Commercial Drivers License (General Knowledge) : Commercial Drivers License (General Knowledge)

Study concepts, example questions & explanations for Commercial Drivers License (General Knowledge)

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Example Questions

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Example Question #1 : Safety Practices

If your vehicle has been involved in an accident, the best way to help prevent another accident as cars pass the site is to _____________.

Possible Answers:

Leave your vehicle and seek the high ground to wave at coming cars

Run, as far and as fast as your legs will carry you

Sit still in the cab of your vehicle

Put out highly visible warning flags, markers, or devices on the road for passing cars to see

Correct answer:

Put out highly visible warning flags, markers, or devices on the road for passing cars to see

Explanation:

The best thing to do is, rather obviously, to place markers on the road to help other cars avoid running into the accident site. Leaving the car and signaling with your arms is nowhere near as efficient as a highly visible, and well-placed marker.

Example Question #1 : Safety

In judging the safe speed on a deep downgrade, one must consider all of the following except ________________.

Possible Answers:

how heavy the vehicle and cargo are combined

the quality and condition of the road

how fragile the cargo inside the vehicle is

how steep the grade is

Correct answer:

how fragile the cargo inside the vehicle is

Explanation:

In assessing your safe speed on a downgrade, your primary concern must be the safety of yourself and the other drivers or pedestrians nearby. The fragile nature of your cargo is far from the greatest concern, as compared to safe travel for all humans involved or nearby.

Example Question #2 : Safety

A hazard is ________________.

Possible Answers:

not a relevant term related to commercial vehicle safety

any road condition or driver that could potentially cause danger

a term for materials that are toxic or flammable

a road condition that could potentially cause danger

Correct answer:

any road condition or driver that could potentially cause danger

Explanation:

Hazard is a broad term that refers to any road condition or driver that could potentially cause danger. Hazardous materials are toxic or flammable. A patch of ice and a drunk driver are both considered hazards, by this definition.

Example Question #1 : Hazards

Which of the following is the most common cause of tire fires?

Possible Answers:

Tires that are over-inflated

Tires that are made with a deficient grade of rubber

None of these

Tires that are insufficiently inflated

Correct answer:

Tires that are insufficiently inflated

Explanation:

Under-inflated tires are the single most common cause of tire fires, especially for heavy and commercial vehicles. Over-inflated tires, while posing obvious safety concerns, do not pose as great a risk for fires specifically as do under inflated tires.

Example Question #1 : Alcohol, Other Drugs, And Driving

Which of the following is the most reliable method for someone who has consumed alcohol to regain sobriety?

Possible Answers:

Drinking several glasses of water

Drinking one cup of coffee per serving of alcohol you consume

The passage of time

Taking a brisk walk

Correct answer:

The passage of time

Explanation:

While some of the other methods may be considered anecdotally useful, BUT in the eyes of the law (and the BAC counter), the only foolproof method of sobering up is simply to wait an appropriate amount of time.

Example Question #4 : Commercial Drivers License (General Knowledge)

What is the minimum number of tiedowns for a 20-foot load?

Possible Answers:

2

4

1

5

Correct answer:

2

Explanation:

This is a simple rule knowledge question. The rule is 1 tiedown per 10 feet, in all cases.

Example Question #3 : Safety

Under which of the following conditions is it safe to remove the radiator cap on your vehicle?

Possible Answers:

The radiator is undamaged and the engine is warm

The engine is not overheated, but the engine has been in recent use

The entire engine system is completely cooled

None of these; the radiator cap should never be removed

Correct answer:

The entire engine system is completely cooled

Explanation:

In order for it to be remotely safe to remove your radiator cap, the entire engine system must be completely cooled. Even in that condition, removing the radiator cap should be only be done with extreme caution.

Example Question #6 : Commercial Drivers License (General Knowledge)

In order to correctly and safely shift gears, you should NOT _________________.

Possible Answers:

release the clutch

accelerate before initially pressing in the clutch

shift into a higher gear while pushing in the clutch

accelerate while releasing the clutch

Correct answer:

accelerate before initially pressing in the clutch

Explanation:

The basics of shifting gears are as follows: release the accelerator, push the clutch, shift into neutral, release the clutch, let the engine and gears slow sufficiently, then push in the clutch and shift into the appropriate higher gear, release the clutch and LAST press the accelerator. Pressing your accelerator should always be the last step in this process.

Example Question #1 : Defensive Driving Techniques

Stopping distance is _________________.

Possible Answers:

the sum total of the perception and braking distance

the same thing as perception distance

the same thing as braking distance

the sum total of the perception, reaction, and braking distances

Correct answer:

the sum total of the perception, reaction, and braking distances

Explanation:

This is a simple definition question. Stopping distance is the combination of all the stopping related distances, perception, reaction, and braking.

Example Question #4 : Safety

If, on a clear and dark winter's evening, you are driving, and the temperature suddenly drops far below freezing, about which of the following areas should you be most cautious?

Possible Answers:

A bridge

Clear, open highway

None of these

The middle of your lane of traffic

Correct answer:

A bridge

Explanation:

Once the temperature dips below freezing, you should just become generally more cautious/vigilant for slippery areas of the road. But, the MOST dangerous area of the ones listed is clearly bridges, which are among the first areas of the road to gather thin slippery layers of ice.

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