Principal and Reference Planes in Engineering Graphics
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Questions and Answers

In the third angle method of projection, the direction of the arrow is away from the:

  • X-axis
  • XY-line (correct)
  • XY-plane
  • Y-axis
  • A cutting plane parallel to the Horizontal Plane (HP) is called a:

  • Auxiliary Section Plane
  • Vertical Section Plane
  • Horizontal Section Plane (correct)
  • Profile Section Plane
  • When drawing a sectional view, the hatching lines are typically drawn at what angle to the principal outline or line of symmetry?

  • 90°
  • 30°
  • 45° (correct)
  • 60°
  • A cutting plane parallel to the Profile Plane (PP) is called a:

    <p>Profile Section Plane</p> Signup and view all the answers

    A cutting plane inclined to either the Horizontal Plane (HP) or the Vertical Plane (VP) is called an:

    <p>Auxiliary Section Plane</p> Signup and view all the answers

    A plane inclined to the Horizontal Plane (HP) and perpendicular to the Vertical Plane (VP) is called an:

    <p>Auxiliary Inclined Plane (AIP)</p> Signup and view all the answers

    What is the name of the line at which the Horizontal Plane (HP) and the Projection Plane (PP) meet?

    <p>X1Y1</p> Signup and view all the answers

    In what direction is the HP rotated to bring it in the plane with the VP?

    <p>Clockwise</p> Signup and view all the answers

    In what direction is the PP rotated with respect to the object?

    <p>Away from the object</p> Signup and view all the answers

    What is the assumption made about the views of an object?

    <p>The views are assumed to be in one plane</p> Signup and view all the answers

    What is the view called when the observer looks at the object from the front?

    <p>Front view</p> Signup and view all the answers

    What is the view called when the observer looks at the object from above?

    <p>Top view</p> Signup and view all the answers

    What is the definition of a Horizontal Plane (HP)?

    <p>A plane parallel to the ground (or horizon)</p> Signup and view all the answers

    Which type of plane is an Auxiliary Plane?

    <p>A plane inclined to the Horizontal Plane (HP) or Vertical Plane (VP) and perpendicular to another reference plane</p> Signup and view all the answers

    What are the principal planes or reference planes called in orthographic projections?

    <p>Principal Planes</p> Signup and view all the answers

    Which plane is perpendicular to both the Horizontal Plane (HP) and Vertical Plane (VP)?

    <p>Profile Plane (PP)</p> Signup and view all the answers

    What is an Oblique Plane in relation to the Horizontal Plane (HP) and Vertical Plane (VP)?

    <p>A plane inclined to both the Horizontal Plane (HP) and Vertical Plane (VP)</p> Signup and view all the answers

    What defines the line where the Horizontal Plane (HP) and Vertical Plane (VP) meet?

    <p>Horizontal Reference Line</p> Signup and view all the answers

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