• 50 questions

ASE B4 Practice Test

Unofficial structural damage repair practice in the four content areas of ASE's B4 test, every answer with its source.

The two frame rails point in different directions instead of lying parallel. Which frame damage is this?

Pick an answer, then press Check answer. Then you see Correct or Not quite, with the reason. Keys: A to D pick, Enter checks.

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Exam mode: 50 questions, 75 minutes.

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Unofficial practice questions, not affiliated with the National Institute for Automotive Service Excellence (ASE). Bank checked October 13, 2026.

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All 50 questions

Frame inspection and repair 16

  • A frame has length, width, height, diamond and twist damage. Which is corrected first, by the ERIC sequence for repairing damaged frames? Auto Body Repair and Repainting: Instructional Units (1974), ERIC ED114594, under body measurement unit, section XII. ASE B4 content area A, Frame Inspection and Repair (16 of 50 questions)
  • A frame has sidesway damage. Which measurement shows it, by ASE's B4 task list? ASE Collision Study Guide (2026), B4 task list, task A.6. ASE B4 content area A, Frame Inspection and Repair (16 of 50 questions)
  • A frame pull is under way with chains and a pull arm. Which safety rule applies? Auto Body Repair and Repainting: Instructional Units (1974), ERIC ED114594, power tools and equipment unit, frame equipment. ASE B4 content area A, Frame Inspection and Repair (16 of 50 questions)
  • A hard collision has bent both the frame and the body. Which is checked and straightened first? US Army subcourse OD1653, Metal Body Repair, lesson 1, roughing and aligning. ASE B4 content area A, Frame Inspection and Repair (16 of 50 questions)
Show all 50 questions (46 more)

Frame inspection and repair, continued

  • ASE's B4 task list pairs each kind of frame damage with a reference. Sag or kickup is a change in what? ASE Collision Study Guide (2026), B4 task list, task A.5. ASE B4 content area A, Frame Inspection and Repair (16 of 50 questions)
  • By ASE's B4 task list, mash or collapse damage is a change in what? ASE Collision Study Guide (2026), B4 task list, task A.4. ASE B4 content area A, Frame Inspection and Repair (16 of 50 questions)
  • In which direction is corrective force applied to collision damage? US Army subcourse OD1653, Metal Body Repair, lesson 1, roughing and aligning. ASE B4 content area A, Frame Inspection and Repair (16 of 50 questions)
  • On a perimeter frame, what are the torque boxes? Wikipedia, Vehicle frame, Design features. ASE B4 content area A, Frame Inspection and Repair (16 of 50 questions)
  • One frame rail has been driven forward of the other. Which damage is this, and how is it found? Auto Body Repair and Repainting: Instructional Units (1974), ERIC ED114594, under body measurement unit, terms and definitions. ASE B4 content area A, Frame Inspection and Repair (16 of 50 questions)
  • The two frame rails point in different directions instead of lying parallel. Which frame damage is this? Auto Body Repair and Repainting: Instructional Units (1974), ERIC ED114594, under body measurement unit, terms and definitions. ASE B4 content area A, Frame Inspection and Repair (16 of 50 questions)
  • What is a tram gauge built to do? Auto Body Repair and Repainting: Instructional Units (1974), ERIC ED114594, under body measurement unit, terms and definitions. ASE B4 content area A, Frame Inspection and Repair (16 of 50 questions)
  • The wheelbase is trammed on both sides of a truck. What does this check? Auto Body Repair and Repainting: Instructional Units (1974), ERIC ED114594, under body measurement unit, terms and job sheet 2. ASE B4 content area A, Frame Inspection and Repair (16 of 50 questions)
  • Which frame is built of two symmetrical rails running the length of the vehicle, joined by several cross-members? Wikipedia, Vehicle frame, Ladder frame. ASE B4 content area A, Frame Inspection and Repair (16 of 50 questions)
  • Which gauge has a horizontal bar, two vertical bars and a sighting pin that always stays in the middle? Auto Body Repair and Repainting: Instructional Units (1974), ERIC ED114594, under body measurement unit, terms and definitions. ASE B4 content area A, Frame Inspection and Repair (16 of 50 questions)
  • Why are the separate parts of automobile and truck frames riveted together, by the Army subcourse? US Army subcourse OD1653, Metal Body Repair, lesson 1, frame construction. ASE B4 content area A, Frame Inspection and Repair (16 of 50 questions)
  • Why does the Army subcourse warn against applying excessive heat to main frame members? US Army subcourse OD1653, Metal Body Repair, lesson 1, frame construction. ASE B4 content area A, Frame Inspection and Repair (16 of 50 questions)

Unibody inspection, measurement and repair 18

  • A bolted subframe is refitted after a structural pull. Why does it often sit on rubber bushings? Wikipedia, Subframe, opening section. ASE B4 content area B, Unibody and Unitized Structure Inspection, Measurement, and Repair (18 of 50 questions)
  • A unibody car has a front subframe. What does a subframe do? Wikipedia, Subframe, opening section. ASE B4 content area B, Unibody and Unitized Structure Inspection, Measurement, and Repair (18 of 50 questions)
  • A whole body section is treated as a cube for X-checking. Which diagonals are compared? US Army subcourse OD1653, Metal Body Repair, lesson 1, measurement principles. ASE B4 content area B, Unibody and Unitized Structure Inspection, Measurement, and Repair (18 of 50 questions)
  • After the door openings are checked, the front section diagonals are found to be unequal. What does the Army subcourse do next? US Army subcourse OD1653, Metal Body Repair, lesson 1, roughing and aligning. ASE B4 content area B, Unibody and Unitized Structure Inspection, Measurement, and Repair (18 of 50 questions)
  • Both sides of a car are damaged, so a door opening cannot be compared with the other side. What does the Army subcourse do? US Army subcourse OD1653, Metal Body Repair, lesson 1, roughing and aligning. ASE B4 content area B, Unibody and Unitized Structure Inspection, Measurement, and Repair (18 of 50 questions)
  • Centering gauges are hung under a damaged car. Which is one of their three uses? Auto Body Repair and Repainting: Instructional Units (1974), ERIC ED114594, under body measurement unit, section VII. ASE B4 content area B, Unibody and Unitized Structure Inspection, Measurement, and Repair (18 of 50 questions)
  • How are centering gauges hung so that their sighting pins show the center line? Auto Body Repair and Repainting: Instructional Units (1974), ERIC ED114594, under body measurement unit, sections VIII and IX. ASE B4 content area B, Unibody and Unitized Structure Inspection, Measurement, and Repair (18 of 50 questions)
  • How far may the test plate move when the roof of a car is loaded in the roof crush test of FMVSS 216a? 49 CFR 571.216a, S5.1. ASE B4 content area B, Unibody and Unitized Structure Inspection, Measurement, and Repair (18 of 50 questions)
  • In body construction terms, what is a rocker panel? Auto Body Repair and Repainting: Instructional Units (1974), ERIC ED114594, conventional and unitized body and frame construction unit, terms. ASE B4 content area B, Unibody and Unitized Structure Inspection, Measurement, and Repair (18 of 50 questions)
  • In underbody measurement, what is the center line? Auto Body Repair and Repainting: Instructional Units (1974), ERIC ED114594, under body measurement unit, terms and definitions. ASE B4 content area B, Unibody and Unitized Structure Inspection, Measurement, and Repair (18 of 50 questions)
  • In underbody measurement, what is the datum line? Auto Body Repair and Repainting: Instructional Units (1974), ERIC ED114594, under body measurement unit, terms and definitions. ASE B4 content area B, Unibody and Unitized Structure Inspection, Measurement, and Repair (18 of 50 questions)
  • In underbody measurement, which two measurements can be made at every major measuring point? Auto Body Repair and Repainting: Instructional Units (1974), ERIC ED114594, under body measurement unit, section V. ASE B4 content area B, Unibody and Unitized Structure Inspection, Measurement, and Repair (18 of 50 questions)
  • Some pillars and rails are made of hot-stamped boron steel. What does hot stamping do to a typical boron steel? Wikipedia, Boron steel, Uses. ASE B4 content area B, Unibody and Unitized Structure Inspection, Measurement, and Repair (18 of 50 questions)
  • Sound deadener was burned off during a floor repair. What is sound deadener for? Auto Body Repair and Repainting: Instructional Units (1974), ERIC ED114594, conventional and unitized body and frame construction unit, terms. ASE B4 content area B, Unibody and Unitized Structure Inspection, Measurement, and Repair (18 of 50 questions)
  • What does a crumple zone in a unibody structure do in a collision? Wikipedia, Crumple zone, opening section. ASE B4 content area B, Unibody and Unitized Structure Inspection, Measurement, and Repair (18 of 50 questions)
  • What does the Army subcourse mean by alignment, and how is misalignment best checked? US Army subcourse OD1653, Metal Body Repair, lesson 1, roughing and aligning. ASE B4 content area B, Unibody and Unitized Structure Inspection, Measurement, and Repair (18 of 50 questions)
  • What is unitized body construction? Auto Body Repair and Repainting: Instructional Units (1974), ERIC ED114594, conventional and unitized body and frame construction unit, terms. ASE B4 content area B, Unibody and Unitized Structure Inspection, Measurement, and Repair (18 of 50 questions)
  • X-checking a door opening or underbody section rests on which principle? US Army subcourse OD1653, Metal Body Repair, lesson 1, roughing and aligning. ASE B4 content area B, Unibody and Unitized Structure Inspection, Measurement, and Repair (18 of 50 questions)

Stationary glass 4

  • In the windshield mounting crash test of FMVSS 212, how much of the windshield periphery must a car with air bags retain? 49 CFR 571.212, S5.1 and S5.2. ASE B4 content area C, Stationary Glass (4 of 50 questions)
  • Replacement glass is checked before it is bonded in. Which mark shows the maker has certified it under FMVSS 205? 49 CFR 571.205, S6.2. ASE B4 content area C, Stationary Glass (4 of 50 questions)
  • What holds a laminated windshield together when it breaks? Wikipedia, Laminated glass, opening section. ASE B4 content area C, Stationary Glass (4 of 50 questions)
  • What is the dark ceramic band (frit) around the edge of a bonded windshield for? Wikipedia, Windshield, Safety. ASE B4 content area C, Stationary Glass (4 of 50 questions)

Welding, cutting and joining 12

  • A destructive test shows a MIG weld with lack of penetration. What is the usual cause and cure, by the Navy manual? US Navy Steelworker, Volume 1 (1996), chapter 8, common weld defects. ASE B4 content area D, Welding, Cutting, and Joining (12 of 50 questions)
  • A MIG weld on a rail burns through. Which correction does the Navy manual give? US Navy Steelworker, Volume 1 (1996), chapter 8, common weld defects. ASE B4 content area D, Welding, Cutting, and Joining (12 of 50 questions)
  • How do self-piercing rivets differ from solid and blind rivets? Wikipedia, Rivet, Self-piercing rivets. ASE B4 content area D, Welding, Cutting, and Joining (12 of 50 questions)
  • In squeeze-type resistance spot welding, what do the two electrodes do besides carry the current? Wikipedia, Spot welding, opening section. ASE B4 content area D, Welding, Cutting, and Joining (12 of 50 questions)
  • Porosity is found in the crater at the end of each MIG weld. What usually causes it? US Navy Steelworker, Volume 1 (1996), chapter 8, common weld defects. ASE B4 content area D, Welding, Cutting, and Joining (12 of 50 questions)
  • The puddle of a MIG weld rolls over base metal that never melted. Which defect is this? US Navy Steelworker, Volume 1 (1996), chapter 8, common weld defects. ASE B4 content area D, Welding, Cutting, and Joining (12 of 50 questions)
  • Pure argon is used to shield a MIG weld on steel. What does the Navy manual say usually results? US Navy Steelworker, Volume 1 (1996), chapter 8, shielding gas. ASE B4 content area D, Welding, Cutting, and Joining (12 of 50 questions)
  • Short pieces of electrode wire stick through the root side of a MIG joint. What causes these whiskers? US Navy Steelworker, Volume 1 (1996), chapter 8, common weld defects. ASE B4 content area D, Welding, Cutting, and Joining (12 of 50 questions)
  • Two pieces of unequal thickness are MIG welded. Where does the Navy manual point the torch? US Navy Steelworker, Volume 1 (1996), chapter 8, welding positions. ASE B4 content area D, Welding, Cutting, and Joining (12 of 50 questions)
  • Which GMAW travel technique gives greater penetration and is used on heavy-gauge metal? US Navy Steelworker, Volume 1 (1996), chapter 8, welding positions. ASE B4 content area D, Welding, Cutting, and Joining (12 of 50 questions)
  • Which materials can a plasma arc cutter cut? Wikipedia, Plasma cutting, opening section. ASE B4 content area D, Welding, Cutting, and Joining (12 of 50 questions)
  • Wire used with carbon dioxide shielding gas contains manganese, silicon or aluminum. What are these elements for? US Navy Steelworker, Volume 1 (1996), chapter 8, shielding gas. ASE B4 content area D, Welding, Cutting, and Joining (12 of 50 questions)

How this list was compiled: Our own questions, written to the test specifications and task list for Structural Analysis and Damage Repair (Test B4) in the ASE Collision Study Guide (https://ase.com/wp-content/uploads/ASE_Collision_Study_Guide.pdf, marked (c) ASE 2026, read 2026-10-13): A frame inspection and repair 16 questions, B unibody and unitized structure inspection, measurement, and repair 18, C stationary glass 4, D welding, cutting, and joining 12; total 50. The bank holds the same 16, 18, 4 and 12. Each fact was read on 2026-10-13 in the public text named under its question: the B4 task list itself for the three damage definitions it prints; Auto Body Repair and Repainting: Instructional Units (1974), ERIC ED114594; US Army subcourse OD1653, Metal Body Repair (archive.org/details/metal-body-repair); US Navy Steelworker, Volume 1 (1996), chapter 8; federal rules at ecfr.gov (49 CFR 571.205, 571.212 and 571.216a); and Wikipedia for frame types, crumple zones, boron steel, subframes, glass, rivets, spot welding and plasma cutting. The sample questions printed in the study guide were not used. Licence: Questions, choices and explanations are original work of this site.

How it works

This free ASE B4 practice test has 50 structural analysis and damage repair questions of our own, spread over its four content areas like the real test. It is unofficial: the National Institute for Automotive Service Excellence (ASE) did not write, review or endorse it.

Read the full guide

How the 50 questions are split

ASE's study guide gives the 50 scored questions as frame inspection and repair 16, unibody and unitized structure inspection, measurement and repair 18, stationary glass 4, and welding, cutting and joining 12. The bank matches those counts.

Where the answers come from

Damage types and gauges come from ASE's own task list and a public instructional unit, measuring principles from a US Army body repair course, welding faults from a Navy manual, and glass and roof figures from federal standards.

What this bank leaves out

Electronic three-dimensional measuring systems, sectioning locations and a vehicle maker's joining procedure change by vehicle and are not in a public source, so no question guesses at them.

  • Learn each damage type with its reference: length from body zero, height from the datum, width from the centerline.
  • Frame and unibody are 34 of the 50 questions, so measuring matters more than welding.

Questions and answers

How many questions are on the ASE B4 test?

60, by ASE's 2026 Collision study guide: 50 scored and 10 research questions that do not count, in 75 minutes. Nothing marks the research questions. Recertification is a shorter test of 25 questions in 30 minutes.

What is on the ASE B4 structural test?

Measuring and repairing frames and unibody structures: mash, sag, sidesway, twist and diamond damage, anchoring and pulling, replacing rails, pillars and rocker panels, bonded stationary glass, and welding, riveting and cutting structural parts.

Does B4 count toward Master Collision Repair and Refinish Technician?

Yes. ASE's Collision study guide stars B2, B3, B4 and B5 as the tests needed to become an ASE Master Collision Repair & Refinish Technician. B6, damage analysis and estimating, has no star.

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