CDL Practice Tests: Pre-Trip Inspection

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Question #511 (1 of 10)

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When doing an air brake system leak check, how long do you hold the pedal and what do you check for?

  • Hold the pedal for two minutes. Check the air gauge to see if the air pressure drops more than 1 pound in one minute (single vehicle) or 2 pounds in one minute (combination vehicle)
  • Hold the pedal for one minute. Check the air gauge to see if the air pressure drops more than 3 pounds in one minute (single vehicle) or 4 pounds in one minute (combination vehicle)
  • Hold the pedal for 10 seconds. Check the air gauge to see if the air pressure drops more than 3 pounds in one minute (single vehicle) or 4 pounds in one minute (combination vehicle)
  • Hold the pedal for one minute. Check the air gauge to see if the air pressure drops more than 6 pounds in one minute (single vehicle) or 8 pounds in one minute (combination vehicle)
System Leak Check. With the air pressure built up to the governor cut-off (120-140 psi), shut off the engine, chock your wheels, (if necessary), release the tractor parking valve and trailer parking valve (combination vehicles), fully apply the foot brake and hold it for one minute. Check the air gauge to see if the air pressure drops more than 3 pounds in one minute (single vehicle) or 4 pounds in one minute (combination vehicle).
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Question #517 (2 of 10)

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When checking the steering box components under the hood, what should you check for?

  • Check for power steering fluid leaks or damage to power steering hoses
  • Check that the steering box is securely mounted and not leaking
  • Look for any missing nuts, bolts and cotter keys
  • All these are correct

Steering Box/Hoses

  • Check that the steering box is securely mounted and not leaking. Look for any missing nuts, bolts and cotter keys.
  • Check for power steering fluid leaks or damage to power steering hoses.
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Question #529 (3 of 10)

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When inspecting the air and electrical connections to the trailer, which of the following items does NOT need to be checked?

  • Make sure the trailer electrical plug is firmly seated and locked in place.
  • Make sure the brake fluid lines are properly attached and not leaking
  • Check that trailer air connectors are sealed and in good condition.
  • Make sure glad hands are locked in place, free of damage and oil/grease that can cause air leaks.

Air/Electrical Connections

  • Check that trailer air connectors are sealed and in good condition.
  • Make sure glad hands are locked in place, free of damage and oil/grease that can cause air leaks.
  • Make sure the trailer electrical plug is firmly seated and locked in place.
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Question #514 (4 of 10)

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When doing an emergency system check on air brake systems, the tractor parking valve and the trailer parking valve should close (pop out) when the pressure gets below what reading?

  • 60-80 psi
  • 20-45 psi
  • 10-30 psi
  • 80 - 100 psi
Emergency System Check. Turn electrical power on and begin fanning off the air pressure by rapidly applying and releasing the foot brake. Low air warning devices (buzzer, light, other) should activate before air pressure drops below 60 psi. Continue to fan off the air pressure. Normally within the range of 20-45 psi on a tractor-trailer combination vehicle, the tractor parking valve and the trailer parking valve should close (pop out). On other combination vehicle types and single vehicle types, the parking brake valve should close (pop out).
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Question #507 (5 of 10)

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Which of the following is NOT one of the dash indicators you will look for during your pre-trip inspection?

  • Antilock Braking System (ABS) indicator
  • Air lines reversed indicator
  • Left turn signal indicator
  • Four-way emergency flashers

Test that dash indicators work when corresponding lights are turned on:

  • Left turn signal
  • Right turn signal.
  • Four way emergency flashers.
  • High-beam headlight.
  • Antilock Braking System (ABS) indicator.
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Question #516 (6 of 10)

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What do you check for with the safety belt during a pre-trip inspection?

  • The belt is not ripped or frayed
  • All these are correct
  • The belt adjusts and latches properly
  • The belt is securely mounted
Check that the safety belt is securely mounted, adjusts and latches properly, and is not ripped or frayed.
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Question #504 (7 of 10)

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Which of the following is NOT one of the belts you will check during a pre-trip inspection of the engine compartment?

  • Power steering belt
  • Water pump belt
  • Alternator belt
  • Camshaft belt

Check the following belts for snugness (up to 1/4-inch play at center of belt), cracks or frays:

  • Power steering belt.
  • Water pump belt.
  • Alternator belt.
  • Air compressor belt.
The camshaft is inside the engine and does not have a belt you can see or check.
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Question #530 (8 of 10)

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What should you check for when checking the landing gear on the trailer?

  • Make sure the crank handle is secured and the support frame is not damaged
  • Check that the landing gear is fully raised
  • All of these are correct
  • Make sure there are no missing parts
Check that the landing gear is fully raised, has no missing parts, crank handle is secure and the support frame is not damaged.
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Question #513 (9 of 10)

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When doing an emergency system check on air brake systems, the low air warning device (buzzer, light, other) should activate when the pressure gets below what reading?

  • 100 psi
  • 140 psi
  • 80 psi
  • 60 psi
Emergency System Check. Turn electrical power on and begin fanning off the air pressure by rapidly applying and releasing the foot brake. Low air warning devices (buzzer, light, other) should activate before air pressure drops below 60 psi. Continue to fan off the air pressure. Normally within the range of 20-45 psi on a tractor-trailer combination vehicle, the tractor parking valve, and parking brake valve should close (pop out). On other combination vehicle types and single vehicle types, the parking brake valve should close (pop out).
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Question #527 (10 of 10)

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In addition to checking for spare electrical fuses (if equipped), three red reflective triangles and a properly charged and rated fire extinguisher, school bus drivers must also inspect which of the following emergency equipment?

  • Tool kit and tire patching kit
  • Emergency flares and flashlight
  • First aid kit and body fluid cleanup kit
  • None of these are correct

In addition to checking for spare electrical fuses (if equipped), three red reflective triangles and a properly charged and rated fire extinguisher, school bus drivers must also inspect the following emergency equipment:

  • First Aid Emergency Kit
  • Body Fluid Cleanup Kit
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About The Pre-Trip Inspectin CDL Exam

The The Pre-Trip Inspectin portion of the CDL Exam is required to obtain your CDL. During the pre-trip inspection, you must show that the vehicle is safe to drive. You may 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.

Drivers need to have knowledge of how the actual vehicle(s) that they are conducting the test in operate. The drivers need to be able to explain and demonstrate different checks for the examiner as requested.

Taking the CDL Pre-trip Inspection Test

Class A Pre-trip Inspection Test

If you are applying for a Class A CDL, you will be required to perform a pre-trip inspection in the vehicle you have brought with you for testing. The vehicle must be a combination vehicle, representative of the unit you will be driving and must meet the class weight requirements. If the vehicle is an air brake vehicle, you must first pass the air brake knowledge test. You also must have passed all applicable endorsement knowledge tests that pertain to the vehicle you bring in for testing. Your test will require an inspection of the areas of the vehicle as instructed by your CDL examiner.

Class B and C Pre-trip Inspection Test

If you are applying for a Class B or C CDL, you will be required to perform a pre-trip inspection in the vehicle you have brought with you for testing. The vehicle must be a straight truck, passenger bus or school bus, representative of the vehicle you will be driving and must meet the class weight requirements. If the vehicle is an air brake vehicle, you must first pass the air brake knowledge test. You also must have passed all applicable endorsement knowledge tests that pertain to the vehicle you bring in for testing. Your test will require an inspection of the areas of the vehicle as instructed by your CDL examiner.

TruckingTruth's Pre-Trip Inspection Study Guide

We have an excellent Pre-trip Inspection Study Guide which includes a complete pre-trip inspection with photos and descriptions, numerous pre-trip inspection videos, and a complete vehicle checklist.

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