The minimum tread depth for tires other than the front tires is ____.

3/32

2/32

4/32

1/32

16 / 40

Should the air pressure in the service air tanks fall below____the driver must be alerted via warning mechanism in the truck cab.

60 psi

50 psi

30 psi

80 psi

17 / 40

Two causes of tire fires are ______.

under-inflated tires and poor retreads

duals that touch and road debris

under-inflated tires and duals that touch

hot brakes and under-inflated tires

18 / 40

Which of the following statements about loading and unloading cargo tanks is false?

The person attending the tanker must have a clear view of it.

The person in attendance must be authorized and able to move the vehicle.

The person in attendance must be aware of the danger.

The person in attendance must be within 50 ft of the tanker.

19 / 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?

20 / 40

How can you determine if your vehicle is equipped with ABS?

look for wheel speed sensor wires that are coming from the rear of your brakes

check if your vehicle was manufactured after March 1, 1998 (they are required to have the panel light)

check for yellow abs malfunction lamps on the instrument panel

all of these answers are correct

21 / 40

The bus driver must accept responsibility for supervising and controlling students while on the bus route. Who is the person in charge?

Students on the bus.

Parents of the students on the bus.

The school district superintendent.

Bus driver.

22 / 40

The trailer should be lowered so that _____.

it is slightly raised when the tractor is backed under it

you are able to use the landing gear to make adjustments

the tractor comes in contact with the nose of the trailer

the trailer is high above the fifth wheel

23 / 40

Five hazard classes that require placarding in any amount are ______.

corrosive 4, hazardous 14, flammable 2, explosives 7, and radioactive 12

none of these answers are correct

explosives 11, corrosive 8, flammable 3, explosives 14, and poison 61

poison gas 23, dangerous when wet 43, explosives 13, explosives 12, and explosives 11

24 / 40

You need to raise the landing gear just to the height of where it clears the pavement before driving.

only in ideal conditions

false

true

only in raining conditions

25 / 40

Overhead inside mirror is used to:

monitor traffic that approaches and enters the blind spot area

see all of the students

see the blind spot immediately behind the bus

see the area where students exit the bus

26 / 40

What is the normal operating range for a truck's oil pressure?

20-30 psi

30-75 psi

40-60 psi

This is engine-specific

27 / 40

Is it important to look into the back of the fifth wheel to see if the lockpin is locked in?

only every 7 days

only at the end of the shift

yes

28 / 40

A drawbridge does not have a traffic light showing green or a traffic control attendant. How many feet before the draw of a bridge must a bus driver stop?

At least 75 feet.

At least 25 feet.

At least 50 feet.

At least 100 feet.

29 / 40

Select what you should do before leaving the vehicle unattended:

remove the keys from the ignition

chock the wheels

apply the parking brakes

all of these answers are correct

30 / 40

When stopping for railroad tracks, you must stop no closer than how many feet before the nearest track?

31 / 40

The brake pushrod should not move more than____for manual slack adjusters.

an inch when pulled by hand with the brakes released

1-2 inches while the brakes are set

checking is not required in vehicles built after 1994 as they have automatic slack adjusters

movement is not allowed

32 / 40

Which of the following statements is true about speed management?

The posted speed limit is safe for all conditions.

All of these answers are correct.

You should be able to stop within the distance that you can see ahead.

Speed limits for buses are the same as cars.

33 / 40

If you are already carrying 100 pounds of silver cyanide, what precautions must you take if you are given papers at a dock to carry 100 cartons of battery acid?

Make sure there is plenty of space between the two.

Make sure the battery acid is loaded on top of the silver cyanide.

Inform someone and not load the battery acid.

Make sure the silver cyanide is loaded on top of the battery acid.

34 / 40

The golden rule for school buses when approaching and crossing railroad tracks is:

Stop, look, and turn on the radio lights overhead.

None of these answers are correct.

Stop, go, and stop.

Stop, look, and listen.

35 / 40

When should you drain air tanks that do not have an automatic tank drain?

every 4 hours of the working shift

at the end of each working day

once every 7 days

once every 14 days

36 / 40

What is the earliest way to notice a trailer skid?

you can feel it pulling your steering wheel

you can feel a jerk in the back of the tractor

you can see it in your mirrors

you can hear the tires squealing

37 / 40

This object should be clean with no obstructions, illegal stickers or damage to the glass.

The side mirrors

The headlights

The lighting indicators

The windshield

38 / 40

Select the statement that is true in regards to what is required of a driver with a double or triple trailers:

none of the answers listed

all of the answers listed

drive with extra care in mountains and in bad weather

increase your following distance

39 / 40

What do you check when doing a visual inspection of the coupling?

that the locking jaw is closed around the kingpin and that there is no space between the upper and lower fifth wheel

none of the answers listed

that the locking jaw is open around the kingpin and that there is some space between the lower and upper fifth wheel

the locking jaw is closed around the kingpin and there is no space beween the lower and upper fifth wheel

40 / 40

Remember to____when connecting the converter dolly to the rear trailer.

lock the trailer brakes

all answers listed

ensure that the landing gear is slighty off of the ground

check the trailer height

Your score is

The average score is 0%

5/5 - (2 votes)

CDL Category Practice Tests

CDL Practice Test

How To Get A idaho Commercial Drivers License

Applicants can be age 18 or older when applying for their CDL. Those under the age of 21 are not eligible for the Hazmat or Doubles/Triples Endorsement. All applicants must get a DOT medical card to shows their ability to be physically able to drive a commercial motor vehicle.

Any drivers that fall into the following categories are disqualified from receiving their CDL:

Having more than one driver’s license.
Being convicted of an impaired driving offense in a commercial vehicle within the prior 24 months to submitting the CDL application.
Current suspended, revoked, denied, or canceled driver’s license.
Having CDL disqualifications in other states.

All applicants are required to complete a practical skills test and knowledge test in order to receive their CDL. Adding endorsements to a CDL will require additional knowledge tests and practical skills tests.

Endorsements
T – Doubles / Triples
P – Passenger
N – Tank Vehicles
H – Hazardous Materials
X – Tank Vehicle That Carries Hazardous Materials

Hit the Open Road

idaho CDL License Test Tips

Applicants for an Idaho CDL must complete a written knowledge test to showcase their retention of the commercial driving laws. Class A drivers are required to take a 70 question assessment that includes 20 questions specifically about combination vehicles. Class B and C applicants are required to pass a 50 question assessment. Those seeking endorsements and removal of the Air Brake Restriction must take additional tests that range between 20 and 30 questions. All tests must be passed with a score of 80 percent or better.

CDL applicants are required to pass a three-part skills test. These parts include a driving test, basic control skills test, and vehicle inspection test. This can be completed at an Idaho State Driving Facility or other approved testing site.

Additional Information

Information on the Idaho Transportation Department

The Idaho Transportation Department administers the CDL requirements and testing in Idaho. To get more information contact them via:

Website: https://trucking.idaho.gov/commercial-drivers-license-cdl/

Phone: 208.334.8000

Additional Idaho CDL Helpful Links

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

idaho CDL Practice Test

CDL Category Practice Tests

CDL Practice Test

How To Get A idaho Commercial Drivers License

Hit the Open Road

idaho CDL License Test Tips

Additional Information

Information on the Idaho Transportation Department

Additional Idaho CDL Helpful Links

idaho
CDL Practice Test