PLTW ENGINEERING ESSENTIAL EXAM 2025 NEWEST EXAM COMPLETE QUESTIONS WITH DETAILED VERIFIED ANSWERS

What is engineering? - -Engineering is the application of mathematics and scientific principles to better or improve life. Different types of pictorials - -Isometric, Oblique, and Perspective What is a cavalier oblique pictorial? - -An oblique pictorial in which the height, width, and depth are represented at full scale. What is a cabinet oblique pictorial? - -An oblique pictorial in which depth is represented as half scale compared the the height and width scale. What is an oblique pictorial? - -A type of technical sketch in which the width dimension is horizontal. What is an isometric pictorial? - -A type of technical sketch in which the width dimension is not horizontal and it shows all three sides "equally". Three adjacent faces share a single point. What is the box method? - -A technique used in sketching to maintain proportionality. Starts with a sketcher envisioning an object contained within an imaginary box. What is a multiview drawing? - -A drawing that shows two or more two-dimensional views of a three-dimensional object. Width - -The measure of an object from side to side. Height - -The measure of an object from top to bottom. Depth - -The measure of an object from the front to the back. What are perspective drawings? - -A drawing that offers the most realistic 3d view of all the pictorial methods, since it portrays the object in a manner that is most similar to how the human eye perceives the visual world. Different types of perspective representations - -one point, two point, three point One-Point Perspective Drawing - -In this type of drawing, there is only one vanishing point on the horizon line. Two-Point Perspective Drawing - -In this type of drawing, there are two vanishing points, this is the most common type of drawing. Three-Point Perspective Drawing - -In this type of drawing, the view gets either a worm's eye view or a bird's eye view of an object. ENGINEERING ENGINEERING Perspective - -The depth lines recede to a single vanishing point and the width lines recede toward a vanishing point What is an orthographic projection? - -A technique used to create multiview drawings. Any projection of the features of an object onto an imaginary plane of projection. What is a projection plane? - -The surface onto which a two dimensional view of a three dimensional object is projected and created. Projection Lines - -They are used to project each corner outward until they reach the projection plane. What are hidden lines. - -Hidden edges in each view are indicated by dashed lines. Construction Line - -Very lightly drawn line to guide drawing other lines and shapes. Object Line - -Defines the object, thick and dark. Hidden Line - -Shows interior detail not visible from the outside of the part. Center Line - -Defines the center of arcs, circles, or symmetrical parts. Half as thick as an object line. Section Line - -Define where material is cut away. Short-Break Line - -Shows where part is broken to reveal detail behind the part or to shorten a long continuous part. Dimension Line - -Shows distance. Arrows drawn on ends to show where it starts and ends. The actual distance is typically located in the middle of this line to display distance. Extension Line - -Shows where a dimension starts and stops. Long-Break Line - -Shortens very long objects with uniform detail. Typically represented as a jagged cut or break. Leader Line - -Shows dimensions of arcs, circles, and detail, Significant Digits - -Digits in a decimal number that carry meaning indicating the certainty of the value. Precision - -The degree to which repeated measurements show the same result. (repeatability) ENGINEERING ENGINEERING Accuracy - -The degree of closeness of measurements of a quantity to the actual (or accepted) value. Unit Conversion - -Necessary in science and engineering to work across different systems of measurement or to express quantities in different units within a single system. Section View - -Used to show "inside" details not apparent on the exterior of the part. Cutting plane line - -A line showing where the object will be cut. Statistics - -The collection, evaluation, and interpretation of data. Variation - -Spread of values around the center. Distribution - -Summary of the frequency of values. Mean - -The sum of the values of a set of data divided by the number of values in that data set. Mode - -Measure of central tendency. The most frequently occurring value in a set of data. Median - -Measure of central tendency. The value that occurs in the middle of a set of data that has been arranged in numerical order. Range - -Measure of data variation. The difference between the largest and smallest values that occur in a set of data. Standard Deviation - -Measure of data variation/a measure of the spread of data values. Histogram - -A common data distribution chart that is used to show the frequency with which specific values, or values within ranges, occur in a set of data. Dot Plot - -A plot or chart of sorts that shows frequency of occurrence of data values. Population Standard Deviation - -The measure of the spread of data within a population. Used when you have a data value for every member of the entire population of interest. Sample Standard Deviation - -An estimate of the spread of data within a larger population. Used when you do not have a data value for every member of the entire population of interest. Uses a subset (sample