SOC Flashcards
How do you draw vertical lines and slanted lines?
By using the T-square to support the triangle
What are the two most common types of triangles?
A 45° triangle and a 30 x 60° triangle
Describe a parallel straight edge.
Similar to a T-square except it is supported on both things which makes it more accurate.
What is a draftsman triangle?
It’s an adjustable triangle to help determine the angle of pre-existing lines.
What are the two types of technical views?
Orthographic and pictorial
What is the most common technical view?
Orthographic
What is the major advantage of and orthographic drawing?
It will show every part of an object that is parallel to the drawing plane in true relative size and position.
What are the three views that you will most likely see an orthographic drawing projected?
Front, top, right side
Describe a pictorial drawing question.
A drawing that is presented as it appears to the eye. It is easier to visualize an object if its features can be shown in a single view. Typically does not contain any construction details.
What are the three types of pictorial drawings?
Isometric, oblique, perspective
How can you identify a isometric view?
The object will be tilted so that all three planes from the same angle. This is the most common type of technical drawing. (30° by 60°)
How can you identify an oblique drawing?
An object is drawn from the front view but you can see the top and the side as well. (45°)
How can you identify a perspective drawing?
A perspective drawing is drawn using a vanishing point.
Describe extension lines.
Thin, unbroken line. Used to indicate extent of dimensions.
Describe visible lines.
Heavy, unbroken lines. Used to indicate visible edges of an object.
Describe a break (long).
Fin, solid rolled line with freehand zigzags. Used to reduce size of drawing required to delineate object and reduce detail.
Describe a break (short).
Thick, solid freehand lines. Used to indicate a short break.
Describe a cutting or viewing plane. (viewing plane optional)
Thick, short dashes. Used to show offset with arrowheads to show direction in which section or plane is viewed or taken.
Describe a cutting plane for complex or offset views.
Sick, short dashes. Used to show offset with airheads the show direction viewed.
Describe hidden lines.
Medium lines with short, evenly spaced bashes. Used to indicate concealed edges.
Describe center lines.
Thin lines made up of long and short – is alternating space and constant in length used to indicate symmetry about an axis and location of sinners.
Describe dimension lines.
Then lines terminated with arrowheads at each end. Used to indicate distance measured.
Describe a leader line.
Thin line terminated with arrowhead or dot at one end; used to indicate a part, dimension, or other reference.
Describe a phantom or datum line.
Medium series of one long dashes and too short dashes evenly spaced with long dashes. Used to indicate alternate position of parts, repeated details, or datum plane.
What are the two types of symbols?
Architectural symbols and material convention symbols.
What are the two types of scales?
Architects and engineers.
Describe the architects scale.
Mostly used for building construction and when length is measured in feet and inches.
Describe and engineers scale.
Used mostly on site plans and Highway projects where distances are measured in feet and tenths of feet.
What is the T-square used for?
Drawing horizontal lines.
What are the three major components of concrete?
Water, aggregates, Portland cement
What are the two functions of water in a concrete mix?
Effects hydration, improve workability
Concrete is composed of what composite materials?
Coarse aggregate, fine aggregate, hydraulic cement, water, air
In aggregates, what is the most common contaminating materials?
Dirt, Clay, salt
How do you determine the largest practical size for the aggregates?
Should not exceed 1/5 the diameter of the wall, 1/3the slab thickness, 3/4 of the clear space between reinforcing bars
What are the five types of Portland cement?
Type1-normal Portland Type2-modified Type3-high early Type4-low heat Type5-sulfate resistant
