Problems involving projection of points, projection of two points situated in different quadrants. The lines not parallel to axes 1, 2 and 3 are nonisometric lines. Parallel to one of the principal plane, inclined to one of the principal plane and. Inclined plane an inclined plane is perpendicular to one plan of projection and inclined to adjacent planes. Mar 14, 2017 projection of lines sh 12 engineering graphics f. Oct 24, 2016 a straight line 55 mm long makes an angle of 30 deg to the hp and 45 deg to the vp.
Suppose that the cart in figure 51 has a mass of 1. Inclination of its surface with one of the reference planes will be given. The line is parallel to vp and inclined to hp at 30. A line ab 50 mm long has its end a 20 mm in front of vp and 30 mm above hp. Inclination of one of its edges with other reference plane will be given hence this will be a case of an object inclined to both reference planes. Engineering drawing mostly asked mcq pdf part five for rrb alptechnician cbt 2.
Projections of planes parallel to one of the reference planes. It is at an angle inclined to the horizontal and profile planes and therefore it appears foreshortened in the top and side views. Projection of straight lines, situated in first quadrant only, inclined to both horizontal and vertical planes location of traces only. Section of above solids in simple vertical position axis perpendicular to hp alone by planes either inclined to hp or vp alone true shape of section.
Here various problems along with actual pictures of those situations are given for you to understand. Well be positioning this line in different ways that is it may be parallel or inclined to either or both the reference planes hpvp and then draw. Projections of a line kept parallel to both hp and vp problem 3 a line cd 30mm long is parallel to both the planes. Engineering drawing ed chapter wise video lectures. The lamina is tilted about the edge on which it rests till its plane surface is inclined to hp at 45 deg. These letters are used to represent a point, ends of a straight line, corners of a probability measures on metric spaces pdf solid, etc. The point c is 20mm above hp and 30mm in front of vp. Notice that the surface a appears as a line in the front orthographic view. Co 1 draw the projection of points and lines located in different quadrants. Lecture 12 projection of line inclined to both the plane.
Section of above solids in simple vertical position axis perpendicular to hp alone by planes either inclined to hp or vp alone. The inclined plane will be used to demonstrate how one force vector, the weight, can be decomposed into two component forces, one parallel to the plane and one perpendicular. It does appear as an edge in the view where it is perpendicular to the projection plane. A line ab has its end a 20 mm above the hp and 30 mm in front of vp. Therefore the traces of lines are determined in the following positions of the lines. Projections of lines inclined to both the planes 107. Projection of straight lines and planes first angle. The above position resulting in straight line as a top view and front view. Lines in 3d descriptive geometry carnegie mellon university. Similarly the projected length of the lines on to the planes will not be the same as the true length f the line. A straight line 55 mm long makes an angle of 30 deg to the hp and 45 deg to the vp. Projections of a plane inclined to both hp and vp problem from tj a rectangular plate of side 50.
Trend the direction of a line on a horizontal plane. Unitii orthographic projection, projection of planes classes. Pdf ge8152 engineering graphics eg books, lecture notes. Pdf ge8152 engineering graphics lecture notes, books. Lines inclined to one plane and parallel to the other. It cannot be viewed true size and shape in any of the principal views. The end a is 12 mm in front of the vp and 15 mm above hp. Draw its projections and determine the true length and apparent inclinations. The sides of the cube and all planes parallel to them are isometric planes. Actual projections in top and front views are drawn in thick lines.
Its end p is 10 mm above hp and 10 mm in front of vp. Tips for projection of straight linesiiinclined to both. A hexagonal plate of side 30mm is resting on one of its sides on vp and inclined at 40. The book provides all aspects and detailed study of engineering drawing plane and solid geometry, a core subject for all branches of engineering study, presented in a lucid manner and easytofollow style. The top view is a line inclined at an angle to xy line. Oct 12, 20 projection of planes plane inclined to both hp a. Here planes are inclined to both the reference planes. Line parallel to the horizontal plane inclined to the vertical plane. Solids of revolution when some of the plane figures are revolved about one. Determination of true length and true inclinations of straight lines from the projections not involving traces projection of plane surfaces like rectangle, square, pentagon, hexagon, circle surfaces inclined to one reference plane. Line inclined to one plane and parallel to the other exercises xa 105.
Parallel to one of the principal plane, inclined to one of the principal plane and parallel to other, inclined to both principal planes. The simplest position a straight line occupies in a space is, it is parallel to both v. Inclined lines parallel to one plane of projection and inclined in the other tow planes. When a line is inclined to both hp and vp, the apparent inclination of the line to both the projection planes will be different from the actual inclinations. In this tutorial we gonna be discussing as to how the orthographic projection of a line can be constructed when it is inclined to both hp and vp. Surface a is perpendicular to the frontal projection plane. Lecture 12 projection of line inclined to both the plane free download as powerpoint presentation. All projection lines are orthogonal to the projection plane. Sep 20, 2008 25 responses to projections of straight lines mid point problem. In orthographic projection, these two principal planes are used and are referred to as the. The other end b is 60 mm above the hp and 45 mm in front of vp. The isometric lines are angled at 30 the lines not parallel to axes 1, 2 and 3 are nonisometric lines. Principles of orthographic projections, conventions, first and third angle projections, projection of points, projection of lines, lines inclined to single plane, lines inclined to both the planes, true lengths and traces.
This experiment is designed to familiarize you with the concept of force as a vector quantity. A line inclined to both hp and vp pictorial presentation 5. Line inclined to one plane and parallel to the other plane. All lines parallel to axes 1, 2 and 3 are isometric lines.
Projection of lines projection of intersecting lines when the lines are intersecting, the point of intersection lies on both the lines and hence these lines have no shortest distance between them. For any other position first assume the given line parallel to both the planes. The lines in which the planes meet the reference planes i. The end p is both in hp and vp, and 40 mm to the right of lpp. A line pq, 75 mm long lies on hp with its end p at 40 mm in front of vp. Two pieces of information, a trend and a plunge, are necessary to describe the orientation of a line in space. When the line is parallel to both hp and vp, there will be no traces on the said planes. A line pq 75mm long has its end p in both hp and vp. Two lines intersect at a point common to both the lines. Lines inclined to both the reference planes excluding traces of lines and simple application based problems on projection of lines problem 1 based on inclined to. Here we are providing mostly asked mcq pdf of engineering drawing for rrb alptechnician cbt 2 stage exam,it will be provide help to aspirants who are going to appear this exam.
Projections of oblique planes are obtained in three stages. The planes which are inclined to both the reference planes i. In two adjacent views the end points of the segment lie on projection lines that. Lines perpendicular to one plane and parallel to the other. Line inclined to both hp and vp problem 1 a line cd measuring 80mm is inclined at an angle of 30 to hp and 45 to vp. Projection of straight lines only first angle projections inclined to both the principal planes determination of true lengths and true inclinations by rotating line method and traces projection of planes polygonal and circular surfaces inclined to both the principal planes by rotating object method. Draw the projections of ab and show its inclinations with the h. Tips for projection of straight linesiiinclined to both planes. It is used to draw circles and arcs both in pencil and ink. Engineering drawing mostly asked mcq pdf part five for rrb.137 892 189 569 913 367 870 1083 1386 674 767 961 954 1108 1050 1434 465 820 21 1282 1499 920 24 55 1207 1519 209 1435 324 400 1351 540 1040 1012 772 134 551 895