AutoCAD Quiz: Fillet And Chamfer
10 questions · exam conditions
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Fillet And ChamferQuestion 1 of 10

Two intersecting line objects must receive a rounded transition, but the original lines must remain available at their full lengths for later revisions. The current fillet radius is 15 mm15\text{ mm}.

Which FILLET configuration produces the required result in a single operation?

Set Trim mode to Trim, then select both lines near the required corner.
Set Trim mode to No Trim, then select both lines near the required corner.
Set the radius to zero, enable Trim, and select both lines near the corner.
Set the radius to zero, enable No Trim, and select both lines near the corner.
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AutoCAD Quiz

AutoCAD Quiz: Fillet And Chamfer

Practice Fillet And Chamfer in AutoCAD with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.

What this quiz covers

This quiz focuses on Fillet And Chamfer, giving you a quick way to practice the rules, question types, and explanations that matter most for AutoCAD.

How to use this quiz

Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.

All questions

Question 1

Two intersecting line objects must receive a rounded transition, but the original lines must remain available at their full lengths for later revisions. The current fillet radius is 15 mm15\text{ mm}.

Which FILLET configuration produces the required result in a single operation?

  1. Set Trim mode to Trim, then select both lines near the required corner.
  2. Set Trim mode to No Trim, then select both lines near the required corner. (correct answer)
  3. Set the radius to zero, enable Trim, and select both lines near the corner.
  4. Set the radius to zero, enable No Trim, and select both lines near the corner.
Explanation: Whenever you see a FILLET question that mentions preserving original geometry, your focus should immediately shift to AutoCAD's Trim mode setting, which controls whether source lines are cut back after the arc is inserted. With Trim mode set to No Trim, AutoCAD places the fillet arc at the correct tangent points but leaves both lines completely intact at their original lengths — exactly what the passage requires. Since the current radius is already 15 mm15\text{ mm}, no radius change is needed. You simply switch to No Trim and pick both lines near the corner. That's option B, and it accomplishes everything in a single operation. Option A fails because Trim mode set to Trim shortens each line to the tangent point where the arc begins, destroying the full-length geometry the problem explicitly says must be preserved. Option C sets the radius to zero, which produces a sharp corner (a point, not a rounded transition) — and even with Trim enabled, you lose line length and gain nothing useful. Option D also uses a zero radius, so no rounded arc is created at all; "No Trim" is correct in spirit but the zero radius means the operation doesn't produce the required rounded transition, making it doubly wrong. A helpful memory rule: No Trim = non-destructive. The arc is drawn, the lines stay whole. Any time a question uses language like "original lines must remain," "available for revision," or "full length," that's your signal to reach for No Trim mode before touching anything else.

Question 2

A drafter uses FILLET and changes its Trim option to No Trim. Without changing the related setting afterward, the drafter starts CHAMFER and selects two intersecting lines.

What trim behavior should the drafter expect from CHAMFER?

  1. CHAMFER leaves the original lines untrimmed because the trim setting is shared and remains current. (correct answer)
  2. CHAMFER trims the original lines because every new editing command restores Trim mode automatically.
  3. CHAMFER trims only the first line because FILLET settings apply only to the second selected object.
  4. CHAMFER asks for the trim behavior again because it cannot use a setting established by FILLET.
Explanation: When working with FILLET and CHAMFER in AutoCAD, it's essential to understand that these two commands share a common Trim mode setting. This setting persists across both commands — it doesn't reset when you switch from one to the other. When the drafter sets FILLET to No Trim, that setting is stored in the system variable TRIMMODE, which controls trimming behavior for both FILLET and CHAMFER. Since the drafter doesn't change this variable before running CHAMFER, it still reads No Trim, so CHAMFER will leave the original lines intact beyond the chamfer endpoints. This makes A the correct answer — the shared setting carries over exactly as left. B is wrong because AutoCAD does not automatically restore Trim mode when you start a new editing command. Settings like TRIMMODE are persistent until you deliberately change them. C describes behavior that doesn't exist — FILLET's trim setting doesn't apply selectively to one object versus another; it's a global toggle. D is incorrect because CHAMFER doesn't prompt you to re-enter the trim preference mid-command if a valid setting already exists; it simply uses whatever TRIMMODE is currently set to. A useful study tip: think of TRIMMODE as a toggle switch on the wall — flipping it for FILLET flips it for CHAMFER too. Whenever an AutoCAD question mentions changing a behavior setting in one command and then asks what a related command will do, your first instinct should be to ask: "Is this setting shared?" For FILLET and CHAMFER, the answer is always yes.

Question 3

A chamfer must be defined using a setback of 30 mm30\text{ mm} on one edge and a specified direction for the chamfer line. The drafter chooses CHAMFER's Angle method.

How do object-selection order and the entered angle affect this operation?

  1. The distance applies to the first selected object, and the angle is measured relative to that object's direction. (correct answer)
  2. The distance applies to the second selected object, and the angle is measured relative to the second object's direction.
  3. The distance applies equally to both objects, and the angle is measured from the UCS X-axis regardless of object orientation.
  4. The distance defines the chamfer segment's total length, and the angle defines the included angle between the two source objects.
Explanation: When AutoCAD's CHAMFER command uses the Angle method, it operates asymmetrically — which is exactly what this question tests. Instead of defining two equal or independent setback distances, you provide one distance and one angle, and the order in which you select objects determines how those values are applied. The distance you enter (here, 30 mm30\text{ mm}) is measured as a setback along the first selected line. The angle is then measured relative to that same first line, controlling how steeply the chamfer cuts across toward the second line. This makes selection order critical: swap the two lines and you get a geometrically different chamfer. Answer A correctly captures this — the distance governs the first object, and the angle is measured from that object's direction. Answer B is wrong because it reverses the logic entirely. The distance applies to the first selected object, not the second. Answer C introduces a common misconception about the UCS X-axis. The chamfer angle is not measured from the UCS origin or any global axis — it's relative to the selected object itself, making the operation orientation-independent in a practical sense but still tied to the object's local direction. Answer D confuses the Angle method with something closer to a geometric property of the resulting chamfer shape; neither value represents total segment length nor the included angle between the two source lines. Your study tip: always remember that CHAMFER has two modes — Distance/Distance and Distance/Angle. When you see "Angle method," mentally flag that selection order matters and the angle is local to the first picked object, not global.

Question 4

Two finite line segments do not currently meet, but their projected paths intersect. A tangent fillet of the current radius will fit if the segments are extended. Trim mode is enabled.

What is the most efficient valid workflow?

  1. Use EXTEND on both segments first because FILLET operates only on objects that already intersect.
  2. Use JOIN on the segments first because FILLET requires them to be one continuous object.
  3. Run FILLET directly and select the segments near the intended projected corner. (correct answer)
  4. Disable Trim mode first because FILLET cannot extend source objects while trimming is enabled.
Explanation: When working with FILLET in AutoCAD, the key concept to understand is that the command is far more capable than many users realize — it doesn't require objects to already touch or intersect before you run it. FILLET can automatically extend, trim, or connect two non-intersecting line segments as long as their projected paths would intersect and the specified radius fits geometrically. This means C is the correct and most efficient workflow: simply run FILLET and click each segment near the corner where you want the fillet placed. AutoCAD calculates the projected intersection, extends both lines to that point, trims them back by the fillet radius, and inserts the arc — all in a single operation. A is wrong because it reflects a common misconception. FILLET does not require objects to physically intersect beforehand. Running EXTEND first adds unnecessary steps and defeats the purpose of FILLET's built-in projection logic. B is equally incorrect — JOIN combines collinear or connected segments into a single polyline, which is unrelated to filleting two separate lines meeting at a corner. FILLET works on two discrete objects; they don't need to be joined. D misunderstands Trim mode entirely. Trim mode controls whether FILLET trims the source segments back after placing the arc. With Trim mode enabled (the default and typically preferred setting), the command still extends objects as needed — disabling it would actually leave unwanted geometry behind, not fix anything. As a study tip, remember that FILLET, CHAMFER, and BLEND all have built-in extend-and-trim intelligence. When you see a question suggesting you must "prepare" objects before these commands, that's almost always a distractor.

Question 5

Two line objects cross, creating several possible regions in which a fillet could be placed. The radius and Trim mode are already correct, but the drafter must round one specific corner formed by the crossing lines.

What should the drafter do to control which fillet solution AutoCAD uses?

  1. Select each line near the portions that form the desired corner because pick locations influence the solution. (correct answer)
  2. Select each line anywhere because AutoCAD always places the fillet in the upper-right region.
  3. Reverse the line creation order because object age determines which crossing region receives the fillet.
  4. Change the UCS origin to the desired corner because selection locations do not affect fillet placement.
Explanation: When working with the FILLET command on two crossing lines, AutoCAD has multiple valid corners it could round — upper-left, upper-right, lower-left, or lower-right. The key concept being tested here is how AutoCAD determines which corner receives the fillet: it uses your pick locations on each line as directional hints, applying the fillet to the corner nearest to where you clicked on both objects. This makes A the correct answer. When you select each line near the segments that form your desired corner, you're essentially pointing AutoCAD toward that specific region. The closer your picks are to the intended corner, the more reliably AutoCAD resolves the fillet there. This behavior is consistent and intentional — pick location is your primary control mechanism. Answer B is wrong because AutoCAD has no built-in preference for the upper-right region. It doesn't assume a default corner; it interprets your input geometrically based on where you click. Believing in a fixed default would lead to repeated frustration on real projects. Answer C is a misconception about how AutoCAD tracks object history. The order in which lines were drawn has no bearing on fillet placement. AutoCAD evaluates geometry at the time of the command, not object age or creation sequence. Answer D gets things exactly backwards. Changing the UCS origin affects the coordinate system used for input and display, but it does not override the role of pick locations in the FILLET command. Selection location absolutely matters. Study tip: Whenever a fillet or chamfer question involves crossing or ambiguous geometry, ask yourself "where did the drafter click?" — pick proximity to the desired corner is always the deciding factor.

Question 6

Two parallel lines are 20 mm20\text{ mm} apart. The current FILLET radius is 6 mm6\text{ mm}, and the drafter selects the two parallel lines in a configuration where a fillet between them can be created.

What radius is required for the tangent fillet arc between the parallel lines?

  1. The arc uses the current 6 mm6\text{ mm} radius and is tangent to the first selected line only, leaving the second line unaffected.
  2. The arc uses a 20 mm20\text{ mm} radius because the perpendicular distance between the lines becomes the fillet radius directly.
  3. The arc uses a 10 mm10\text{ mm} radius because its diameter must equal the 20 mm20\text{ mm} spacing between the lines. (correct answer)
  4. No arc can be created because FILLET requires the projected paths of the selected lines to intersect at some point.
Explanation: When AutoCAD's FILLET command is applied to two parallel lines, it behaves differently than with intersecting lines — and that distinction is exactly what this question tests. With parallel lines, AutoCAD ignores the current fillet radius setting entirely and instead calculates the required radius automatically based on the geometry. Here's the geometry: for a circular arc to be tangent to both parallel lines simultaneously, it must touch each line at exactly one point, with its center equidistant from both. If the lines are 20 mm20\text{ mm} apart, the center of the arc must sit exactly 10 mm10\text{ mm} from each line — meaning the radius must equal 10 mm10\text{ mm}, and the diameter (2×10=20 mm2 \times 10 = 20\text{ mm}) spans the full gap. Answer C is correct. A is wrong because a fillet between parallel lines cannot be tangent to only one line — by definition, a connecting fillet must be tangent to both. The current radius is also overridden automatically. B contains a subtle unit error: the 20 mm20\text{ mm} spacing equals the arc's diameter, not its radius. Confusing diameter for radius is a classic trap here — don't fall for it. D is wrong because AutoCAD specifically handles the parallel-line case as a special exception; no intersection point is needed, which is precisely why the command overrides your radius setting. Study tip: Memorize this rule — parallel line fillets always use a radius equal to half the distance between the lines, and the stored FILLET radius is ignored. Exam questions often test whether you know this override exists.

Question 7

A closed rectangular lightweight polyline measures 200 mm200\text{ mm} by 120 mm120\text{ mm}. The drafter sets a fillet radius of 10 mm10\text{ mm} and chooses FILLET's Polyline option.

What should occur when the rectangle is selected?

  1. Only the nearest corner is rounded, and the rectangle is converted into separate line and arc objects.
  2. All suitable corners are rounded, and the resulting line and arc segments remain in one polyline. (correct answer)
  3. Opposite corners are rounded, and the other corners remain sharp until FILLET is repeated.
  4. All corners are rounded, but each new arc becomes a separate object outside the original polyline.
Explanation: When you see a question about AutoCAD's FILLET command, the key distinction to understand is the difference between filleting individual line objects versus using the Polyline option on a closed polyline. That distinction is exactly what this question tests. When you invoke FILLET with the Polyline option and select a closed polyline, AutoCAD processes every vertex in that polyline in a single operation, rounding all corners where the specified radius geometrically fits. Critically, the result remains a single, unified polyline — the new arc segments are not broken out as separate objects. They are simply new segments within the same polyline entity. For this 200 mm×120 mm200\text{ mm} \times 120\text{ mm} rectangle with a 10 mm10\text{ mm} radius, all four corners can accept the fillet, so all four are rounded simultaneously, confirming that B is correct. Choice A describes the behavior of filleting two individual line objects without the Polyline option — AutoCAD rounds only the one shared corner and may trim or extend those lines, but the result is not a unified polyline. Choice C reflects a common misconception about older-style FILLET behavior where you select two objects at a time; alternating corners being skipped is not how the Polyline option works. Choice D is the most tempting trap — students assume the new arcs become separate objects — but AutoCAD specifically maintains polyline integrity when you use the Polyline option. Your study tip: always associate the Polyline option with "all at once, stays one object." If you're ever unsure, remember the Polyline option exists precisely to save you from repeating FILLET at every corner manually.

Question 8

Two nonparallel lines nearly meet, but one stops short of their projected intersection. The drafter needs a sharp, closed corner rather than a rounded transition and wants FILLET to adjust the lines automatically.

Which settings and result satisfy the requirement?

  1. Use any positive radius with No Trim enabled; the lines are extended to a sharp intersection automatically.
  2. Use a zero radius with No Trim enabled; a tangent arc is added while both lines remain unchanged.
  3. Use any positive radius with Trim enabled; the arc is suppressed when the lines do not initially touch.
  4. Use a zero radius with Trim enabled; the lines are extended or trimmed to intersect without an arc. (correct answer)
Explanation: When working with AutoCAD's FILLET command, two independent settings control the outcome: the radius value and the Trim mode. Understanding how these interact is the key to answering this question correctly. A zero radius tells FILLET to create no arc at all — just a clean, sharp corner. Trim mode (the default) instructs AutoCAD to automatically extend or trim the selected lines so they meet exactly at their projected intersection. Together, these two settings give you precisely what the scenario describes: two non-touching lines that need to form a closed, sharp corner without any curved transition. That makes D the correct answer. Here's why the other choices fail. A uses a positive radius, which always generates a tangent arc — the opposite of a "sharp corner." Enabling No Trim also means the original lines are left as-is, so nothing is extended or trimmed to close the gap. B correctly uses a zero radius, but No Trim mode defeats the purpose — the lines won't be extended or shortened, so the gap between them remains open. No arc is added either, meaning nothing useful happens. C uses Trim mode correctly but pairs it with a positive radius, which produces an arc rather than a sharp corner. The arc is not "suppressed" just because the lines don't initially touch — FILLET still inserts it once the lines are extended to their intersection. A handy memory rule: Zero radius = sharp corner, Trim = lines move to meet. Anytime a question asks about closing a gap with a crisp corner, that combination — zero radius with Trim enabled — is your answer.

Question 9

CHAMFER is set to the two-distance method with the first distance equal to 20 mm20\text{ mm} and the second distance equal to 8 mm8\text{ mm}. Trim mode is enabled. A horizontal line is selected first, followed by a perpendicular vertical line.

How are the chamfer setbacks assigned?

  1. The horizontal line receives the 8 mm8\text{ mm} setback, and the vertical line receives the 20 mm20\text{ mm} setback.
  2. The horizontal line receives the 20 mm20\text{ mm} setback, and the vertical line receives the 8 mm8\text{ mm} setback. (correct answer)
  3. Both lines receive the 20 mm20\text{ mm} setback because the first distance controls the entire chamfer.
  4. Both lines receive the 8 mm8\text{ mm} setback because the second selection completes and controls the chamfer.
Explanation: When using AutoCAD's CHAMFER command in two-distance mode, the order in which you select lines directly controls which distance applies to which line. The first distance is always assigned to the first line you pick, and the second distance is assigned to the second line you pick — it's a strict one-to-one pairing based on selection sequence. In this scenario, the first distance is 20 mm20\text{ mm} and the second is 8 mm8\text{ mm}. Since the horizontal line is selected first, it receives the 20 mm20\text{ mm} setback. The vertical line, selected second, receives the 8 mm8\text{ mm} setback. That makes B the correct answer. A reverses the logic — it assigns 8 mm8\text{ mm} to the first-selected line and 20 mm20\text{ mm} to the second. This is backwards and represents the most common mistake students make: confusing which distance goes where. C incorrectly claims the first distance controls both lines. In two-distance mode, the whole point is to create an asymmetric chamfer — one distance per line. If both received the same setback, you'd simply use equal-distance mode instead. D makes the same structural error as C but inverts it, claiming the second selection governs the entire chamfer. Neither line overrides the other; each line gets its own assigned distance. A helpful memory aid: think of it as a contract — "first pick, first distance; second pick, second distance." On the AutoCAD exam, any question involving asymmetric CHAMFER settings will hinge on this selection-order rule, so make it automatic.

Question 10

Two perpendicular lines are chamfered in Trim mode. The first chamfer distance is 12 mm12\text{ mm}, and the second chamfer distance is zero. The first line is selected before the second line.

Which result should be expected?

  1. Neither line is modified because having unequal chamfer distances with one value at zero produces an invalid operation.
  2. The second line is set back 12 mm12\text{ mm}, while the chamfer reaches the theoretical intersection on the first line.
  3. Both lines are set back 12 mm12\text{ mm} because a zero second distance defaults to the first distance value.
  4. The first line is set back 12 mm12\text{ mm}, while the chamfer reaches the theoretical intersection on the second line. (correct answer)
Explanation: When working with AutoCAD's CHAMFER command, the key concept to understand is which line gets set back and which gets extended to the intersection. The chamfer distances apply in the order you select the lines — Distance 1 applies to the first line selected, Distance 2 applies to the second. Here, Distance 1 is 12 mm12\text{ mm} and Distance 2 is 0 mm0\text{ mm}. Because the first line is selected first, it gets trimmed back 12 mm12\text{ mm} from the theoretical intersection. The second line has a distance of zero, meaning it is not set back at all — the chamfer line meets the second line exactly at the theoretical intersection point. This makes D the correct result: the first line is set back 12 mm12\text{ mm}, while the chamfer reaches the theoretical intersection on the second line. A is wrong because a zero second distance is completely valid in AutoCAD — it simply means no setback on that line, producing what looks like a point-ended chamfer. The operation succeeds without error. B reverses the logic entirely. It describes the second line being set back and the chamfer reaching the intersection on the first line — the exact opposite of how selection order works. C is a fabricated rule. AutoCAD does not default a zero distance to match the first distance value; zero is a legitimate and intentional input meaning no setback. Study tip: Always associate Distance 1 with first click and Distance 2 with second click — selection order is everything in the CHAMFER command.