Cab Controls and Instruments - ONLINE CDL SCHOOL

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Cab Controls and Instruments

Build confidence with 10 original questions about Cab Controls and Instruments. Review your answers and explanations after finishing.

Supplemental study practice. This is not a government licensing exam or ELDT certification, and does not replace hands-on training. Follow your state’s current handbook.

1 / 10

During your pre-trip inspection, you activate the windshield wipers and notice they move unevenly and leave streaks. What should you do?

Ignore it if visibility is currently good

Replace or repair the wipers before driving

Only use the wipers when it rains

Drive slower if it starts to rain

2 / 10

After starting the engine, you notice the oil pressure gauge does not rise to normal within a few seconds. What should you do?

Shut off the engine and investigate the problem

Continue driving and check again later

Ignore it if the temperature is low

Rev the engine to increase pressure

3 / 10

While checking the cab controls, you find that the horn does not work. What should you do?

Continue driving and report it later

Get it repaired before driving

Ignore it if you don't use the horn often

Only use hand signals instead

4 / 10

You are preparing for a trip and notice several loose papers and a coffee mug on the dashboard. What should you do before starting the engine?

Secure all loose items in the cab

Put them on the passenger seat

Leave them as they are

Throw them out the window

5 / 10

You are checking the heater and defroster controls before a winter trip. What is the correct procedure?

Assume they work if the engine is running

Operate the controls to ensure they work properly

Only check the heater, not the defroster

Check them only if you see frost on the windshield

6 / 10

You are performing a service brake check. What should you look for when applying the brakes at 5 mph?

The steering wheel should vibrate

The vehicle should slow down gradually without stopping

The vehicle should not pull to either side and should stop smoothly

The brakes should squeak loudly

7 / 10

You are about to start the engine for your pre-trip inspection. What must you ensure regarding the gearshift?

It is in neutral or 'park' if automatic

It is in any gear

It is in first gear

It is in reverse

8 / 10

You are checking the parking brake. What is the correct way to test if it holds the vehicle?

Check the parking brake light only

Release the parking brake and try to move

Push the brake pedal while parked

Gently pull forward with the parking brake engaged

9 / 10

While inspecting the cab, you notice the turn signal indicator does not light up when activated. What should you do?

Ignore it if you plan to drive straight

Check it again after your trip

Repair the turn signal before driving

Use hand signals only

10 / 10

During your inspection, you notice the ABS warning light stays on after starting the engine. What does this indicate?

The ABS is not working properly and needs attention

The brakes are fully charged

The battery is low

The engine is cold

Your score is

The average score is 0%

About the Cab Controls and Instruments practice quiz

This practice quiz focuses on Cab Controls and Instruments, listed under CDL Practice — Pre-Trip Inspection. Use it to check what you understand, spot topics to revisit, and connect the material to safe, informed decisions on the road.

Before you begin

Keep your current CDL manual or course notes nearby. Read each prompt carefully and think through why an answer fits, especially when a question describes a vehicle, road, or workplace situation. Licensing rules and procedures can vary, so confirm requirements with current official materials for your state.

After you finish

Review any explanations shown with your results. Note unfamiliar terms or missed concepts, then revisit your manual or course notes before trying again. Use your score to guide study; understanding why an answer is correct matters more than the number alone.

Study note: These quizzes are independent study practice. They are not state licensing exams, official government materials, or ELDT certification, and they do not replace required training.

Explore CDL Tests to find more practice by subject.