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

In what position should the converter dolly air tank drain valves and pintle hook be in?

open and latched

closed and latched

closed and open

open and open

2 / 40

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

there are no issues that occur from quick steering

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

3 / 40

Which of the following is NOT an important reason to look far ahead when you are driving?

determine if there are any hills coming up

determine if there are any upcoming traffic lights that might require you to stop

look for vehicles coming into your lane

look for brake lights from slowing vehicles

4 / 40

Students exit the bus and walk:

The distance it takes to clear the danger zone.

Across the street.

At least 10 feet away from the side of the bus.

At least 8 feet away from the side of the bus.

5 / 40

The bolst, brackets, or bushings that attach the air bag and/or spring to the vehicle and axle frame are _____.

spring mounts

shock dampeners

none of the answers listed

lug bolt

6 / 40

Why should you test the tractor protection valve?

to avoid loss of air from the trailer brakes

all answers listed

to avoid the emergency brakes kicking on due to loss of air

to avoid loss of air from the air hose

7 / 40

The crack-the-whip effect is more likely to cause the front trailer to tip over.

false

true

there is an equal chance for trailers to tip

trailers never tip

8 / 40

The minimum tread depth for steering axle tires is:

2/23 inch

14 mm

None of the answers listed

4/32 inch

9 / 40

Select the true statement:

wait to brake heavy vehicles for as long as you can

light vehicles require more braking power than heavier vehicles

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

you should always ride the brakes

10 / 40

The best way to have control on curves is:

you do not need to do anything different

to decrease to your safe speed before entering the curve and then accelerate through it

to shift to a lower gear before entering the curve

keep pressure on the brake pedal through the turn

11 / 40

How often should you check your cargo?

every 150 miles or every three hours

within the first 50 miles after beginning a trip

after every break you take during driving

all of these answers are correct

12 / 40

Which of the following is a key steering component?

leaf spring

bearing plate

torque rod

gear box

13 / 40

The direction of liquid movement not prevented by baffles is:

Side to side.

Bottom to top.

None of the answers listed.

Back to front.

14 / 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.

200 feet behind the bus.

The right and left front tires touching the ground.

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

15 / 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 applies the brakes and holds the throttle in idle position when the rear door is open.

The interlock releases when you close the rear door.

All of these answers are correct.

16 / 40

What does outage mean?

It is the allowance needed for the expansion of liquid.

It is the movement of the liquid.

It is how quickly the tanks drain.

It is the weight of the liquid.

17 / 40

To decide which placards you need, if any, what three things do you need to know?

Packing group numbers, amount being shipped, and amount of all hazardous materials of all classes on your vehicle.

Materials hazard class, amount being shipped, and amount of all hazardous materials of all classes on your vehicle.

Materials hazard class, percentage of total volume, and amount of all hazardous materials on your vehicle.

Materials hazard class, location being shipped, and amount of all hazardous materials on your vehicle.

18 / 40

Select the true statement in regards to the liquid inside of a bulk tank causing a tank truck to roll sideways.

All answers listed.

It can occur even when driving at the posted speed limit.

It can occur even with baffles inside that slow the flow.

It can occur when driving through a curve.

19 / 40

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

2 psi a minute

5 psi a minute

3 psi a minute

6 psi a minute

20 / 40

Your bus starts to lean toward the outside on a banked curve, you are:

Driving on a wet surface.

Driving with bad tires.

Driving too fast.

Driving in the mountains.

21 / 40

What keeps air in the tanks should the air compressor develop a leak?

the air compressor

the engine protection valve

the one-way check vavle

the tractor relay valve

22 / 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 100 feet.

At least 25 feet.

At least 50 feet.

At least 75 feet.

23 / 40

Which signals may be used to warn of a stopped vehicle that contains explosives?

Reflective triangles

All of these answers are correct

Flares or fuses

Signal fires

24 / 40

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

All answers listed.

The size of the tank.

The legally allowed weight limits.

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

25 / 40

Which of the following should you NOT do if you experience a tire failure?

engage the brakes hard and immediately

hold the steering wheel firmly

stay off the brake pedal

you need to be aware that a tire has failed

26 / 40

How should the trailer be lined up when preparing to back the tractor up?

directly behind the trailer

about 12 degrees to the left

directly in front of the trailer

about 12 degrees to the right

27 / 40

Select the true statement in regards to your brake function when your ABS fails

there is a huge fire risk

you will have no control over your truck as the brakes will not be functioning

the abs will need to be repaired but the brakes will function normally

you will need to pull over immediately

28 / 40

You should have the fifth wheel plate greased as recommened because:

it will ensure a good air line connection

it will prevent steering problems

it will reduce noise and heat

it will ensure a good electrical connection

29 / 40

What is the purpose of a driver placarding his or her vehicle?

Communicating risk.

Forcing other drivers to stay 20 feet away in every direction.

Warning those with children to drive in another lane.

Giving people something interesting to look at while driving.

30 / 40

In what location must you keep your shipping papers which describe any hazardous materials?

In a locked glove compartment anytime you are outside of the vehicle.

On the driver's seat anytime you are outside of the vehicle.

In a fire-safe pouch under the passenger seat while you are driving.

In a fire-safe pouch under the driver's seat that you can reach while you are driving.

31 / 40

On tandem axle for trailers, the sliding mechanism and locking device is:

Metal frame

Tandem release (locking pin/arm)

Fifth wheel

Air brake system

32 / 40

Select how brakes work on long, steep downgrades:

they are a supplement to the braking effect of the engine

it is the main braking mechanism

it does not do anything

it's the main braking mechanism with the engine braking system available for emergency situations

33 / 40

Select the portion of the combination vehicle that is most likely to turn over suddenly when pulling a double trailer:

the back trailer

the tractor

the front trailer

all are equally likely

34 / 40

Which of the following statements about downshifting is NOT true?

downshift before starting down a hill

downshift when you get to the bottom of a hill

downshift before climbing a hill

downshift before entering a curve

35 / 40

The most stable tanker shape is:

Square

Elliptical

Cylindrical

Round

36 / 40

How should you know when to shift?

engine speed and the shift indicator light

every 3 to 5 seconds or engine speed

engine speed and road speed

road speed and wind speed

37 / 40

What school bus accidents should be reported?

Only accidents casusing injury.

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

No accidents.

All accidents.

38 / 40

What gauge on the dashboard indicates electrical system charging rate?

The air gauge

The power gauge

The coolant pressure gauge

The ammeter/voltmeter

39 / 40

What is a passive railway crossing?

The type of crossing where you can pass the tracks without stopping.

The type of crossing, which does not have any type of traffic control device.

The type of crossing on which the driver does not have to stop.

The type of crossing with no cross buck sign.

40 / 40

What is the purpose of a baffle?

It controls the surge of liquid forward and backwards.

It makes it easier to clean the tanker out.

It stops side to side surging.

It allows you to haul loads that are mixed.

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