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

How much space should there be between the lower and upper fifth wheel?

1 to 2 inches

it is dependent on the load you are carrying

zero

1/4 to 1/2 of an inch

2 / 40

Which of the following are some suspension system defects?

leaking shock absorbers

broken leaves in leaf spring

cracked or broken spring hangers

all of these answers are correct

3 / 40

Surge affects the handling of a tanker by:

None of the answers listed.

Allowing you to take tighter turns.

Increasing the wind drag.

Moving the truck in the direction the liquid flows in.

4 / 40

What does it mean when the safety valve releases air?

there is too much air in the air compressor

pressure has passed 150 psi

all of these answers are correct

you need it to have it checked out by a mechanic because something is wrong

5 / 40

On a drawbridge, you do not need to stop, but must slow down and make sure it's safe, when:

None of these answers are correct.

There is a traffic light showing green.

Both of these answers are correct.

The bridge has an attendant or traffic officer who controls traffic whenever the bridge opens.

6 / 40

These tires should have a minimum tread depth of 4/32 inches.

Drive axle tires

Donut tires

Non-steering axle tires

Steering axle tires

7 / 40

How far away are you required to park from a bridge, tunnel, or building if you are carrying Division 1.2 or 1.3 materials?

At least 600 feet

At least 500 feet

At least 300 feet

At least 400 feet

8 / 40

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

the one-way check vavle

the tractor relay valve

the engine protection valve

the air compressor

9 / 40

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

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

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

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

none of these answers are correct

10 / 40

To find out if a shipment includes a hazardous material, you should:

Look at the shipping papers.

Check for a fence around the loading dock.

Ask the driver.

Open and inspect every package and container.

11 / 40

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

only in ideal conditions

only on downgrades

false

true

12 / 40

Select the true statement in regards to if a glad hand on the blue air line is missing a seal.

you should remove one from the red air line to use as a temporary replacement

it is not a big problem

there may be an emergency line air leak

there may be a service line air leak

13 / 40

Select the true statement in regards to what the fifth wheel should be checked for.

if there is any missing or damaged parts

all answers listed

if the jaws are open

if it is properly greased

14 / 40

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

only at the end of the shift

only every 7 days

yes

15 / 40

While completing the 1st component of the air brake check you are required to fully push down on the foot brake and _____.

none of the answers listed

both of the answers listed

see if the air pressure drops more than 4 lbs in a minute while holding it down for a full minute in a combination vehicle

see if the air pressure drops more than 3 lbs in a minute while holding it down for that full minute in a single vehicle

16 / 40

What color and shape is the trailer air supply control?

it is a triangle-shaped knob that is red

it is an 8-sided knob that is red

it is a square knob that is yellow

it is a square knob that is red

17 / 40

Select which is not an engine compartement belt:

A water pump belt

An air compressor belt

A power steering belt

A safety belt

18 / 40

Why are you required to take an exam about air brakes?

all trucks have air brakes

it is a federal requirement

you would have to get a CDL with a restriction otherwise

you cannot receive a CDL at all otherwise

19 / 40

The CDL manual indicates the last step on picking up students at the bus stop is as follows:

Place transmission in park or neutral and set parking brake.

Activate the amber flashing caution lights to warn vehicles that the bus will stop to load passengers soon.

Make a final check to confirm all traffic stops before opening the bus door and signaling students to approach.

Open the service door just enough to activate the alternating red light when traffic is in a safe distance from the bus.

20 / 40

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

Small-arms ammunition.

Properly secured tear gas canisters.

Materials labeled radioactive in the space occupied by people.

Properly labeled poison gas canisters.

21 / 40

Select the true statement in regards to handing triples and doubles

a sudden movement of the steering wheel may result in the rear trailer tipping over

due to off tracking, a triple bottom rig can come to a stop quicker than a 5 axle semi trailer

none of the answers listed

due to the crack the whip effect, the rear trailer of a 100 foot triple is less likely to tip than a single trailer

22 / 40

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

Any stop the bus makes.

Sharp turns.

Busy intersection.

Stop to load or unload students.

23 / 40

You should be in the proper gear before going down a hill because:

water may build up in the air tanks if you do not rely on the engine brake

it helps control your speed better

it builds up the air pressure in the air tanks

brakes may fail or fade from excessive heat due to relying on them too much and not using the engine brake effect

24 / 40

This item does not need to be checked during the cab check.

The defroster/heater

The windshield wipers and fluid levels

The horn

The air conditioning

25 / 40

What must vehicles with air brakes have?

an air pressure gauge that shows how much air is used by the brake chambers for braking

an air pressure gauge that shows the pressure available for braking

a minimum of 2 air tanks

all of these answers are correct

26 / 40

Which of the following would NOT be part of a standard vehicle inspection?

tire problems

seating defects

bad brake drums or shoes

steering system defects

27 / 40

Check to ensure that____when inspecting the coupling.

the landing gear handle is free to hang down

the electrical cable is unplugged

there is minimal slack in the air lines

there is no slack at all in the air lines

28 / 40

You should turn off your engine when loading flammable liquid unless:

You need the engine to run the pump.

The material does not need a placard.

You are loading at night and need the headlights.

You are a non-smoker.

29 / 40

Drivers who transport route controlled radioactive materials must carry a dated certificate of radioactive materials training. This training must have ocurred within the last:

4 years

2 years

1 years

3 years

30 / 40

Select the part that is not a part of the drum brake:

brake drum

slack adjuster

axle

safety valve

31 / 40

A truck with baffles will handle:

Heavier that it actually is.

The same as a tanker with no baffles.

With less front to back surge compared to trailers without baffles.

None of the answers listed.

32 / 40

Most states require school bus drivers to take a physical examination:

Twice per year

Every 3 years

Annually

Every 2 years

33 / 40

What is most likely to occur when driving a tanker truck and the front wheels begin to skid?

Nothing will occur.

No matter how you steer, you will continue in a straight line.

The tank will roll over.

The surge will disconnect the tank from the truck.

34 / 40

Which of the following statements about bus evacuation is true?

If time allows, notify the dispatcher about evacuation location, conditions, and type of assistance needed.

If time allows, walk through the bus and close all windows.

If time allows, backup to the stop before evacuating the bus.

If time allows, notify the police.

35 / 40

A shipment described on the Hazardous Waste Manifest may only be delivered to another _______ carrier or treatment facility, who then signs the ______, giving you a copy which you must keep.

registered, uniform hazardous waste manifest

responsible, papers

trucking, uniform hazardous waste manifest

licensed, manifest

36 / 40

What are slack adjusters?

they are between the push rod on disc brakes and power screw

all of these answers are correct

they are a part of the air brake system that adjusts the brakes

they are between the S-Cam on drum brakes and the push rod

37 / 40

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

it stays about the same

it increases by four times

it increases by two times

none of these answers are correct answers are correct

38 / 40

You may use DANGEROUS placards instead of separate placards for each Table 2 hazard class when:

You have 1,001 pounds or more of two or more table 2 hazard classes, requiring different placards.

You have not loaded 2,205 pounds or more of any table 2 hazard class material at any one place (you must use the specific placard for this material).

The correct answer is not listed.

Both of these conditions must be met.

39 / 40

Select the statement that describes smooth bore tanks:

They are divided down into smaller tanks.

They are 1 large tank.

They are divided with holes from liquid to flow through controlling surge.

None of the answers listed.

40 / 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 a normal pressure

at half of its normal pressure

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