Engineering Drawing COMPLETE KEY ANSWERS Engineering Drawing COMPLETE KEY ANSWERS PDF

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Prelims:This method is used where a number of dimensions have a common datum feature. Answer: Parallel dimensioning Inclined and curved lines are drawn from________. Answer: top to bottom It should be used only where the possible accumulation of tolerances does not endanger the fundamental requireme...

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Prelims: This method is used where a number of dimensions have a common datum feature. Answer: Parallel dimensioning Inclined and curved lines are drawn from________. Answer: top to bottom It should be used only where the possible accumulation of tolerances does not endanger the fundamental requirement of the component. Answer: Chain dimensioning Wavy continuous narrow line drawn freehand is used to represent break of an object. Answer: Break Lines: Type 01.1 (Continuous Narrow Freehand Lines) Pencils for construction lines, Dimension lines, Leader lines, Extension lines, Center lines, Hatching lines and Hidden lines. Answer: 2H hard grade

These are provided through the distances between the surfaces, location of holes, nature of surface finish, type of material, etc. The expression of these features on a drawing, using lines, symbols, figures and notes is called ___________. Answer: dimensioning Pencils for visible outlines, visible edges and boundary lines. Answer: H medium grade Which instruments and other aids are not used in draughting work? Answer: None of the choices Spacing between words = e = _________. Answer: (6/10)b Which instrument are not included in Instruments Box? Answer: None of the choices It is a two-dimensional representation of threedimensional objects. In general, it provides

necessary information about the shape, size, surface quality, material, manufacturing process, etc., of the object. Answer: Engineering Drawing It is drawn for the sectioned portion of an object. These are drawn inclined at an angle of45° to the axis or to the main outline of the section. Answer: Hatching / Section Lines: Type 01.1 (Continuous Narrow Lines) It combines the functions of T-square, set-squares, scales and protractor. It is used for drawing horizontal, vertical and inclined lines, parallel and perpendicular lines and for measuring lines and angles. Answer: Mini-Draughter Means line thickness Answer: Line width Spacing between characters = a = _________. Answer: (2/10)b

These are aids used for drawing small features such as circles, arcs, triangular, square and other shapes and symbols used in various science and engineering fields. Answer: Templates Pencils for Border lines, lettering and free sketching Answer: HB soft grade Engineering drawing is called the _______ language of engineers. Answer: Universal Straight continuous narrow line with zigzags is used to represent break of an object. Answer: Break Lines: Type 01.1 (Continuous Narrow Lines With Zigzags) A curve consists of a lead bar inside rubber which bends conveniently to draw a smooth curve through any set of points. Answer: Flexible curve

A curve generated by a fixed point in the circumference of a circle when it rolls without slipping along a fixed straight line or circular path. Answer: Cycloidal Curves To communicate electric connections, position of switches and load, polarities etc electric circuit diagram is very necessary. Answer: True It is formed when a right-angled triangle with an apex and angle Θ is rotated about its altitude as the axis. The length or height is equal to the altitude of the triangle and the radius of the base is equal to the base of the triangle. Answer: Cone RF stands for Representative Fraction. Answer: True Objects which are very big in size can be represented in drawing to full size. Answer: False

Drawing small objects such as watch parts, instrument components etc., use of full scale may not be useful to represent the object clearly. Answer: True We can use compass and scale to draw triangle. Answer: True Engineering drawings are usually created in accordance with standardized conventions for layout, nomenclature, interpretation, appearance, line styles, size, etc. Answer: True It is a curve traced by a point on a perfectly flexible string, while unwinding from around a circle or polygon the string being kept taut (tight). Answer: involute It is a curve traced by a point moving such that the sum of its distances from the two fixed points, foci is constant and equal to the major axis. Answer: Ellipse

Diagonal scales are used to represent either three units of measurements such as metres, decimetres, centimetres or to read to the accuracy correct to two decimals. Answer: True Hexagon has seven sides. Answer: False When a cone is cut by a section plane A-A making an angle a = 90° with the axis. Answer: Circle A plain scale is simply a line which is not divided into a suitable number of equal parts, the first of which is not further sub-divided into small parts. Answer: False Quadrilateral has four sides. Answer: True A curve finds its application for reflecting surfaces of light, Arch forms, cable forms in suspension bridges, wall brackets of uniform strength, etc.

Answer: Parabolic Curve When 1 vsd> 1 or (1+ lin), It is called backward or retrograde Vernier. Answer: True If the angle a is equal to Θ i.e., when the section plane C-C is parallel to the slant side of the cone. Answer: Parabola We can also calculate the area of irregular shape by drawing many big size square and triangles into the drawing. We can add area of all these squares and triangles to get area of the irregular shape. Answer: True Using compass, scale, sets square ( 30 – 60, 45-45), protractor are used to draw basic geometrical shapes. Answer: True Plain scales are used to read lengths in two units such as metres and decimetres, centimetres and

millimetres etc., or to read to the accuracy correct to first decimal. Answer: True When the asymptotes to the hyperbola intersect each other at right angles. Answer: Rectangular Hyperbola Sum of angles of quadrilateral is 90 degree . Answer: False In regular practice, we need to measure irregular shapes of land, construction area, material etc. Graphical method is used to calculate area of such irregular shapes. Answer: True The least count (LC) is the smallest dimension correct to which a measurement can be made with a vernier. Answer: True

A curve traced by a point on the circumference of a generating circle, when it rolls inside the directing circle. Answer: hypo-cycloid A hyperbola is a curve generated by a point moving such that the difference of its distances from two fixed points called _____ is always constant and equal to the distance between the vertices of the two branches of hyperbola. Answer: foci The Vernier scale is a long auxiliary scale constructed along the plain or main scale, which can read up to two decimal places. Answer: False To drawn engineering drawing or map on a small piece of paper, we don’t need scale. Answer: False When 1vsd < 1 it is called forward or direct vernier. Answer: True

Midterms: The Projections in which the description of the object is completely understood in one view is known as plane projection. Answer: False The number of views required to describe an object depends upon the extent of complexity involved in it. The higher the symmetry the lesser the number of views required to be drawn. Answer: True As per the optical physics, an object is seen when the light rays called visual rays coming from the object strike the observer’s eye. Answer: True ‘PICTORIAL’ means right angle and orthographic means right angled drawing. Answer: False

It has eight equal faces, each an equilateral triangle. Answer: Octahedron Auxiliary views may be classified, based on the relation of the inclined surface of the object with respect to the principal planes of projections. Answer: True When the planes of projections are extended beyond their line of intersection, they form Four Quadrants. Answer: True It consists of six equal faces, each a square. Answer: Hexa hedron(cube) It has twelve regular and equal pentagonal faces. Answer: Dodecahedron It is defined as a solid bounded by plane surfaces called faces. Answer: Polyhedra

When the projectors are perpendicular to the plane on which the projection is obtained, it is known as pictorial projection. Answer: False The size of the image formed in the retina depends on the distance of the observer from the object. Answer: True The position of solid in space may be specified by the location of either the axis, base, edge, diagonal or face with the principal planes of projection. Answer: True The projection on V.P is designated as Top view and the projection on H.P as Front view Answer: False When the axis of solid is parallel to both the planes, neither the front view nor the top view reveals the true shape of the base. Answer: True

The figure or view formed by joining, in correct sequence, the points at which these lines meet the plane is called the projection of the object. Answer: True It consists of four equal faces, each one being a equilateral triangle. Answer: Tetrahedron When the axis of a solid is perpendicular to one of the planes, it is parallel to the other. Also, the projection of the solid on that plane will show the true shape of the base. Answer: True V.P and H.P are called as Principal planes of projection or reference planes. Answer: True Orthographic projection is the standard drawing form of the industrial world. Answer: True Rectangle has two opposite sides of same length.

Answer: True It is a polyhedron having two equal ends called the bases parallel to each other. Answer: prism To draw the development of a square prism of side of base 30mm and height 50mm. First step: Assume the prism is resting on its base on H.P. with an edge of the base parallel to V.P and draw the orthographic views of the square prism. Answer: True It has twenty equal, equilateral triangular faces. Answer: Icosahedron If a plane surface is revolved about one of its edges, the solid generated is called a solid of revolution. Answer: True Sum of angles of quadrilateral is 360 degree. Answer: True When a prism penetrates another prism, plane surface of one prism intersects the plane surfaces of

another prism and hence the lines of intersection will be straight lines. Answer: True Steps to be followed for making objects, using sheet metal EXCEPT. Answer: None of the choices It is used for developing prisms and single curved surfaces like cylinders in which all the edges / generators of lateral surfaces are parallel to each other. Answer: Parallel-line Development In actual practice of Development of Surfaces, allowances have to be given for extra material required for joints and bends. Answer: True A layout of the complete surface of a threedimensional object on a plane is called the ___________. Answer: Development of the surface

The objects such as containers, boxes, boilers, hoppers, vessels, funnels, trays etc., are made of sheet metal by using the principle of development of surfaces. Answer: True Orthographic drawings of lines and curves of intersection of surfaces must not be prepared first for the accurate development of objects. Answer: False First step to draw hexagon of equal side is: Draw a circle of radius equal to side of hexagon. Answer: True If a cone or pyramid is cut by a section plane parallel to its base and the portion containing the apex or vertex is removed, the remaining portion is called frustum of a cone or pyramid. Answer: True In actual practice, allowances have to be given for extra material required for joints and bends.

Answer: True It is a polyhedron having one base, with a number of isosceles triangular faces, meeting at a point called the apex. Answer: pyramid It is employed for pyramids and single curved surfaces like cones in which the apex is taken as center and the slant edge or generator (which are the true lengths) as radius for its development. Answer: Radial-line Development Steps to be followed to make a Development of Pentagonal Pyramid EXCEPT. Answer: Draw the projections of the prism. The higher the symmetry the lesser the number of views required to be drawn. Answer: True When the object is situated in First Quadrant, that is, in front of V.P and above H.P, the projections

obtained on these planes is called First angle projection. Answer: True Projection of planes and of regular solids inclined to one or both the principal planes of projection may be obtained by the use of auxiliary planes. Answer: True The lines or rays drawn from the object to the plane are called _____________. Answer: Projectors The auxiliary view obtained on either AIP or AVP is known as _____________. Answer: primary auxiliary view The Projections in which the description of the object is completely understood in one view is known as ________________. Answer: Pictorial projection The shortest distance between two points is called a_______________ .

Answer: straight line When the projectors are perpendicular to the plane on which the projection is obtained, it is known as ________________. Answer: Orthographic projection When the planes of projections are extended beyond their line of Intersection, they form ______________. Answer: Four Quadrants Finals: The following are the relations between the lines in isometric projection EXCEPT. Answer: None of the choices The extent of reduction of an isometric line can be easily found by construction of a diagram called _____________________. Answer: isometric scale

In an isometric projection or drawing, the lines that are not parallel to the isometric axes are called__________. Answer: non-isometric lines Steps to be followed to make isometric drawing from orthographic views are given below EXCEPT. Answer: None of the choices Perspective projection is also known as ____________. Answer: convergent projection Isometric lines obviously do not appear in their true length on the drawing and cannot be measured directly. Answer: False Oblique projection has the following advantages over isometric drawing EXCEPT. Answer: None of the choices

Solid method of making an isometric drawing is preferred when the object contains irregular curved surfaces. Answer: False For selecting the position of an object for drawing the oblique projection, the rules below are followed EXCEPT. Answer: Draw the face to its true size and shape Methods of Constructing Isometric Drawing EXCEPT. Answer: solid method Oblique projections are classified as cavalier, _______ and general, depending on the scale of measurement followed along the receding lines. Answer: Cabinet It is a pictorial orthographic projection of an object in which a transparent cube containing the object is tilted until one of the solid diagonals of the cube becomes perpendicular to the vertical plane and the three axes are equally inclined to this vertical plane.

Answer: Principle of Isometric Projections If the receding lines are measured to the true size, the projection is known as __________. Answer: cavalier projection If the receding lines are reduced to one half of their true lengths, the projection is called __________. Answer: cabinet projection ___________ are used for presenting ideas which may be easily understood by persons even without technical training and knowledge of multi-view drawing. Answer: Pictorial projections In this method, the object is imagined to be enclosed in a rectangular box and both isometric and non-isometric lines are located by their respective points of contact with the surfaces and edges of the box. Answer: Box method

Drawing of objects are seldom drawn in true isometric projections, as the use of an isometric scale is inconvenient. Answer: True In oblique projection, the front face of the object appears in its true size and shape, as it is placed parallel to the picture plane. Answer: True A convenient method in which the foreshortening of lengths is ignored and actual or true lengths are used to obtain the projections, called ______________ is normally used. Answer: isometric drawing or isometric view It is a method of graphic representation of an object on a single plane called picture plane as seen by an observer stationed at a particular position relative to the object. Answer: Perspective projection

If the principal face of the object viewed, is parallel to the picture plane, the perspective view formed is called __________________ . Answer: Parallel perspective or single point perspective. If the two principal faces of the object viewed are inclined to the picture plane, the perspective view formed is called ___________________ . Answer: Angular perspective or two-point perspective. While selecting the views; the object is placed in such a way the number of hidden lines are kept to maximum. Answer: False This is the imaginary horizontal plane perpendicular to the picture plane and passing through the station point. This plane lies at the level of the observer. Answer: Horizon Plane (H.P.) The following principles of orthographic views are considered in making the drawings EXCEPT.

Answer: None of the choices Top view is drawn seeing the object in a direction is which its length is seen. It is also chosen such that the shape of the object is revealed. Answer: False This is the imaginary plane perpendicular to both the ground plane and the picture plane. It passes through the center of vision and the station point while containing the axis of vision. Answer: Central Plane (C.P.) This is the line drawn perpendicular to the picture plane and passing through the station point. Answer: Axis of Vision (A.V.) This is the line of intersection of the picture plane with the ground plane. Answer: Ground Line (GL.) The number of orthographic views is not required for clear description of the object is taken as the criteria to select the views.

Answer: False If all the three mutually perpendicular principal faces of the object viewed, are inclined to the picture plane, the perspective view formed is called ______________________ . Answer: Oblique perspective or three-point perspective. This is the point through which the axis of vision pierces the picture plane. This is also the point of intersection of horizon line with the axis of vision. Answer: Centre of Vision (C.V.) This is the plane on which the object is assumed to be placed. Answer: Ground Plane (GP.) Perspective projections can be broadly classified into three categories EXCEPT. Answer: Obliqui perspective or one-point perspective.

These are imaginary lines or projectors joining the station point to the various points on the object. Answer: Visual Rays (V.R.) This is the line of intersection of the picture plane with the auxiliary ground plane. Answer: Auxiliary Ground Line (A.GL.) This is any plane parallel to the ground plane. Answer: Auxiliary Ground Plane (A.GP) This is the transparent vertical plane positioned in between the station point and the object to be viewed. Perspective view is formed on this vertical plane. Answer: Picture Plane (P.P.) This is the line of intersection of the horizon plane with the picture plane. This plane is parallel to the ground line. Answer: Horizon Line (H.L.) This is the position of the observer's eye from where the object is viewed.

Answer: Station Point (S.P.)...