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Idaho
Idaho CDL Knowledge Test Class B 2
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Q.1
Submit
Without the proper amount of oil in its engine:
A vehicle will have difficulty stopping.
A vehicle will make quick, jerking movements while being driven.
The engine may be quickly damaged.
Q.2
Submit
If planning to stop on the road to unload cargo, you should:
Stop suddenly, since you are already on the road.
Warn other drivers by tapping your brakes.
Wave your arm out the window to get the attention of other drivers.
Q.3
Submit
Your CDL will be revoked if:
You want to add an endorsement.
Your privilege to operate your personal vehicle is revoked.
You have not paid a toll.
Q.4
Submit
If the coolant temperature gauge goes above the highest safe temperature, you should:
Continue to drive.
Pull over and figure out what's wrong.
Run the air conditioner.
Q.5
Submit
Some air brake systems introduce alcohol into the system to:
Make the brakes work without squeaking.
Prevent ice from forming in the brake system.
Prevent people from breathing the air from the system.
Q.6
Submit
Blocking is used to:
Prevent cargo from shifting.
Prevent cargo from being loaded too high.
Prevent cargo from being unloaded too quickly.
Q.7
Submit
When asked to make a lane change during the driving test, you should:
Make the change as soon as the examiner asks, without looking.
Use your turn signal and change lanes when safe.
Make the lane change as quickly as possible, even if that means cutting off another driver.
Q.8
Submit
Mirror adjustment can only be checked properly if:
The trailer is straight.
There is no trailer.
The vehicle is on a slight incline.
Q.9
Submit
Why should the steps of a pre-trip inspection be done in the same order each time?
Because you will be less likely to forget to check something
Because it will be faster
Because it is required by law
Q.10
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When driving at highway speeds, you should watch the road about ____ ahead of your vehicle.
One block
100 yards
A quarter mile
Q.11
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Water that has collected on a roadway can cause:
Hydroplaning.
Acceleration.
Stopping.
Q.12
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If a truck is equipped, a trailer brake hand valve can be used to:
Add fuel to the truck.
Prevent the truck from rolling back when being started from a stop.
Check the engine oil level.
Q.13
Submit
When checking tires, which of the following should not cause concern?
Too much air pressure
Tread of at least 4/32 of an inch on front tires
Radial and bias-ply tires used together
Q.14
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While driving, a driver should:
Not be concerned with what is happening on the sides of their vehicle.
Be concerned with what is happening on all sides of the vehicle.
Not be concerned with what is happening behind the vehicle.
Q.15
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A jogger wearing a stereo headset:
Is probably aware of what is happening around them.
May not be aware of what is happening around them.
Can hear the sounds of traffic.
Q.16
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Why do large vehicles use air brakes?
Other brake systems squeak too loudly.
Air brakes are very effective systems.
Other braking systems are hard to come by.
Q.17
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By beginning a left turn before reaching the center of an intersection, you:
Will likely complete the turn satisfactorily.
May hit other vehicles with the left side of your vehicle.
Can expect other drivers to move their vehicles to accommodate your turn.
Q.18
Submit
Wheels with welding repairs are:
Safe to be used if the repairs were done by a professional.
Safe to be used if the repair seems solid.
Not safe to be used.
Q.19
Submit
Shortly after a tire has been changed, you should:
Stop to make sure the lug nuts are still tight.
Repair the brakes.
Deflate the tire to 10 psi.
Q.20
Submit
The faster you drive:
The shorter your stopping distance will be.
The longer your stopping distance will be.
The easier it will be to stop your vehicle.
Q.21
Submit
If there is a fire in your vehicle and you are not sure how to extinguish it, you should:
Use a fire extinguisher.
Try douse the flames with water.
Move away from the flames and wait for the firefighters.
Q.22
Submit
If making a tight turn, the operator of a CMV should:
Be able to drive as fast as the driver of a car.
Not be concerned about speed, but focus on the road.
Warn drivers behind by braking early and slowing gradually.
Q.23
Submit
A ____ allows a driver to gradually apply spring brakes.
Modulating control valve
Trailer air supply control
Relay valve
Q.24
Submit
To determine if a vehicle can handle a load, you must know:
The vehicle’s suspension rating.
The tire rating for the front tires only.
The tire rating for the rear tires only.
Q.25
Submit
What is the Gross Vehicle Weight Rating (GVWR)?
The weight stated by the manufacturer as the loaded weight of a single vehicle
The maximum weight that can be pulled by a vehicle
The minimum weight that can be hauled by a vehicle
Q.26
Submit
When driving a 50-foot truck at 50 mph, your minimum following distance should be:
Four seconds.
Five seconds.
Six seconds.
Q.27
Submit
Before a trip, you should make sure that:
The brake pedal sticks.
The gas pedal is loose.
The grooved pedal surface has not been smoothed out.
Q.28
Submit
Alcohol is removed from the body:
By exercising.
At a fixed rate.
More quickly if the person stays awake.
Q.29
Submit
When loading a trailer, the heaviest cargo should be placed:
On top of the lightest parts of the cargo.
Under the lightest parts of the cargo.
At the rear of the trailer.
Q.30
Submit
When driving on a wet road, you should reduce your speed by:
About one-half.
About one-third.
About one-quarter.
Q.31
Submit
Alcohol begins to affect the body:
After only one drink.
After several drinks have been consumed.
At the legal limit.
Q.32
Submit
In poor weather, many drivers:
Like to drive in front of trucks.
Like to drive to the sides of trucks.
Like to follow trucks.
Q.33
Submit
Header boards:
Should never be used.
Protect the driver from being hit by cargo.
Protect the driver's head when entering the cab of a truck.
Q.34
Submit
An air compressor governor controls:
When the air compressor pumps air into the air storage tanks.
How fast air is pumped into the air storage tanks.
The temperature of the air pumped into the air storage tanks.
Q.35
Submit
What can happen if the exhaust system is not working properly?
Poisonous fumes may enter the cab.
Fumes may exit the rear of the muffler system.
Proper steering may be impossible.
Q.36
Submit
In a dual air brake system, if one air system is very low on pressure:
None of the brakes will work at all.
Either the front or rear brakes will not be fully operable.
There is usually no noticeable effect.
Q.37
Submit
What is often found in compressed air?
Water
Cardboard
Brake fluid
Q.38
Submit
When loading a trailer, you should:
Place as little weight as possible over the axles.
Place a well-balanced amount of weight over the axles.
Not be concerned with how the weight is distributed.
Q.39
Submit
Escape ramps are ramps that can be used:
Only by automobiles, not trucks.
To leave the highway and enter a two-lane highway.
To stop runaway vehicles on steep downhills.
Q.40
Submit
To avoid a crash:
Braking is always the best option.
Swerving may be more effective than braking.
Drivers should leave 100 yards of distance between their vehicle and the next.
Q.41
Submit
Skids caused by over-acceleration can usually be resolved by:
Removing your foot from the accelerator.
Braking.
Swerving to the right.
Q.42
Submit
If using spring brakes when hauling a heavy load, a complete stop will:
Be impossible.
Take a long time.
Take a short amount of time.
Q.43
Submit
If you are taking the driving test and the route does not include a railroad crossing, you:
Will not have to do anything related to a crossing.
May have to explain how you would cross railroad tracks.
Will have to take a different route.
Q.44
Submit
Your horn should be used to:
Tell other drivers that you are angry.
Warn other drivers that you are near.
Frighten other drivers.
Q.45
Submit
Driving at night is usually:
More difficult than driving during the day.
Simpler than driving during the day.
Discouraged.
Q.46
Submit
Belts in the engine compartment should:
Be frayed.
Not have excessive wear.
Be greasy.
Q.47
Submit
When completing a conventional parallel parking maneuver, you should:
Back up past the parking space, then pull forward into it.
Pull forward past the parking space, then back into it.
Pull forward directly into the parking space.
Q.48
Submit
When should a driver sign a vehicle inspection report?
After every trip
If noted defects are repaired
After each fueling
Q.49
Submit
When checking windshield wiper blades, they should be:
Soft.
Secure.
Brittle.
Q.50
Submit
____ is an example of required emergency equipment.
A spare electrical fuse
A loud horn
A battery-operated flashlight
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