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

Why should you not use the trailer hand brake to straighten out a jack knifing trailer?

the tractor wheels caused the skid in the first place once the trailer wheels grip the road again, the trailer will start to push the tractor and straighten out

none of the answers listed

the trailer wheels caused the skid in the first place once the trailer wheels grip the road again, the trailer will start to follow the tractor and straighten out

this is the only situation in which you should use the hand brake

2 / 40

Select the reason as to why air tanks need to be drained:

tanks usually do not need to be drained

to prevent the left sided brake from locking up

to release water and other contaminents which may cause brakes to fail in freezing weather

to provide greater control of your vehicle

3 / 40

Select the true statement in regards to driving a truck with triple or double trailers:

the truck requires increased following distance compared to smaller vehicles

all answers listed

the risk of trailer jackknifes and tipping is increased compared to shorter trucks

extra care should be taken when driving in bad weather and in the mountains

4 / 40

A commercial motor vehicle (CMV) is defined as:

all of these answers are correct

a vehicle with a gross weight over 26,001 lbs

a vehicle transporting hazardous materials

a vehicle transporting 16 or more passengers

5 / 40

Which of the following is NOT an acceptable type of marking for hazardous materials?

Name in italics

Un marks

Descriptive name in roman print

Identification number

6 / 40

Select the statement that best describes what the trailer air supply control does:

when pushed it it supplies the trailer with air and when pulled out it supplies the tractor with air

when pushed in it supplies the tractor with air and when pulled out it supplies the trailer with air

when pushed in it supplies the trailer with air and when you pull it out it shuts off the air supply and puts on the trailer emergency brakes

when pulled out it supplies the trailer with air and when pushed in it shuts off the air and puts on the trailer emergency brakes

7 / 40

When driving tank vehicles you should:

None of the answers listed.

Come to a stop before entering a curve and then accelerate through it.

Decrease your speed before entering a curve and then accelerate through it.

Maintain the posted speed limit as you enter the curve.

8 / 40

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

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

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

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

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

9 / 40

You are driving a 60 foot truck at 55 MPH, how much space (in seconds) should you keep in front of you?

7 seconds

8 seconds

6 seconds

5 seconds

10 / 40

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

2/32

3/32

1/32

4/32

11 / 40

The trailer should be lowered so that _____.

the trailer is high above the fifth wheel

the tractor comes in contact with the nose of the trailer

it is slightly raised when the tractor is backed under it

you are able to use the landing gear to make adjustments

12 / 40

The cause of almost half of all truck driver deaths are:

a result of following behind too closely

a result of rollover

a result of changing lanes too frequently

a result of excessive speed

13 / 40

Buses are prohibited from carrying all of the following hazardous materials except:

Properly labeled poison gas canisters.

Materials labeled radioactive in the space occupied by people.

Small-arms ammunition.

Properly secured tear gas canisters.

14 / 40

When driving normally, some drivers use the hand valve before applying the brake pedal to prevent jack knifing. Select the most appropriate response to this statement.

should be used with caution and only if you are aware of the dangers

it is the best possible way to brake and maintain the truck in a straight path

it should not be done

it will result in less skidding than when just using the brake pedal alone

15 / 40

What is a king pin?

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

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

16 / 40

Which of the following types of cargo can never be carrier on a bus with riders?

Emergency drug shipments.

Emergency hospital supplies.

Small arms ammunition (orm-d).

Emergency tear gas.

17 / 40

Should your air compressor stop working:

you will lose your ability to brake immediately

the brakes will lock up on you immediately

there will still be air pressure left in the air tanks

there will be no affect to your brakes

18 / 40

Drivers placard their vehicle to _____ the risk.

elevate

take away

minimize

communicate

19 / 40

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

the trailer with the smallest road

the trailers shortest in length

the trailer with the heaviest load

the trailer longest in length

20 / 40

Which of the following statements about downshifting is NOT true?

downshift before entering a curve

downshift before starting down a hill

downshift before climbing a hill

downshift when you get to the bottom of a hill

21 / 40

In what position should the converter dolly air tank drain valve be in for double trailer combination?

in an open position

in a 1/3 open position

in a halfway closed position

in a closed position

22 / 40

The locking jaws of the kingpin should close around:

the tip

the shank

the apex

the base

23 / 40

The basic description of a hazardous material includes the hazard class, the identification number, and the proper shipping name. Which one must appear first on the shipping paper?

The proper shipping name.

The box number.

The identification number.

The hazard class.

24 / 40

This object should not have any missing parts, be fully raised, the crank handle is secured, and that there is no damage to the frame.

Lifts/doors/tires

Drop arm

Release arm

Landing gear

25 / 40

Vehicle handling can become unsafe if the weight is not properly balanced. Hard steering can be caused by:

too much weight on the steering axles

too little weight on the driving axles

under loaded front axles

high center of gravity

26 / 40

This object releases the fifth wheel locking jaw to allow uncoupling.

The locking pins

The apron

The release arm

The arm bar

27 / 40

You should place the starter switch key into your pocket while you are performing the pre-trip inspection because:

someone could start and move the truck

all of these answers are correct

someone could steal the truck

it could damage the starting mechanism

28 / 40

Do not tow or push a disabled bus with riders aboard the vehicle, unless:

Your employer tells you to.

Getting off the bus would be unsafe.

You are also a class a tow truck driver.

Bus is on a drawbridge.

29 / 40

Select which is not an engine compartement belt:

A water pump belt

A safety belt

A power steering belt

An air compressor belt

30 / 40

At what "cut out" level does the governor stop pumping air?

150 psi

125 psi

75 psi

100 psi

31 / 40

Select the true statement in regards to stopping distance and speed:

Larger / heavier vehicles generally take longer to stop.

You require 4 times as much stopping distance when driving at 40 mph compared to 20 mph.

All answers listed.

A wet road will double the stopping distance at any speed.

32 / 40

What is the safest way to stop unruly behavior on the bus?

keep checking the rear view mirror so you can see what happened and report to the principal

have the unruly students move to the front of the bus

yell loudly for the students to sit down and behave themselves

pull off the road in a safe location, secure the bus, stand up, and tell the students what behavior you expect of them

33 / 40

You are driving a 40 foot truck at 35 MPH, how much space (in seconds) should you keep in front of you?

5 seconds

4 seconds

6 seconds

3 seconds

34 / 40

The school bus driver may be the only contact person from school system some parents meet. The percentage of such parents is as high as:

0.65

0.85

0.5

0.72

35 / 40

What product is typically carried in a liquid tank trailer without baffles?

Food or milk products.

Fuel.

Hydrogen peroxide.

Fertilizer.

36 / 40

Select the true statement about what the Air Compressor Governor controls:

it controls when the brakes will be applied

it controls when the air compressor pumps air into the storage tanks

it controls when air is released from the storage tank

it controls when the warning system is activated

37 / 40

The interlock system for the brake and accelerator on a transit coach may be used:

As a safety feature when the exit door is open.

To replace the parking brake.

All of these answers are correct.

To replace the rear door emergency buzzer.

38 / 40

Within 3 minutes, this gauge pressure should build to 90 psi from 50 psi.

Voltmeter gauge

Oil pressure gauge

Coolant pressure gauge

Air pressure gauge

39 / 40

What method should be used to test that the air is flowing to all the trailers?

only a certified mechanic can check for this

check the pressure indicator dial on the final trailer

listen for air flow after opening the shutoff valves at the rear of the last trailer

pump the brakes with the windows down

40 / 40

Which of the following is NOT a basic step to be taken at a crash scene?

gather the contact information of all the drivers involved

notify authorities

care for the injured

protect the area

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