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Questions and Answers
Which type of motion involves an object moving in a straight line, side to side, or up and down?
Which type of motion involves an object moving in a straight line, side to side, or up and down?
What is the symbol used to represent clockwise motion?
What is the symbol used to represent clockwise motion?
Which of the following is an example of spiral motion?
Which of the following is an example of spiral motion?
What type of motion is characterized by objects spinning around a central point?
What type of motion is characterized by objects spinning around a central point?
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Which option best describes bidirectional motion?
Which option best describes bidirectional motion?
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What is the correct term for the motion that combines rotating and translating simultaneously?
What is the correct term for the motion that combines rotating and translating simultaneously?
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Which mechanical system component would use unidirectional motion?
Which mechanical system component would use unidirectional motion?
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Which of these best describes a unidirectional circular motion?
Which of these best describes a unidirectional circular motion?
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What type of motion would you associate with a pair of scissors when cutting?
What type of motion would you associate with a pair of scissors when cutting?
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Which mechanical system example would likely involve characteristics of both elasticity and resilience?
Which mechanical system example would likely involve characteristics of both elasticity and resilience?
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What type of motion transformation does a rack and pinion system exhibit?
What type of motion transformation does a rack and pinion system exhibit?
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Which system is described as having a screw that rotates while a nut translates?
Which system is described as having a screw that rotates while a nut translates?
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Which motion transformation system is reversible?
Which motion transformation system is reversible?
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In a screw gear system of type 2, what happens to the screw when the nut rotates?
In a screw gear system of type 2, what happens to the screw when the nut rotates?
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What describes the role of the cam in a cam and follower system?
What describes the role of the cam in a cam and follower system?
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Which system is NOT reversible according to its motion transformation?
Which system is NOT reversible according to its motion transformation?
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Which symbol represents a complete link in mechanical diagrams?
Which symbol represents a complete link in mechanical diagrams?
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What form of motion does a cam translate into when it drives a follower?
What form of motion does a cam translate into when it drives a follower?
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Which component in mechanical systems is usually associated with a helical guide?
Which component in mechanical systems is usually associated with a helical guide?
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What is the primary function of a connecting rod and crank system?
What is the primary function of a connecting rod and crank system?
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Which function is performed when sealing materials are used?
Which function is performed when sealing materials are used?
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What is a disadvantage of using fixed links in mechanical systems?
What is a disadvantage of using fixed links in mechanical systems?
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Which of the following is an example of a lubricating function?
Which of the following is an example of a lubricating function?
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What motion does a sliding link allow?
What motion does a sliding link allow?
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Which component is typically involved in guiding the motion of an object?
Which component is typically involved in guiding the motion of an object?
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In which type of link does rotation occur?
In which type of link does rotation occur?
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What does a spherical link facilitate in mechanical systems?
What does a spherical link facilitate in mechanical systems?
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Which linking component is most likely to cause wear and tear over time?
Which linking component is most likely to cause wear and tear over time?
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Which function would be classified under linking components?
Which function would be classified under linking components?
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Which of the following describes a sliding-rotating link?
Which of the following describes a sliding-rotating link?
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What is one of the primary advantages of using a screw as a linking component?
What is one of the primary advantages of using a screw as a linking component?
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Which characteristic distinguishes direct links from indirect links?
Which characteristic distinguishes direct links from indirect links?
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What is one disadvantage associated with using a spiral link?
What is one disadvantage associated with using a spiral link?
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Which of the following materials might be used as lubricants in mechanical systems?
Which of the following materials might be used as lubricants in mechanical systems?
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Study Notes
Technology Unit - Topics
- Topics covered include Technical Drawings, Views and Projections, Constraints, Properties of Materials, Mechanical Functions, and Motion Systems.
Types of Technical Drawings
- Design plan/diagram of principles: Shows the operation of parts using forces and motion symbols.
- Technical diagram: Shows the assembly of parts. Includes parts, links, guidance symbols, and materials legend.
- Sketch: A freehand drawing with basic geometric lines.
- Cross-sectional view: Shows the internal parts of an object via slicing.
- Exploded view: Parts are pulled apart to show individual components and assembly instructions.
- Cut-away view: Shows internal parts of an object with parts sliced open.
Drafting Lines
- Geometric lines: Drawn using a ruler and compass. Used for finding the center of a circle, creating arcs and rounding corners.
- Examples of geometric constructions include finding the center of a circle and drawing rounded corners.
Basic Lines
- Visible line/contour: Thick lines defining the object's outline.
- Hidden line/contour: Medium thickness dashed lines for features not visible in the current view.
- Center line: Thin lines with small dashes within a circle or symmetrical shape to represent the center.
- Extension line: Thin lines extending from a dimension point to show dimension.
- Dimension line: Thin lines with dimensions placed on object.
- Leader line: Thin lines connecting dimension and a part of the object that is being measured.
- Hatching line: Thin slanted lines evenly spaced to represent a material's surface in a sectional view.
- Cutting plane line: Thick lines with arrowheads showing the plane of sectional view.
Scaling
- Scaling is reducing or enlarging a drawing to represent its actual size using a ratio (drawing:actual).
- The actual size drawing has a ratio of 1:1.
- Scale reduction has a ratio of 1:2.
- Scale enlargement has a ratio of 2:1.
Dimensioning
- Dimensioning uses lines to indicate actual lengths, widths, heights, depths, and diameters of parts.
- Dimensions can be placed inside or outside of the drawing but should not overlap.
Practice Questions
- Practice problems are provided for each topic.
Projections
- Orthogonal projection: Light rays are perpendicular to the plane of the paper, creating multiple views that define a 3-D object.
- Multiview: Top, bottom, front, right & left side views.
- Isometric: Three-dimensional view; angles of 30° with the edges of the object.
- Oblique: One face of the object will face the view.
Constraints
- Constraint is a force imposed on a material resulting from external forces.
- Types of Constraints: Compression, Tension, Torsion, Deflection, and Shear.
- Examples of Constraints: crushing a can, squeezing a sponge, etc.
Properties
- Properties of materials determine resistance to constraints.
- Properties like hardness, ductility, malleability, elastic and resilience are characteristics of materials.
Materials (Metals & Alloys, Wood, etc.).
- Materials like metals and alloys, wood, plastics, ceramics, and composites are grouped by their main properties.
- Examples of Metals & Alloys: Iron, Aluminum, Copper, Steel, Plastic, wood.
Mechanical Systems
- Mechanical function: Movement or motion of objects or their components.
- Types of motion: Translation (rectilinear movement), rotation, and helical movement (combination of rotation and translation).
- Examples of mechanical functions: gluing, linking, guiding, sealing, lubricating
- Types of links: Fixed, Rotating, Sliding, Sliding-Rotating, Spherical, Spiral
Motion Systems
- Motion types: transmission and transformation.
- Transmission: Same type of motion is relayed from the driving part to the driven part.
- Transformation: Different types of motion are relayed from driving component to driven component.
- Components of motion systems: Driver, Driven, Intermediate (used in some systems)
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Description
This quiz covers essential topics from the Technology Unit, focusing on various types of technical drawings, including design plans, technical diagrams, and different views such as exploded and cross-sectional views. It also delves into drafting lines and geometric constructions vital for creating accurate representations in engineering. Test your knowledge on how these elements contribute to understanding mechanical functions and motion systems.
