Engine Compartment - ONLINE CDL SCHOOL

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Engine Compartment

Build confidence with 10 original questions about Engine Compartment. 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

While inspecting the engine compartment, you notice the battery connections are loose. What is the proper response?

Only tighten if the battery is low

Tighten the battery connections before driving

Disconnect the battery and continue

Ignore it if the vehicle starts

2 / 10

If your vehicle is equipped with power steering, what should you check in the engine compartment?

Power steering fluid level and hose condition

Nothing, as it is checked inside the cab

Just the fluid color

Only the power steering belt

3 / 10

You notice the windshield washer fluid reservoir is empty during your engine compartment check. What should you do?

Only fill if the windshield is dirty

Check it again after the trip

Refill the reservoir before driving

Ignore it if rain is not expected

4 / 10

When checking belts in the engine compartment, what should you look for?

Only the color of the belts

If the belt is made of rubber

Tightness and excessive wear

If the belt is oily

5 / 10

Before opening the hood or engine compartment door, what must you ensure?

Transmission is in gear

Headlights are on

Engine is running

Parking brakes are on and/or wheels are chocked

6 / 10

During your pre-trip inspection, you find that the engine oil level is below the ‘add’ mark on the dipstick. What is the correct action?

Start the engine and recheck the level later

Ignore it if the oil looks clean

Add oil until it reaches between the 'add' and 'full' marks

Only add oil if the engine is running

7 / 10

If you find a cracked or missing light lens on the front of your vehicle during inspection, what should you do?

Only report it if both lenses are damaged

Cover the lens with tape and continue

Replace or repair the lens before driving

Ignore it if the bulb still works

8 / 10

If you see electrical wires in the engine compartment with worn insulation, what is the correct action?

Wrap the wires with tape and continue

Ignore if the wires are not touching anything

Repair or replace the wiring before driving

Only report if the wires are broken

9 / 10

While inspecting the engine compartment before starting your trip, you notice a puddle of green fluid under the engine. What should you do next?

Start the engine to see if the leak stops

Check for coolant leaks and inspect hoses for damage

Ignore it if the fluid is not oil

Add more coolant without checking for leaks

10 / 10

You are checking the engine compartment and see a hose with visible cracks. What should you do?

Only replace if the crack is leaking fluid

Replace the hose before operating the vehicle

Ignore it if it is not leaking

Wrap the hose with tape and continue

Your score is

The average score is 0%

About the Engine Compartment practice quiz

This practice quiz focuses on Engine Compartment, 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.