Deck 10: Descriptive Geometry

Question 1

A truss is a frame that is usually three-dimensional and made of structural shapes.

Answer 1

False

Question 2

The point view of a line describes the inclination of a line in relation to the horizon.

Answer 2

False

Question 3

A fold line is represented by a thin, black line, and must be located in that plane.

Answer 3

False

Question 4

A fold line is drawn like a hidden line.

Question 5

The bearing and grade, or bearing and slope refers to the exact position of a fold line.

Question 6

Trusses are usually used in pairs or in multiples.

Question 7

In order to find an edge view of a plane, a true-length line must be located in that plane.

Question 8

Pitch and bevel are indicated in a similar manner.

Question 9

Notations are like footnotes.

Question 10

Azimuth bearing indicates the percent at which a line is angled.

Question 11

The term cuts and fills refers to earth being excavated for highways.

Question 12

Descriptive geometry is used by drafters, designers, and engineers because it graphically shows the solution to problems dealing with points, lines and planes, and their relationship in space.

Question 13

Methods of assembling truss joints include welding, riveting, and bolting.

Question 14

Notations are important because they are used to keep track of all views and points in space.

Question 15

A vector is a directed line segment that in computer graphics is defined by its two end points.

Question 16

The first step to determining the visibility of two intersecting lines (which of the two lines is closer) is to project the exact crossover point of the lines to an adjoining view.

Question 17

Space diagrams and force diagrams are used in truss analysis to determine the forces in the members of a truss.

Question 18

A contour line on a plot or a map is a line at a constant elevation on the surface of the earth, above sea level.

Question 19

When projecting a plane into another view, you must first find at least four points in the plane and project each point into the next view.

Question 20

The significance of contour lines being close together on a map is steep terrain.

Question 21

When determining bearing, if north is at the top of the paper, then _____ will be on the left side.

A)west
B)east
C) south
D) none of the above

Question 22

A point is called out in a given view by:

A)lowercase letters
B)uppercase letters
C) either upper- or lowercase letters
D) all of the above are correct

Question 23

Which of the following is an important rule to remember when projecting from one view to another?

A)Always project the top view of a line from a given front.
B)The customary 45-degree projection line is used.
C) The fold line is always placed between the front V and the top V.
D) Always skip a view between all measurements.

Question 24

A triangle would be identified as:

A)ABC
B)A-B-C
C) abc
D) a-b-c

Question 25

Which of the following is not part of the parallelogram law?

A)two vectors
B)not parallel, drawn to scale
C) parallel, drawn to scale
D) having the same units, and acting at the same point can be added or subtracted using a specific formula

Question 26

Which of the following is not true regarding trusses?

A)Trusses are seldom used in multiples.
B)Trusses seldom stand alone.
C) Trusses are frames that are usually two-dimensional.
D) Joints are assumed to be pinned, although they are welded, bolted, or riveted.

Question 27

When determining if a line is visible, consider:

A)if it looks like it should be visible
B)if it is closest to the fold line
C) if it is longer than the other line
D) if it is shorter than the other line

Question 28

When determining the true length of a line, the fold line must be drawn _____ to the line.

A)tangent
B)perpendicular
C) parallel
D) at 45 degrees

Question 29

Which of the following is not a step involved in determining the true distance between two nonparallel (or skewed) lines in space?

A)Project the true length of either one of the two lines, and project the other line into the auxiliary view.
B)Find the point view of the true length line, and project the other line into that secondary auxiliary view.
C) Measure the true distance between the point view line at a location that is perpendicular to the other line.
D) Project the same points from the front view into the right-side view.

Question 30

A point in space is projected and measured in a way similar to that of a _____.

A)point view of a line
B)line in space
C) nonparallel line
D) plane surface

Question 31

A vector, as defined in engineering, must possess both magnitude and _____.

A)volume
B)size
C) direction
D) length

Question 32

Given the bearing, slope, and length of a line, which of the following is not true when constructing the line in a drawing?

A)The bearing is always drawn in the top view.
B)The true length can be drawn if the line is to be exactly horizontal.
C) Any line with an incline up (+) or down (-) from the horizon must be laid out using specific steps.
D) If the line is horizontal, the true length must be constructed before the heading length can be drawn in the top view.

Question 33

Finding the true length of a line requires that end point distances are transferred from the fold line in the:

A)preceding view
B)second preceding view
C) front view
D) auxiliary view

Question 34

Which of the following is not an acceptable method for determining the intersection of two planes?

A)by inspection
B)by generating an edge view of the plane surface
C) by using the line projection method
D) both B and C

Question 35

To find the point view of a line, what must be determined first?

A)the edge view of a surface
B)the true shape of a surface
C) the true length of a line
D) the placement of the fold line

Question 36

Which of the following is the correct formula for determining the percent of grade?

A)units of horizon divided by units of vertical rise × 100
B)units of vertical rise divided by units of horizon × 100
C) units of horizon X units of vertical rise × 100
D) units of vertical rise X units of horizon × 100

Question 37

Which of the following is not a step involved in determining the true distance between two parallel lines in space?

A)Find the true length of each of the two lines.
B)Find the point view of each of the two lines.
C) Project a point view of the added true length line.
D) The true distance between the parallel lines is the straight-line path between their end points.

Question 38

Contour lines represent the:

A)approximate shape of the land
B)height of the terrain
C) steepness of the terrain
D) all of the above

Question 39

A piercing point is:

A)the exact location of an intersection of two lines
B)the exact location of an intersection of two surfaces
C) the exact location of an intersection of a plane and a surface line
D) the exact location of the intersection of a surface and a line

Question 40

A dihedral angle refers to the angle:

A)between a foreshortened line and the fold line
B)between two lines that are true length
C) between a plane and the fold line
D) between two planes