CDL Practice Tests: Pre-Trip Inspection

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Question #529 (1 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 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.
  • Make sure the brake fluid lines are properly attached and not leaking
  • Check that trailer air connectors are sealed and in good condition.

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 #503 (2 of 10)

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When doing a pre-trip inspection of the engine compartment, which of the following are you NOT looking for?

  • Look for puddles on the ground.
  • Make sure the air lines are properly attached to the trailer
  • Inspect hoses for condition and leaks.
  • Look for dripping fluids on the underside of the engine and transmission.

Engine Compartment (Engine Off) Leaks/Hoses

  • Look for puddles on the ground.
  • Look for dripping fluids on underside of engine and transmission.
  • Inspect hoses for condition and leaks.
The air lines do not connect to the trailer inside the engine compartment.
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Question #502 (3 of 10)

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During the pre-trip inspection test you must:

  • Walk around the vehicle and point to or touch each item
  • All these are correct
  • Explain to the examiner what you are checking and why
  • Show that the vehicle is safe to drive
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. At the time of your test, the examiner will direct you to the areas of the vehicle to inspect for the test. In addition to this section, you should also review Section 2 prior to conducting the pre-trip inspection.
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Question #509 (4 of 10)

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Which is the proper procedure for checking hydraulic brakes?

  • Hold the brake pedal down. Make sure the pedal slowly moves all the way to the floor within 10 seconds
  • Pump the brake pedal three times and then hold it down for five seconds. The brake pedal should not move (depress) during the five seconds.
  • Pump the brake three times and watch the hydraulic pressure gauge to make sure it's building pressure
  • All these are correct

Hydraulic Brake Check (if equipped)

  • Pump the brake pedal three times and then hold it down for five seconds. The brake pedal should not move (depress) during the five seconds.
  • If equipped with a hydraulic brake reserve (back-up) system, with the key off, depress the brake pedal and listen for the sound of the reserve system electric motor.
  • Check that the warning buzzer or light is off.
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Question #510 (5 of 10)

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When doing an air brake system leak check, which of the following is the correct setup for the test?

  • With the air pressure built up to the governor cut-off (120-140 psi), shut off the engine running, chock your wheels, (if necessary), and engage the tractor parking valve and trailer parking valve
  • 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
  • None of these are correct
  • Build the air pressure until it is between 50 - 60 pounds, keep the engine running, chock your wheels, (if necessary), release the tractor parking valve and trailer parking valve
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 #506 (6 of 10)

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When doing a pre-trip inspection of the power steering, play in the steering wheel should not exceed how much?

  • 20 degrees (or about 4 inches on a 20-inch wheel) before the front left wheel barely moves.
  • 30 degrees (or about 6 inches on a 20-inch wheel) before the front left wheel barely moves.
  • 10 degrees (or about 2 inches on a 20-inch wheel) before the front left wheel barely moves.
  • There should be zero degrees of play in the steering wheel
Power steering: With the engine running, check for excessive play by turning the steering wheel back and forth. Play should not exceed 10 degrees (or about 2 inches on a 20-inch wheel) before the front left wheel barely moves.
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Question #517 (7 of 10)

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

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

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 #525 (8 of 10)

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When doing a pre-trip inspection, what should you check on the battery box?

  • Battery box and cover or door must be secure
  • Battery connections should not show signs of excessive corrosion
  • All these are correct
  • Battery(s) are secure, connections are tight and cell caps are present

Battery/Box

  • Wherever located, see that battery(s) are secure, connections are tight and cell caps are present.
  • Battery connections should not show signs of excessive corrosion.
  • Battery box and cover or door must be secure.
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Question #524 (9 of 10)

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What are two indications of loose lug nuts?

  • Low hub oil level or brakes squeaking
  • Rusty trails or shiny threads
  • Twisted or bent valve stem and over-inflated tires
  • All these are correct
Check that all lug nuts are present, free of cracks and distortions and show no signs of looseness such as rust trails or shiny threads.
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Question #526 (10 of 10)

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When doing a pre-trip inspection, how much of a gap should there be between the 5th wheel and the trailer?

  • 1/4 inch
  • No less than 2 inches
  • No gap
  • 1 inch
Make sure there is no gap between the fifth-wheel and trailer, and check that locking jaws are fully closed around the kingpin.
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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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