1What is the primary meaning of the term 'Orthographic'?
A.Straight writing
B.Right-angled drawing
C.Angular projection
D.Parallel view
Correct Answer: Right-angled drawing
Explanation:
'Ortho' means right angle and 'graphic' means drawing or description. It implies projections are perpendicular to the plane.
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2In orthographic projection, the projectors are drawn ____ to the plane of projection.
A.Inclined at 45 degrees
B.Perpendicular
C.Parallel
D.Tangent
Correct Answer: Perpendicular
Explanation:
The defining characteristic of orthographic projection is that the lines of sight (projectors) strike the projection plane at a 90-degree angle.
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3Where is the observer assumed to be located in an orthographic projection?
A.Inside the object
B.At a finite distance
C.At an infinite distance
D.Touching the plane
Correct Answer: At an infinite distance
Explanation:
To ensure projectors are parallel to each other and perpendicular to the plane, the observer is assumed to be at infinity.
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4The two principal planes of projection are usually designated as:
A.Ground Plane (GP) and Picture Plane (PP)
B.Horizontal Plane (HP) and Vertical Plane (VP)
C.Vertical Plane (VP) and Profile Plane (PP)
D.Auxiliary Plane (AP) and Vertical Plane (VP)
Correct Answer: Horizontal Plane (HP) and Vertical Plane (VP)
Explanation:
The HP and VP are the primary reference planes that intersect at the XY line to form quadrants.
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5The Front View of an object is projected onto which plane?
A.Vertical Plane
B.Profile Plane
C.Auxiliary Plane
D.Horizontal Plane
Correct Answer: Vertical Plane
Explanation:
The Front View (Elevation) is viewed from the front and projected onto the Vertical Plane located behind or in front of the object.
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6In standard orthographic projection, the intersection of the Horizontal Plane and Vertical Plane is called the:
A.Profile Line
B.Reference Line (XY Line)
C.Projector Line
D.Trace Line
Correct Answer: Reference Line (XY Line)
Explanation:
The line of intersection between the HP and VP is the reference line, commonly labeled X-Y.
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7In First Angle Projection, the object is positioned in which quadrant?
A.Fourth Quadrant
B.First Quadrant
C.Third Quadrant
D.Second Quadrant
Correct Answer: First Quadrant
Explanation:
First Angle Projection assumes the object is placed in the first quadrant, where the object is between the observer and the projection plane.
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8In Third Angle Projection, what is the relative position of the plane of projection?
A.Irrelevant
B.Behind the object
C.Between the observer and the object
D.Perpendicular to the observer only
Correct Answer: Between the observer and the object
Explanation:
In Third Angle Projection, the plane of projection is assumed to be transparent and placed between the observer and the object.
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9When converting 3D to 2D in orthographic projection, how is the Horizontal Plane (HP) manipulated?
A.It is rotated 90 degrees counter-clockwise
B.It is rotated 90 degrees clockwise
C.It remains fixed
D.It is folded upwards
Correct Answer: It is rotated 90 degrees clockwise
Explanation:
To align the views on a single sheet of paper, the HP is rotated 90 degrees clockwise until it aligns with the VP.
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10In First Angle Projection, where is the Top View drawn relative to the Front View?
A.To the left of the Front View
B.Above the Front View
C.To the right of the Front View
D.Below the Front View
Correct Answer: Below the Front View
Explanation:
Because the object is in the 1st quadrant and HP rotates down, the Top View appears below the reference line (and the Front View).
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11In Third Angle Projection, where is the Top View drawn relative to the Front View?
A.Below the Front View
B.Overlaying the Front View
C.Beside the Front View
D.Above the Front View
Correct Answer: Above the Front View
Explanation:
In the 3rd quadrant, the HP is above the object. When rotated, the Top View projects upward, appearing above the Front View.
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12Which projection system is commonly used in the United States?
A.Isometric Projection
B.First Angle Projection
C.Third Angle Projection
D.Oblique Projection
Correct Answer: Third Angle Projection
Explanation:
The USA and Canada primarily use Third Angle Projection standard for engineering drawings.
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13The standard symbol for First Angle Projection looks like:
A.A trapezoid on the left, two concentric circles on the right
B.Two triangles
C.A square and a circle
D.Two concentric circles on the left, a trapezoid on the right
Correct Answer: Two concentric circles on the left, a trapezoid on the right
Explanation:
The symbol represents a frustum of a cone. In 1st angle, the circle (view from left) is projected to the right of the trapezoid (front view). However, standard placement usually shows the circle on the left if projecting the left side view to the right.
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14In First Angle Projection, the Left Side View is drawn on which side of the Front View?
A.Right side
B.Bottom side
C.Left side
D.Top side
Correct Answer: Right side
Explanation:
In 1st angle, the view is projected onto the plane behind the object. The Left Side View projects to the profile plane on the right.
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15Which line type is used to represent invisible edges in an orthographic drawing?
A.Continuous thick line
B.Phantom line
C.Center line
D.Hidden line (dashed)
Correct Answer: Hidden line (dashed)
Explanation:
Hidden lines (short dashes) are used to show features or edges that are not visible from the current viewing angle.
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16Which AutoCAD command is used to load and manage different line styles like Dashed or Center?
A.LINETYPE
B.LAYER
C.PROPERTIES
D.LINE
Correct Answer: LINETYPE
Explanation:
The LINETYPE command opens the manager to load specific styles like 'Hidden' or 'Center' into the drawing.
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17A Center Line is represented by:
A.Short dashes only
B.Zig-zag line
C.Alternating long and short dashes
D.Continuous thin line
Correct Answer: Alternating long and short dashes
Explanation:
Center lines denote axes of symmetry or centers of circles and consist of a chain of long and short dashes.
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18Which AutoCAD command allows you to move objects a specified distance in a specified direction?
A.PAN
B.ARRAY
C.MOVE
D.COPY
Correct Answer: MOVE
Explanation:
The MOVE command displaces objects without changing their orientation or size.
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19What is the shortcut key for the MOVE command in AutoCAD?
A.M
B.MO
C.O
D.MV
Correct Answer: M
Explanation:
M is the standard command alias for MOVE.
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20To rotate an object in AutoCAD, you must define a:
A.Scale factor
B.Displacement vector
C.Base point
D.Mirror line
Correct Answer: Base point
Explanation:
The Base Point is the pivot point around which the object rotates.
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21Positive rotation in AutoCAD is typically in which direction?
A.Upwards
B.Counter-Clockwise
C.Clockwise
D.Downwards
Correct Answer: Counter-Clockwise
Explanation:
By default in AutoCAD, angles are measured counter-clockwise from the positive X-axis.
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22Which command creates a duplicate of an object while leaving the original in place?
A.ROTATE
B.MIRROR
C.COPY
D.MOVE
Correct Answer: COPY
Explanation:
The COPY command functions identically to Move, but it creates a duplicate rather than displacing the original.
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23Which command is used to remove unwanted portions of a line that crosses another object?
A.ERASE
B.TRIM
C.DELETE
D.BREAK
Correct Answer: TRIM
Explanation:
TRIM cuts objects to meet the edges of other objects (cutting edges).
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24What is the shortcut key for the TRIM command in AutoCAD?
A.T
B.TR
C.TI
D.TM
Correct Answer: TR
Explanation:
TR is the standard command alias for TRIM.
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25Which command deletes an entire object from the drawing?
A.CUT
B.ERASE
C.TRIM
D.REMOVE
Correct Answer: ERASE
Explanation:
ERASE (shortcut E) removes selected objects completely from the drawing database.
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26To create a symmetrical copy of an object across a line, which command is used?
A.MIRROR
B.ROTATE
C.COPY
D.ARRAY
Correct Answer: MIRROR
Explanation:
MIRROR creates a reverse copy of the object across a specified axis (mirror line).
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27When using the MIRROR command, AutoCAD asks if you want to:
A.Trim source objects
B.Erase source objects
C.Scale the source object
D.Rotate source objects
Correct Answer: Erase source objects
Explanation:
After defining the mirror line, AutoCAD prompts 'Erase source objects? [Yes/No]'.
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28Which command changes the size of an object proportionally?
A.STRETCH
B.SCALE
C.ZOOM
D.EXTEND
Correct Answer: SCALE
Explanation:
The SCALE command enlarges or reduces selected objects equally in X, Y, and Z directions.
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29If you apply a Scale Factor of 0.5, the object will:
A.Reduce to half its size
B.Move 0.5 units
C.Double in size
D.Rotate 50 degrees
Correct Answer: Reduce to half its size
Explanation:
A scale factor less than 1 reduces the size; 0.5 makes it 50% of the original size.
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30Which command connects two objects with a tangent arc (rounded corner)?
A.ARC
B.BLEND
C.CHAMFER
D.FILLET
Correct Answer: FILLET
Explanation:
FILLET creates a rounded corner between two lines or curves using a specified radius.
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31If the Radius is set to 0 in the FILLET command, what is the result?
A.An error
B.A sharp corner
C.A circular corner
D.No change
Correct Answer: A sharp corner
Explanation:
Filleting with a radius of 0 is a common technique to trim or extend two lines to form a sharp intersection.
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32Which command connects two lines with a beveled (angled) corner?
A.EXTEND
B.FILLET
C.TRIM
D.CHAMFER
Correct Answer: CHAMFER
Explanation:
CHAMFER creates a straight line connection (bevel) between two non-parallel lines.
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33To define a Chamfer, you usually specify:
A.Center point
B.Two distances or a distance and an angle
C.Radius
D.Diameter
Correct Answer: Two distances or a distance and an angle
Explanation:
Chamfers are defined by the distance cut back from the intersection on both lines, or one distance and the angle of the cut.
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34Which command creates multiple copies of an object in a pattern?
A.COPY
B.MULTIPLE
C.ARRAY
D.GROUP
Correct Answer: ARRAY
Explanation:
ARRAY distributes object copies in Rectangular, Polar, or Path patterns.
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35In a Rectangular Array, the pattern is defined by:
A.Radius and axis
B.Rows and Columns
C.Path and items
D.Center point and angle
Correct Answer: Rows and Columns
Explanation:
Rectangular arrays are arranged in a grid format defined by the number of rows and columns and the spacing between them.
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36Which type of Array distributes objects around a center point?
A.Path
B.Rectangular
C.Polar
D.Circular
Correct Answer: Polar
Explanation:
Polar Array copies objects in a circular pattern around a specified center point.
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37When using the LTSCALE command, what are you adjusting?
A.The thickness of the line
B.The color of the line
C.The scale factor of the linetype pattern
D.The length of the line
Correct Answer: The scale factor of the linetype pattern
Explanation:
LTSCALE (LineType Scale) controls the global display scale of dashes and spaces in non-continuous lines.
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38In orthographic projection, if a surface is parallel to a plane of projection, its projection on that plane is:
A.A line
B.True shape and size
C.Foreshortened
D.A point
Correct Answer: True shape and size
Explanation:
When a surface is parallel to the viewing plane, the resulting view reflects the actual dimensions and shape of that surface.
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39In orthographic projection, if a surface is perpendicular to a plane of projection, it appears as:
A.A point
B.True shape
C.A line
D.Distorted
Correct Answer: A line
Explanation:
A surface viewed 'edge-on' (perpendicular to the view plane) projects as a single straight line.
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40In AutoCAD, to ensure lines are drawn perfectly horizontal or vertical, which mode should be ON?
A.GRID
B.SNAP
C.OSNAP
D.ORTHO
Correct Answer: ORTHO
Explanation:
Ortho mode (F8) restricts cursor movement to the horizontal (X) and vertical (Y) axes.
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41What is the function of Object Snap (OSNAP)?
A.Snaps to specific geometric points on objects
B.Restricts angle movement
C.Snaps to grid points
D.Automatically dimensions the object
Correct Answer: Snaps to specific geometric points on objects
Explanation:
OSNAP allows precise selection of geometric points like Endpoints, Midpoints, Centers, and Intersections.
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42When drawing orthographic views in AutoCAD, which command helps project features from one view to another accurately?
A.DONUT
B.XLINE (Construction Line)
C.SPLINE
D.ARC
Correct Answer: XLINE (Construction Line)
Explanation:
XLINE creates infinite lines used as construction guides to project widths, heights, and depths between views.
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43Which view usually gives the most information about the object?
A.Top View
B.Bottom View
C.Front View
D.Side View
Correct Answer: Front View
Explanation:
The Front View is typically chosen to show the maximum characteristics and dimensions (Length and Height) of the object.
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44The dimension showing the depth (width) of an object is common to which two views?
A.Front and Rear
B.Front and Top
C.Front and Side
D.Top and Side
Correct Answer: Top and Side
Explanation:
The Top view shows Length and Depth (Width); the Side view shows Height and Depth (Width).
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45In AutoCAD, which key allows you to quickly repeat the last used command?
A.Esc
B.Shift
C.Spacebar or Enter
D.Tab
Correct Answer: Spacebar or Enter
Explanation:
Pressing Spacebar or Enter immediately after a command finishes will re-invoke that same command.
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46What is the result of the EXPLODE command on an Array?
A.It deletes the array
B.It changes the array type
C.It hides the array
D.It converts the associative array into individual objects
Correct Answer: It converts the associative array into individual objects
Explanation:
Modern AutoCAD arrays are associative (grouped). EXPLODE breaks the group into independent objects.
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47Which AutoCAD command is used to restore the most recently erased objects?
A.RETURN
B.OOPS
C.REDO
D.BACK
Correct Answer: OOPS
Explanation:
OOPS restores objects erased by the last ERASE command, even if other commands were executed subsequently (unlike Undo).
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48A 'Miter Line' drawn at 45 degrees is used to transfer dimensions between:
A.Isometric and Orthographic
B.Top View and Side View
C.Front View and Top View
D.Front View and Side View
Correct Answer: Top View and Side View
Explanation:
A 45-degree miter line allows the transfer of depth dimensions from the Top View to the Side View (or vice versa) without measuring.
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49If a line is inclined to the HP and parallel to the VP, its Front View will be:
A.A point
B.A horizontal line
C.True length and inclined
D.A line shorter than true length
Correct Answer: True length and inclined
Explanation:
Since it is parallel to the VP, the projection on the VP (Front View) captures the true length and the inclination.
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50In AutoCAD, 'Window Selection' (dragging left to right) selects:
A.Only objects completely inside the window
B.Anything the window touches
C.The last drawn object
D.Only text objects
Correct Answer: Only objects completely inside the window
Explanation:
A blue window (Left to Right) selects only items fully enclosed. A green crossing window (Right to Left) selects anything touched.