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

Never refuel your bus:

Without a static chain.

In a closed building with passengers on board.

With any of the windows open.

With a higher grade of fuel.

2 / 40

The container for the mechanism that transforms the steering column action into wheel action is:

Air brake system

Steering linkage

Locking pin

Steering hoses/box

3 / 40

How much space should you see between the lower and upper fifth wheel when checking the coupling of a converter dolly?

none

1/2 to 1 inch

1 to 1 1/2 inches

it depends on how heavy the load is

4 / 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

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

none of the answers listed

5 / 40

The main reason you should pull the dolly out from under a trailer before disconnecting it from the trailer in front is:

to provide additional lateral stabilization to the front trailer

so the rear-trailer's air brake system will stay charged and keep the trailer wheels locked to prevent rolling

it is possible that the dolly tow bar could fly up making it difficult to re-couple

removing the dolly before uncoupling is not the correct procedure

6 / 40

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

ride the brakes

shift down 2 gears

accelerate

pump the brakes

7 / 40

What are spring brakes?

all of these answers are correct

they are brakes that automatically come on for a truck or trailer when the psi drops too low

they are powerful springs that hold back air pressure when driving

they do not function when the psi falls below 30 psi

8 / 40

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

it stays about the same

it increases by four times

none of these answers are correct answers are correct

it increases by two times

9 / 40

What is the most important reason for doing a vehicle inspection?

federal and state laws require you to inspect your vehicle

safety for yourself and other road users

to insure that you will achieve the best gas mileage

to save you money by preventing costly repairs

10 / 40

It takes special care to drive tankers with liquid in them because:

The low center of gravity of the load.

The movement of the liquid even when the truck is stopped.

The baffles create odd rocking motions.

The high center of gravity of the load.

11 / 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

5 psi in a minute

2 psi in a minute

3 psi in a minute

12 / 40

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

are illegal in most states

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

make things look closer and larger than they actually are

13 / 40

You should_____when the low pressure warning is activated:

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

pump the brake pedal to come to a stop immediately

wait until the air brakes kick in automatically

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

14 / 40

While completing the 2nd component of the air brake check you are required to turn the electrical power on, begin fanning off the air pressure by rapidly relasing and apply the foot brake and _____.

none of the answers listed

the tractor protection valve and parking brake valve should pop out before air pressure falls below 60 psi for combination vehicles

a low air warning device should sound before the air pressure drops below 40 psi

a low air warning device should sound before the air pressure drops below 60 psi

15 / 40

Select the false statement about tractor protection valves.

should the trailer air leak, it keeps the air in the tractor

if the air pressure is low it will automatically close

the trailer air supply valve in the cab controls it

air is allowed to leak from the tractor line when it is closed

16 / 40

When you have a major leak in the service line and put on the brake, the service air pressure will escape and cause the:

the trailer emergency brakes to activate

none of the ansers listed

the tractor spring brakes to activate

the trailer tank pressure to decrease

17 / 40

Select the factors that can cause your brakes to fade or fail:

using the service brakes excessively

the brakes are out of adjustment

not relying on engine braking enough

all of these answers are correct

18 / 40

What do you check when doing a visual inspection of the coupling?

none of the answers listed

the locking jaw is closed around the kingpin and there is no space beween the lower and upper fifth wheel

that the locking jaw is closed around the kingpin and that there is no space between the upper and lower fifth wheel

that the locking jaw is open around the kingpin and that there is some space between the lower and upper fifth wheel

19 / 40

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

5 seconds

6 seconds

7 seconds

8 seconds

20 / 40

Which of the following answers lists the three types of emergency equipment you must have on your bus?

Repair kit, spare electric fuses (unless equipped with circuit breakers), and fire extinguisher.

Fire extinguisher, spare electrical fuses (unless equipped with circuit breakers), and emergency reflectors.

Emergency reflectors, fire extinguisher, signal flares and tire repair kit.

Hydraulic jack, fire extinguisher, signal flares.

21 / 40

If you are driving a 100-foot truck with double trailers at 30 mph in dry conditions, how many seconds of space should there be between your truck and other vehicles?

22 / 40

Who is responsible for packaging, labeling, and preparing the hazardous material shipping papers for a common carrier?

The carrier

The shipper

Your spouse

The driver

23 / 40

Select the answer that is controlled by the foot brake.

the service air line

the emergency brake

the engine brake

the shut off valves

24 / 40

Select the action that is not appropriate when driving on slippery roads:

none of the answers listed

avoid having traffic in your side space

use a light pressure on the brake and accelerator pedals

use a speed retarder or engine brake

25 / 40

When would a drive-wheel skid result in a jackknife when pulling doubles?

when the tractor spins around

when the trailer slides to the right into the shoulder

when the tractor brakes lock up

when the trailer pushes the towed vehicle sideways

26 / 40

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

There is a traffic light showing green.

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

None of these answers are correct.

Both of these answers are correct.

27 / 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.

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

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.

28 / 40

How often should you check your cargo?

all of these answers are correct

after every break you take during driving

within the first 50 miles after beginning a trip

every 150 miles or every three hours

29 / 40

You do not have to stop at railroad crossings, but must slow down and carefully check for other vehicles:

Where a policeman or flagman is directing traffic.

At crossings marked as "exempt" or "abandoned".

All of these answers are correct.

If a traffic signal is green.

30 / 40

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

pull hard on each slack adjuster while wearing gloves

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

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

pull on the slack adjuster while the parking brakes are on

31 / 40

When this item is missing or loose, movement may occur between the fifth wheel assembly and the frame.

Tandem release arm

Locking pins

Lug nuts

Locking jaw

32 / 40

With the controlled braking method, you _____?

apply the brakes all the way until the wheels lock up, release the brakes and apply them again when the wheels start to roll again

repeatedly tap the brakes as fast as you can

apply the brakes as hard as you can without locking the wheels

lightly apply braking pressure

33 / 40

This object should be free of shiny treads, rust, free of cracks and distortions.

Bolt spacers

Lug nuts

None of the answers listed

Rims

34 / 40

You should check that the _____are secure, caps are on tight, and is not leaking.

none of the answers listed

cb radio

fuel tanks

coolant system

35 / 40

With Division 1.1, 1.2, or 1.3 Class A or B, how close can you park to a bridge, tunnel, or building?

Do not park within 300 feet.

Do not park within 200 feet.

Do not park within 500 feet.

Do not park within 100 feet.

36 / 40

Which of the following should you do when confronted by an aggressive driver?

all of these answers are correct

avoid eye contact

ignore rude gestures and refuse to react negatively

if you can safely do it, call the police from a cell phone

37 / 40

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

Larger / heavier vehicles generally take longer to stop.

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

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

All answers listed.

38 / 40

You should check your tires every ____ or every ____ when driving in very hot weather.

1 hour, 50 miles

5 hours, 250 miles

2 hours, 100 miles

3 hours, 200 miles

39 / 40

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

there is an equal chance for trailers to tip

false

true

trailers never tip

40 / 40

What does the service brake system do?

they are valves that maintain air tank pressure

they are part of an official vehicle inspection

under normal driving it applies and releases the brakes by using the brake pedal

they are only on vehicles that have hydraulic brakes

Your score is

The average score is 0%

5/5 - (2 votes)

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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