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

The parking brakes should be used____in air brake vehicles.

only when parked on an incline

every time the vehicle is parked

as rarely as possible

only during post trip inspection

2 / 40

What position should the tractor protection control valve be in after coupling?

raised

normal

lowered

mid position

3 / 40

What do you need to do to supply air to the air tanks of the second trailer?

none of the answers listed

open the shut off valve at the back of both trailers

open up the shutt off valves on the rear of the first trailer and close the shut off valve at the back of the second trailer

close the shut off valves at the back of each trailer

4 / 40

To prevent a roll over a driver can 1) keep the cargo as low to the ground as possible and 2) _____.

have the fifth wheel's free play as tight as possible

take turns slowly

drive while intoxicated

have the brakes properly adjusted

5 / 40

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

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

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

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

6 / 40

When backing, what is the best method to use to avoid blind spots?

use mirrors on both sides

back towards the driver's side, where you can see better

look at your path

use a helper

7 / 40

This should have no illegal stickers, dirt, obstructions, or damage to the glass.

None of the answers listed

The rearview mirror

Mirrors and windshield

The headlights

8 / 40

When not towing a trailer, why should the tractor glad hands be locked?

the connected brake circuit will become a back up air tank

the system pressure will not build up

this should never be done

it keeps water and dirt out of the lines

9 / 40

When arriving at the destination announce:

All of these answers are correct.

The next departure time.

The location.

The reason for stopping.

10 / 40

You are checking the_______when looking at the dipstick to see if the lubrication is at the safe operating range or above the refill line.

oil level

coolant level

washer fluid level

battery fluid level

11 / 40

Select the true statement about retest markings:

It shows what type of inspection or test was completed.

All answers listed.

They must be stamped on the tank.

Must have a date of the last retest marked.

12 / 40

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

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

The interlock releases when you close the rear door.

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

All of these answers are correct.

13 / 40

An emergency escape ramp should be used _____.

only when not carrying a load

only when it is raining

only in ideal conditions

any time the truck experiences a significant loss of braking power

14 / 40

If the hazardous materials are classified as FORBIDDEN you should:

Remove the placards from the trailer.

Take special caution in transporting the material.

Refuse the load.

Place the materials in the front of the trailer.

15 / 40

Which of the following must be closed while the bus is in motion?

Emergency windows

Both hatches

Roof vents

Windows

16 / 40

Which of the following statements about overhead space is true?

warning lights are always installed on low bridges and overpasses

an empty van is lower than a loaded one

the weight of the cargo changes a truck's height

athe heights posted at bridges are usually accurate

17 / 40

The reason a bulk liquid tanker is hard to handle is:

Because the cargo has a high density.

Because of the high friction point.

Because the cargo has a high center of gravity.

Because the cargo has a low center of gravity.

18 / 40

You should check that the following makes an audible noise:

Radio system

Electric or air horn

Engine brakes

Air leaks

19 / 40

When is it acceptable for non-hazardous materials to be described by hazard class words or identification numbers?

During an emergency

For hazards not described in the hazmat manual

Always

Never

20 / 40

If you park the trailer at an angle to the tractor when uncoupling:

the process will be faster and easier

damage could occur to the landing gear

you will have more space to maneuver in the lot

you won't have to take as many steps around the vehicle

21 / 40

You should_____when checking the slack adjusters on S-Cam brakes.

pull on the slack adjuster while the parking brakes are on

pull hard on each slack adjuster while wearing gloves

make sure there is an inch of leeway in each direction for the slack adjuster

pull on the slack adjusters after draining the air from the system

22 / 40

Which of the following materials would be an acceptable floor liner for moving Division 1.1 or 1.2 materials?

Stainless steel

Non-ferrous metal

All of these answers are correct

Carbon steel

23 / 40

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

Fuel.

Food or milk products.

Fertilizer.

Hydrogen peroxide.

24 / 40

A driver that hauls hazardous materials must attend training every:

None of these answers are correct

1 year

2 years

3 years

25 / 40

What school bus accidents should be reported?

No accidents.

All accidents.

Only accidents casusing injury.

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

26 / 40

When does stab braking occur?

when the wheels start rolling, apply the brakes

apply pressure all the way on the brake pedal

when the wheels lock up, release the brakes

all of these answers are correct

27 / 40

Check that the parking brake will hold by____when the parking brake is engaged and the trailer brakes released if not a combination vehicle.

all answers listed

shifting down to a low gear and trying to pull forward gently

shift up into a high gear and let off the clutch quickly

while in neutral increase the rpm to 1500

28 / 40

Select the true statement in regards to empty trucks:

they are easier to stop because there isn't cargo shifting in the trailer

they require a shorter stopping distance than a fully loaded trailer

none of the answers listed

they may have poor traction due to bouncing and wheel lockup

29 / 40

You should adjust all the outside left and right side convex mirrors to see:

The children's exit path out of the main bus door.

The entire area to the rear of the mirror along the side of the bus.

The right and left front tires touching the ground.

200 feet behind the bus.

30 / 40

To transport cargo safely, which of these are you NOT responsible for?

recognizing possible overloads

inspecting the cargo

making sure that cargo is properly secured

ensuring the freshness of sealed cargo

31 / 40

What is incorrect concerning disruptive passengers?

It may be safer to wait and discharge the disruptive passenger at the next scheduled stop or a well-lighted area where there are other people.

Don't discharge such riders where it would be unsafe for them.

You must remove the disruptive passenger immediately for the safety of the others.

You must ensure the disurptive rider's safety as well as that of others.

32 / 40

Why does it take special skills to haul a tank vehicle?

All of the answers listed.

There is a high center of gravity.

The weight of the load is high up off the road.

It is top heavy.

33 / 40

Why should you use chocks when parking a trailer without spring brakes?

to prevent someone from stealing the vehicle

to prevent a runaway trailer

the trailer wheels are free to turn as there will be no service brakes should the air supply in the trailer air tank leak

the trailer wheels are free to turn as there will be no emergency brakes should the air supply in the trailer air tank leak

34 / 40

Which of the following are some suspension system defects?

all of these answers are correct

cracked or broken spring hangers

broken leaves in leaf spring

leaking shock absorbers

35 / 40

You should check the_____when loading small tanks equipped with bulkheads.

distribution of the weight

expansion rate

fuel to air ratio

percentage of water

36 / 40

Double and triple trailers should be driven with care to avoid a rollover or jacknife.

only on downgrades

true

only in ideal conditions

false

37 / 40

Select the true statement:

light vehicles require more braking power than heavier vehicles

you should always ride the brakes

a bobtail tractor will take longer to stop than a combination vehicle that is loaded to the max

wait to brake heavy vehicles for as long as you can

38 / 40

Which of the following is NOT a part of the steering system?

tie rod

hydraulic fluid reservoir

main spring

steering knuckle

39 / 40

By law, the warning lights must only be used when approaching a:

Stop to load or unload students.

Busy intersection.

Sharp turns.

Any stop the bus makes.

40 / 40

Which of the following statements is FALSE?

if a tire blows, you should put the brakes on hard to stop quickly

stopping is not always the safest thing to do in an emergency

anti-lock braking systems (ABS) only activate when wheels are about to lock

you can almost always turn to miss an obstacle more quickly than you can stop

Your score is

The average score is 70%

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