GD&T Exam questions n answers
graded A+ already passed
Most Descriptive View - correct answer ✔✔ front face
Should features be dimensioned more than once in technical sketch? - correct answer ✔✔ no
Should you dimension hidden lines in technical sketches? - correct answer ✔✔ no
Should you dimension over the body of a part in technical sketches? - correct answer ✔✔ no
Cconvert Entities - correct answer ✔✔ used to convert previous sketches into one sketch
Converts two edges together
With this feature you can create one or more curves in a sketch by projecting an edge, loop,
face, curve, or external sketch contour, set of edges, or set of sketch curves onto the sketch
plane
Datum - correct answer ✔✔ A theoretical horizontal plane from which heights and depths are
measured.
It is theoretical because no surface is exactly perfect
It is a theoretical reference axis, plane, or point
,Basic Dimension - correct answer ✔✔ * Basic Dimensions are theoretically exact numerical
values.
* When Basic Dimensions are used, permissible variations MUST be specified by: tolerances in a
Feature Control Frame, on other dimensions, or in notes.
* Basic dimensions are enclosed in a box:
* They may also be invoked by a note on the drawing:
* Example : UNTOLERANCED DIMENSIONS LOCATING TRUE POSITION ARE BASIC
* Tolerances stated in the title block do not apply to Basic Dimensions
Feature Control Frame - correct answer ✔✔ A rectangular object which specifies the tolerance
for the geometric characteristic to be controlled & any modifying conditions that are required.
A geometric characteristic, geometric tolerance, modifiers,
and datum reference (if any) for an individual feature are
specified by means of a feature control frame.
This is how you communicate the details of the part's GD&T
When Basic Dimensions are applied, a feature control frame is needed to specify the positional
tolerance of the feature
LECTURE 5 PAGE 24
Isometric Drawing - correct answer ✔✔ ▪ The object's vertical lines are drawn vertically
▪ Horizontal lines in the width and depth planes are shown
at 30 degrees to the horizontal.
▪ Lines parallel to the isometric axes are at their true
,(scale) length.
▪ Lines that are not parallel to the isometric axes are not
to scale (e.g. incline surfaces).
▪ Should not be dimensioned or notated.
Orthographic or Multi-view - correct answer ✔✔ ▪This Multi-view approach is called
Orthographic Projection.
▪This allows all six principal views (sides) of the object to be viewed at once.
▪How does this work on an 2D engineering drawing?
The Glass Box Approach - correct answer ✔✔ Method for Displaying 6 principal views in
orthographic/multi-view drawing:
▪ Imagine the object in a glass box
▪ Freeze the view from each direction and unfold
▪ The result is the 6 principal views
▪ Every face of the object can be viewed on one plane/surface
▪ The rear view can be unfolded to the left or right side
▪ You don't necessarily need all 6 views. Only however many are needed to fully detail the
object. Often times this can be done with 2 or 3 views.
LECTURE 4 | PAGE 5
1st Angle Projection - correct answer ✔✔ First angle projection is a method of creating a 2D
drawing of a 3D object.
opposite:
, bottom goes on top, right goes on left, top goes on bottom
i.e. think of a car in a bowl
1st angle - car is on top of the bowl
LOOK FOR IMAGE ON GOOGLE
3rd Angle Projection - correct answer ✔✔ Third Angle projection is a method of orthographic
projection which is a technique in portraying a 3D design using a series of 2D views.
straight forward:
bottom goes got, right goes right, top goes top
i.e. think of a car in a bowl
3rd angle - car is in the bowl
Difference between Angle Projections - correct answer ✔✔ which quadrant each side view of
an object goes into
Types of Lines in Technical Drawings:
Thick - correct answer ✔✔ Outline, visible edges, surface boundaries of objects, margin lines
Types of Lines in Technical Drawings:
Continuous Thin - correct answer ✔✔ Dimension lines, extension lines, section lines leader or
pointer lines, construction lines, boarder lines
graded A+ already passed
Most Descriptive View - correct answer ✔✔ front face
Should features be dimensioned more than once in technical sketch? - correct answer ✔✔ no
Should you dimension hidden lines in technical sketches? - correct answer ✔✔ no
Should you dimension over the body of a part in technical sketches? - correct answer ✔✔ no
Cconvert Entities - correct answer ✔✔ used to convert previous sketches into one sketch
Converts two edges together
With this feature you can create one or more curves in a sketch by projecting an edge, loop,
face, curve, or external sketch contour, set of edges, or set of sketch curves onto the sketch
plane
Datum - correct answer ✔✔ A theoretical horizontal plane from which heights and depths are
measured.
It is theoretical because no surface is exactly perfect
It is a theoretical reference axis, plane, or point
,Basic Dimension - correct answer ✔✔ * Basic Dimensions are theoretically exact numerical
values.
* When Basic Dimensions are used, permissible variations MUST be specified by: tolerances in a
Feature Control Frame, on other dimensions, or in notes.
* Basic dimensions are enclosed in a box:
* They may also be invoked by a note on the drawing:
* Example : UNTOLERANCED DIMENSIONS LOCATING TRUE POSITION ARE BASIC
* Tolerances stated in the title block do not apply to Basic Dimensions
Feature Control Frame - correct answer ✔✔ A rectangular object which specifies the tolerance
for the geometric characteristic to be controlled & any modifying conditions that are required.
A geometric characteristic, geometric tolerance, modifiers,
and datum reference (if any) for an individual feature are
specified by means of a feature control frame.
This is how you communicate the details of the part's GD&T
When Basic Dimensions are applied, a feature control frame is needed to specify the positional
tolerance of the feature
LECTURE 5 PAGE 24
Isometric Drawing - correct answer ✔✔ ▪ The object's vertical lines are drawn vertically
▪ Horizontal lines in the width and depth planes are shown
at 30 degrees to the horizontal.
▪ Lines parallel to the isometric axes are at their true
,(scale) length.
▪ Lines that are not parallel to the isometric axes are not
to scale (e.g. incline surfaces).
▪ Should not be dimensioned or notated.
Orthographic or Multi-view - correct answer ✔✔ ▪This Multi-view approach is called
Orthographic Projection.
▪This allows all six principal views (sides) of the object to be viewed at once.
▪How does this work on an 2D engineering drawing?
The Glass Box Approach - correct answer ✔✔ Method for Displaying 6 principal views in
orthographic/multi-view drawing:
▪ Imagine the object in a glass box
▪ Freeze the view from each direction and unfold
▪ The result is the 6 principal views
▪ Every face of the object can be viewed on one plane/surface
▪ The rear view can be unfolded to the left or right side
▪ You don't necessarily need all 6 views. Only however many are needed to fully detail the
object. Often times this can be done with 2 or 3 views.
LECTURE 4 | PAGE 5
1st Angle Projection - correct answer ✔✔ First angle projection is a method of creating a 2D
drawing of a 3D object.
opposite:
, bottom goes on top, right goes on left, top goes on bottom
i.e. think of a car in a bowl
1st angle - car is on top of the bowl
LOOK FOR IMAGE ON GOOGLE
3rd Angle Projection - correct answer ✔✔ Third Angle projection is a method of orthographic
projection which is a technique in portraying a 3D design using a series of 2D views.
straight forward:
bottom goes got, right goes right, top goes top
i.e. think of a car in a bowl
3rd angle - car is in the bowl
Difference between Angle Projections - correct answer ✔✔ which quadrant each side view of
an object goes into
Types of Lines in Technical Drawings:
Thick - correct answer ✔✔ Outline, visible edges, surface boundaries of objects, margin lines
Types of Lines in Technical Drawings:
Continuous Thin - correct answer ✔✔ Dimension lines, extension lines, section lines leader or
pointer lines, construction lines, boarder lines
