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Indiana CDL DMV Knowledge Test Class B 1

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1. If driving a vehicle with a manual transmission, you can prevent your vehicle from rolling backward when starting from a stop by:
Partly engaging the clutch before removing your foot from the brake pedal.
Placing the vehicle in reverse before moving forward.
Fully engaging the clutch before removing your foot from the brake pedal.
Placing the vehicle in neutral before moving forward.

To prevent rolling backward when starting from a stop, you should partly engage the clutch before removing your foot from the brake. Apply the parking brake whenever necessary to prevent your vehicle from rolling back.

2. When driving under wet conditions, what does a lack of spray from other vehicles indicate?
Ice has formed on the road.
The pavement is dry.
The spray is caught on the underside of the vehicle.
The tires have soaked up all the moisture.

If the road appears to be wet but the wheels of other vehicles are no longer generating spray, ice has formed on the road. Drive with extra caution when operating on wet or icy roads.

3. If your tractor is equipped with ABS but your trailer is not, the ABS:
Will not be effective.
Will still improve your steering control.
Will make jackknifing easier.
Will allow others to see when you brake.

In a tractor-trailer combination, if the tractor is equipped with an Anti-Lock Braking System (ABS) but the trailer is not, the ABS will still improve the driver's steering control. The driver should keep an eye on the trailer and let up on the brakes if the trailer begins to swing out.

4. To ensure normal stopping power, drivers of vehicles equipped with a front brake limiting valve should:
Set the control to normal.
Set the control to the off position.
Set the control to neutral.
Keep the control at the halfway mark.

Some pre-1975 vehicles have a front brake limiting valve, which has "normal" and "slippery" settings. The idea behind these valves was to limit the air pressure available to the front brakes when driving on slippery surfaces, and thereby reduce the danger of a front-wheel skid. Studies have found that this is not actually a concern, so if your vehicle has a front brake limiting valve, leave it in the "normal" position.

5. If required to complete a vehicle inspection report in writing, the report must be signed:
Every day.
Only if defects have been noted and certified to have been repaired.
Only if the repairs are estimated to cost more than $1,000.
Only if requested to do so by a law enforcement officer.

You must sign the previous vehicle inspection report only if defects were noted and certified to have been repaired or not needing to be repaired.

6. Most CDL holders have ____ licenses.

Most CDL holders who drive CMVs in interstate commerce are non-excepted interstate commerce drivers.

7. In an emergency, if you must leave the roadway to drive on the shoulder, you should:
Brake as hard as possible.
Steer so all wheels are on the shoulder.
Stop safely before returning to the road, if possible.
Stay on the shoulder until the next exit.

If a hazard requires you to drive onto the shoulder of a road, you should try to keep one set of wheels on the pavement to maintain better control of your vehicle. If possible, stay on the shoulder until your vehicle has come to a complete stop, then pull back onto the road when it is safe to do so.

8. If using air tanks with manually operated drains, how often should you drain the tanks?
Every day
Once a week
Once a month
Once every six months

In an air brake system with manually operated drains, the tanks should be drained at the end of each day of driving.

9. When you need to brake, how can you warn drivers behind you?
Tap on the brakes a couple of times.
Stick your arm out the window.
Swerve within your lane.
Change lanes.

To warn drivers behind you that you are about to slow down, it may be a good idea to first lightly tap your brake pedal a few times to make the brake lights flash.

10. When you must travel down a grade, when should you switch into a lower gear?
Before beginning the grade
After you have already started the grade
As far down the grade as possible
At the bottom of the grade

Before starting down a hill, you should shift into a lower gear. This will help get your vehicle to a speed that you can control without having to use your brakes too much.

11. When approaching a vehicle for a pre-trip inspection, a driver should look under the vehicle:
To see if the vehicle is on an incline.
To see if there are any fresh fluids under the vehicle.
To see if the vehicle is in a parking spot.
To see if the vehicle is on a decline.

When approaching your vehicle to conduct an inspection, you should look underneath it to make sure there are no fresh oil, coolant, grease, or fuel leaks on the ground. Leaks can indicate unsafe defects on a vehicle.

12. The brake pedal is part of which braking system?
The service brake system
The parking brake system
The emergency brake system
The auxiliary brake system

The service brake system applies and releases the brakes when a driver presses the brake pedal while driving normally.

13. Emergency brakes:
Are not required on trucks.
Are only required on trailers.
Are required on tractors.
Are optional.

All trucks, truck tractors, and buses must be equipped with emergency brakes and parking brakes. These brakes must be held by mechanical force.

14. Why are roads particularly slippery right after it begins to rain?
Water mixes with grease and oil on the road.
Roads are naturally slippery.
Gravel gets washed to the middle of the lane.
Some tires are not designed for rain.

Roads are often at their most slippery when rain is just beginning to fall. This is because water mixes with oil and grease on the road to create a slick surface. As rain continues, the oil and grease will wash away.

15. A high center of gravity:
Makes a vehicle more susceptible to rollover.
Is encouraged in inclement weather.
Is required on some roads.
Improves fuel efficiency.

A high center of gravity makes a vehicle more likely to tip over.

16. When trying to put out an electrical fire:
Use water.
Use a B or C extinguisher.
Use an X extinguisher.
Use a Q extinguisher.

B and C type fire extinguishers are designed to work on electrical fires. Water should never be used to extinguish an electrical fire because doing so could result in an electrical shock.

17. If you must drive in reverse, it is helpful to:
Drive as fast as possible and get it over with.
First exit the truck and walk the path to look for obstacles.
Use only the passenger side mirror.
Stick your head out the window and look backward.

If you must drive in reverse, you should first walk around the vehicle to check for hazards in your path of travel. Make frequent use of the mirrors on both sides of your vehicle while backing. Always back up as slowly as possible.

18. When backing with a trailer:
You should not back up in a straight line.
You should not correct drift until you are very far off course.
You should pull up to reposition the vehicle as needed.
You should avoid braking.

When backing with a trailer, you should pull up to reposition your vehicle as needed.

19. During the vehicle inspection test, you will be required to do all of the following, except:
Walk around the vehicle.
Point to or touch each item.
Explain what you are checking and why.
Crawl under the vehicle.

As a part of earning your CDL, you will have to pass an inspection test and demonstrate that your vehicle is safe for operation. During the vehicle inspection test, you will have to walk around the vehicle and point to or touch each item and explain to the examiner what you are checking and why. You will not have to crawl under the hood or under the vehicle.

20. When only the tractor is equipped with an Anti-Lock Braking System (ABS):
There is a decreased risk of jackknifing.
There is an increased risk of jackknifing.
The brakes will not work as effectively as they would without ABS.
The brakes will become more sensitive.

If a tractor is equipped with an Anti-Lock Braking System (ABS) but the trailer is not, the risk of jackknifing will be reduced and the driver should still be able to maintain steering control. If only the trailer is equipped with ABS, it is less likely that the trailer will swing out to one side.

21. On a leaf spring, the leaves:
May be broken.
Are not required.
Should not be broken.
Should shift.

When inspecting a vehicle's suspension, you should look for broken or missing leaves in the leaf springs. Any defect of this kind is dangerous. If one-fourth or more of the leaves are missing from any leaf spring, the vehicle must be put out-of-service.

22. When changing lanes, you should not:
Use your turn signal.
Check your mirrors.
Check your blind spot.
Expect other drivers to clear your path.

Before changing lanes, check your mirrors to make sure you have enough space to safely move. After activating the appropriate turn signal, check again to see if anyone has moved into your blind spot. After you begin to change lanes, check once more to verify that your path is still clear.

23. When driving down a steep grade, your brakes may fade. What happens if brakes fade?
They become quieter.
They become less effective.
They work better than usual.
They work differently from front to back.

If you use your brakes too much when traveling on a steep downgrade, they may overheat and become less effective. To avoid causing your brakes to overheat on a steep hill, you should rely on engine braking.

24. When covering cargo, a cover that flaps in transit:
Is acceptable.
Allows air to get to the cargo to keep it cool.
Can tear away.
Can attract birds.

If cargo is covered, the cover should not flap in the wind in transit. The cover could tear loose, uncovering the cargo while potentially blocking your view or the view of others.

25. When using a fire extinguisher on a fire, you should:
Get as close to the fire as possible.
Stay as far away from the fire as possible.
Aim the extinguisher at the top of the flames.
Aim the fire extinguisher at the ground about two feet away from the fire.

When using a fire extinguisher, you should stay as far away from the flames as possible and aim at the base of the fire.

26. Failing to exit your vehicle properly during an exercise in the basic vehicle control skills test will result in:
Failure of only that exercise.
A reset of that exercise.
Automatic failure of the basic vehicle control skills test.
An extra point against your score.

When exiting your vehicle during the basic vehicle control skills test, you must face the vehicle and maintain three points of contact at all times. If your testing vehicle is a bus, you must maintain contact with the handrail. Exiting the vehicle incorrectly may result in automatic failure of the basic control skills test.

27. When driving on the expressway during the skills test, you should:
Switch lanes frequently.
Use your mirrors to check traffic as needed.
Drive on the left side of the lane.
Drive above the posted speed limit.

During the on-road driving skills test, you may be asked to drive on an expressway. Make sure you maintain proper lane positioning, vehicle spacing, and vehicle speed. Continue to thoroughly check traffic in all directions while on the expressway.

28. The air entering air storage tanks may contain:
Water and compressor oil.

The air that enters air storage tanks in an air brake system usually contains a certain amount of water and compressor oil. Because accumulations of these materials can damage the braking system, tanks are equipped with drains to allow their removal.

29. When doing an inspection, ensure that the brake pads are:
Covered with grease.
Covered with coolant.
Covered with oil.
Free of oil or grease.

When inspecting a vehicle's brakes, you should make sure the shoes and pads do not have oil, grease, or brake fluid on them.

30. Rough acceleration:
Can damage a vehicle.
Is necessary to warm up parts of the engine.
Is encouraged to improve gas mileage.
Should be done on surfaces with poor traction.

Accelerate smoothly and gradually. Rough acceleration can cause mechanical damage.

31. A cargo cover that flaps while you are driving:
Is acceptable.
Allows air to keep the cargo cool.
Can tear away.
Can attract birds.

If cargo is covered, the cover should not flap in the wind in transit. The cover could tear loose, uncovering the cargo while potentially blocking your view or the view of others.

32. In an emergency situation, you should:
Always respond by stopping.
Not always respond by stopping.
Never respond by swerving.
Always turn on your flashers to warn other drivers.

Stopping is not always the safest option when responding to an emergency while driving. It is usually safer to steer out of the way when attempting to avoid a crash.

33. Bridges usually:
Freeze, but only once the temperature drops significantly below 32 degrees Fahrenheit.
Freeze after other road surfaces freeze.
Freeze before other road surfaces.
Have heaters to prevent them from freezing.

Bridges usually freeze before the rest of the road. You should be especially careful when crossing bridges if the temperature is near the freezing point.

34. An air compressor governor will stop the compressor from pumping air once the air tanks have an air pressure level of:
125 psi.
100 psi.
150 psi.
80 psi.

An air compressor governor will stop the compressor from pumping air once the air tanks are at an air pressure level of 125 psi. This air pressure level is referred to as the "cut-out" level.

35. Texting while driving a CMV is:
Acceptable if the text is work-related.
Acceptable if there are fewer than 10 words in the text message.
Encouraged because it is safer than talking on the phone.

Texting while driving a commercial motor vehicle is both illegal and dangerous. Manually entering text into or reading text from any electronic device is considered texting.

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