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

One reason hauling liquids in tank vehciles require special care is:

Because of uneven expansion.

Because of the movement of the liquid.

Because of the extreme weight.

Because of strong winds.

2 / 40

You should_____when the low pressure warning is activated:

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

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

wait until the air brakes kick in automatically

pump the brake pedal to come to a stop immediately

3 / 40

Select the true statement in regards to an application pressure gauge:

it is connected to the generator

it shows how much air pressure you are applying to the brakes

when accelerating it releases air

it prevents the brakes from failing

4 / 40

What is the first thing to do if your vehicle catches fire while driving?

open the hood and let the flames die down

open the door and jump out of the vehicle

find a service station to pull into

pull off the road and park in an open area

5 / 40

The compressor is connected to the engine via _____?

stag gears

r-belt

v-belt or gears

lines

6 / 40

Which two special conditions indicate that you should downshift?

starting down a hill and entering a curve

starting up a hill and entering a curve

starting up a hill and finishing a curve

starting down a hill and finishing a curve

7 / 40

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

Sharp turns.

Stop to load or unload students.

Any stop the bus makes.

Busy intersection.

8 / 40

How do you test the trailer service brakes?

test the brakes out while driving at 5 mph

release air to the spring brakes

apply the hand control and check to see if you feel the trailer brakes come on

apply pressure to the brake pedal

9 / 40

Mirrors with a convex surface or "spot" mirrors _____.

they show a larger area than flat mirrors so do not need to be checked as often

make things look farther away and smaller than they actually are

are illegal in most states

make things look closer and larger than they actually are

10 / 40

How often should you check the tires if your placarded trailer has dual tires?

Check tires every 2 hours or 100 miles.

Check tires every hour or 75 miles.

Check tires every 4 hours or 200 miles.

Check tires every 3 hours or 150 miles.

11 / 40

When backing your vehicle, which of the following is NOT recommended

back towards the right side

back as slow as possible

use the lowest reverse gear

back and turn towards the driver's side

12 / 40

You should check your mirrors while making a lane change:

all answers listed

after you have completed the lane change

right after you start the lane change

after you signal your intent to change lanes

13 / 40

Tires should should be replaced:

when the tread separates

if the tread depth on your front tires is less than 4/32 deep

all of these answers are correct

when there are broken valve stems

14 / 40

The trailer height is correct for connecting a converter dolly to a second trailer when:

the top of the kingpin lines up with the locking jaws

the trailer will slightly lower when the converter dolly backed under it

the kingpin is resting behind the fifth wheel

the trailer will slightly rise when the converter dolly is backed under it

15 / 40

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

50 to 75 feet

100 feet exactly

15 to 50 feet

10 to 35 feet

16 / 40

Commerical vehicles typically have this type of brake.

S-Cam brakes

stab brakes

rectangle brakes

drum brakes

17 / 40

For Division 1.1 or 1.2 Explosives A, should the floor liner required be stainless steel?

Never use a floor liner for any explosive class

Any type of floor liner is sufficient

Yes

18 / 40

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

close the shut off valves at the back of each trailer

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

none of the answers listed

19 / 40

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

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

Notifying the dispatch office of the evacuation.

Securing the bus.

Opening the emergency exits.

20 / 40

To test the security of the tractor semi trailer connection you should:

you don't need to check it

with the trailer brakes locked, rock the trailer back and forth

look at it carefully after pulling forward gently in a low gear against the locked trailer brakes

put the tractor in a high gear and quickly pull ahead

21 / 40

Select the true statement in regards to crossing your air lines on a new trailer with spring brakes

you will be unable to release the tractor brakes

you will have brakes that are not operational

you will be unable to realse the trailer brakes

there is no way to know if there is an issue

22 / 40

You should brake on a long steep downgrade hill as a supplement to the braking effects of the engine

when the GVCW is above 20,000 lbs

when the vehicle is runaway

yes

23 / 40

What is the standee line?

A line around each seat to help each passenger have a little personal space.

A 2 inch line on the floor that all passengers must stay behind.

A 2 inch line down the aisle to help keep passenger traffic flowing.

A line at the back of the bus where passengers must stand before exiting.

24 / 40

Why should you know the outage?

Liquids expand different amounts.

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

Baffles are not always permitted with certain types of liquids.

Heavier liquids don't require outage.

25 / 40

Class A explosives must not be transported in a combination vehicle if the vehicle includes:

A placarded cargo tank.

Two or more trailers.

None of these answers are correct.

A 200 inch wheelbase trailer.

26 / 40

The locking jaws of the kingpin should close around:

the shank

the base

the apex

the tip

27 / 40

With the engine cut off and the brakes released the air loss in a straight truck or bus should not be more than:

4 psi in a minute

3 psi in a minute

5 psi in a minute

2 psi in a minute

28 / 40

A portable tank differs from a cargo tank in that ______.

portable tanks are bulk containers, which are permanently attached to a vehicle

none of these answers are correct

cargo tanks are bulk containers, which are not permanently attached to a vehicle

portable tanks are bulk containers, which are not permanently attached to a vehicle

29 / 40

Select the statement that best describes what the service line is for.

it is controlled by the foot brake or trailer hand brake and carries air

all answers listed

it is controlled by the trailer hand brake and carries air

it is controlled by the foot brake and carries air

30 / 40

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

Division 64

Division 61

Division 63

Division 62

31 / 40

Select the vehicle that off-tracks the most.

a 5-axle tractor that is towing a 45-foot long trailer

a 5-axle tractor that is towing a 32-foot long trailer

a 5-axle tractor that is towing a 40-foot long trailer

a 5-axle tractor that is towing a 52-foot long trailer

32 / 40

Before backing under the trailer after connecting the air lines you should:

have a random pedestrian direct your path of travel

take a walk around the vehicle to make sure it is clear of obstructions

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

double check to make sure the trailer brakes are off

33 / 40

What should you do before you begin to couple?

inspect the condition of the frame of the tractor

check your path for any hazards

position the fifth wheel beforehand

activate the spring brakes

34 / 40

Which of these statements about speed management and braking is true?

You need about four times as much stopping distance at 40 mph as at 20 mph.

The posted speed limit will always allow you to stop safely.

Stopping time increases by one second for each 10 mph over 20 mph.

The total stopping distance of a bus is the distance it takes to stop once the brakes are applied.

35 / 40

What position should the heaviest trailer be in when pulling 3 trailers?

in the middle

in the back

in the front

it makes no difference

36 / 40

Suspension systems:

keep the steering wheel tight

keep the load secure

keep the axles in place

keep the brake drums from failing

37 / 40

Select the reason as to why you should not use the trailer hand valve while driving.

it should not be used on dry roads due to road conditions

it releases too much air from the system

the trailer brakes will not be evenly applied

it could cause the trailer to skid

38 / 40

The most dangerous time during the school bus ride is:

When loading and unloading students.

When the students become unruly on the bus.

Crossing railway crossing.

On long bus journeys.

39 / 40

You should decrease to a safe speed before entering a curve and then_____through it.

shift down 2 gears

pump the brakes

ride the brakes

accelerate

40 / 40

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

take turns slowly

have the brakes properly adjusted

drive while intoxicated

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

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