California Commercial Drivers License Exam

California Commercial Driver’s License Exam (CDL) Exam Questions And Correct Answers (Verified Answers) Plus Rationale Q&A | Instant Download Pdf

• What is the minimum tread depth for front tires on a commercial vehicle?
• 2/32 inch
• 4/32 inch
• 6/32 inch
• 3/32 inch

Front tires must have at least 4/32 inch tread depth to ensure sufficient traction and safety.

• Which of the following should be part of your pre-trip inspection?
• Checking the air freshener
• Ensuring all lights are working properly
• Verifying the air conditioning setting
• Checking personal belongings

Lights are a critical safety component and must be working properly before driving.

3. When driving a commercial vehicle downhill, you should:

• Shift into neutral
• Use the foot brake only 1 / 3

• Use a lower gear and engine braking
• Rely on cruise control

Engine braking helps control speed and prevents brake overheating on declines.

• What is the correct method to test for hydraulic brake leaks?
• Pump the brake pedal repeatedly
• Press the accelerator
• Press the brake and hold it for five seconds
• Disconnect the brake line

Holding the pedal helps detect whether pressure drops, indicating a leak.

• How often should cargo be inspected?
• Every 8 hours
• Only before starting the trip
• Within the first 50 miles and every 150 miles or 3 hours
• Only when stopped by law enforcement

Cargo shifts can cause accidents; regular checks are required by federal law.

6. When using a fire extinguisher, you should:

• Aim at the top of the flames
• Stand as close to the fire as possible
• Aim at the base of the fire
• Use it only after the fire department arrives

The base is the fuel source of the fire—extinguishing it stops the fire.

• Which of the following is true about backing a commercial vehicle? 2 / 3

• Use a helper whenever possible
• Back quickly to minimize time in reverse
• Turn off all mirrors
• Avoid using flashers

Helpers help guide the driver and prevent blind-spot accidents.

8. The purpose of a vehicle inspection report is to:

• Complain about management
• Track fuel mileage
• Monitor personal behavior
• Identify defects before operation

Pre- and post-trip inspections prevent mechanical failure on the road.

• If you are driving at 55 mph, what is your approximate stopping distance?
• 100 feet
• 200 feet
• About 400 feet
• Over 1,000 feet

At 55 mph, it takes about 400 feet to stop, including reaction and braking distance.

• Which statement about overhead clearances is true?
• All bridges are marked with clearance heights
• Your load does not affect clearance
• Warning signs may be lower than actual clearance
• Heights never change

Signs are sometimes conservative; always verify with your load height.

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