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51.	A circular lamina inclined to the VP appears in the front view as an ellipse of major axis 30mm & minor axis 15 mm. The major axis is parallel to both HP and VP. One end of the minor axis is in both the HP and VP. Determine the inclination of the lamina with the VP.(a) 45^o(b) 90^o(c) 60^o(d) 105^oI have been asked this question in an online interview.Question is taken from Projections of Planes topic in division Orthographic Projection, Projections of Lines, Planes and Solids of Civil Engineering Drawing
Answer» The CORRECT choice is (C) 60^o Easiest explanation: On measuring the VALUE of φ by MAKING the PROJECTION, its value is found.

52.	Planes which are inclined to both the reference planes are called __________(a) vertical planes(b) inclined planes(c) horizontal planes(d) oblique planesThis question was posed to me in an internship interview.I need to ask this question from Projections on Auxiliary Planes topic in division Orthographic Projection, Projections of Lines, Planes and Solids of Civil Engineering Drawing
Answer» RIGHT choice is (d) oblique planes To explain I would SAY: Oblique projection is a simple TYPE of technical DRAWING of graphical projection used for producing two-dimensional images of three-dimensional objects. The objects are not in perspective, so they do not correspond to any view of an object that can be obtained in practice, but the technique does yield somewhat convincing and useful images. The plane at which these activity occur refers to as Oblique planes.

53.	If the front view of a line is parallel to the xy line, its perpendicular length can be ___________(a) front view(b) top view(c) side view(d) no front viewI got this question by my college director while I was bunking the class.My doubt stems from Projection of Straight Lines in chapter Orthographic Projection, Projections of Lines, Planes and Solids of Civil Engineering Drawing
Answer» Right option is (d) no FRONT view The explanation: Since in both these cases line will be parallel to both the planes and so no perpendicular will FALL on any of them HENCE NEITHER top nor front views will be formed.

54.	What does the red area formed on the plane represents?(a) Extrusion(b) Shadow(c) Reflection(d) ProjectionI have been asked this question at a job interview.I would like to ask this question from Orthographic Reading topic in chapter Orthographic Projection, Projections of Lines, Planes and Solids of Civil Engineering Drawing
Answer» Correct option is (d) Projection The explanation: It represents projection on the intersected plane of an OBJECT. The rays of sight are extended further to meet perpendicularly a vertical plane or horizontal plane THUS forming the RED area (in TH fig.) on the planes.

55.	Front view will be projected on which plane if it is lying in the 3rd coordinate?(a) 2nd plane(b) 3rd plane(c) 1st plane(d) All the planesI have been asked this question in an online interview.This interesting question is from Orthographic Reading in section Orthographic Projection, Projections of Lines, Planes and Solids of Civil Engineering Drawing
Answer» Right choice is (a) 2nd PLANE The EXPLANATION: As it lies in the 3rd QUADRANT it will show third-angle projection. When the observer views the object from the front, the RAYS of sight intersect the V.P. as object is between observer and plane and so according to figure above front VIEW will intersect the 2nd plane.

56.	Which statement is true regarding the figure given below?(a) Full section view, where the section plane go completely through the object(b) Half section view, where the section plane go half-way through the object(c) Offset section, where the sectional plane bent through the features that are not aligned(d) Broken-out section where the section go through part of the objectThis question was posed to me in class test.Question is from Sections of Solids in division Orthographic Projection, Projections of Lines, Planes and Solids of Civil Engineering Drawing
Answer» Right choice is (d) Broken-out section where the section go through part of the object To elaborate: A broken-out section view cuts away a portion of an assembly in a drawing view to EXPOSE the inside. CROSS hatching is automatically generated on the sectioned faces of all components. A broken-out section is part of an existing drawing view, not a separate view. A closed profile, usually a SPLINE, defines the broken-out section. Material is removed to a specified depth to expose inner details. Specify the depth by setting a number or by selecting geometry in a drawing view. You cannot create a broken-out section on a DETAIL, section, or alternate position view. If you create a broken-out section of an exploded view, you cannot collapse the exploded view.

57.	Which types of prism does the 5th figure represents?(a) Triangular(b) Square(c) Pentagon(d) RectangularThe question was asked in an online quiz.The above asked question is from Projections of Solids in section Orthographic Projection, Projections of Lines, Planes and Solids of Civil Engineering Drawing
Answer» The correct answer is (d) Rectangular To elaborate: In geometry, a cuboid is a convex POLYHEDRON bounded by six quadrilateral FACES, whose polyhedral graph is the same as that of a cube. While mathematical literature refers to any such polyhedron as a cuboid, other sources use “cuboid” to refer to a shape of this TYPE in which each of the faces is a rectangle (and so each pair of adjacent faces meets in a right angle); this more restrictive type of cuboid is ALSO known as a rectangular cuboid, right cuboid, rectangular box, rectangular hexahedron, right rectangular PRISM, or rectangular parallelepiped.

58.	A hexagonal lamina of 30 mm sides rests on HP with one of its corners touching VP and the surface inclined at 45 deg. to it. One of its edges inclined to HP at 30 deg. What will be the value of α?(a) 32.31°(b) 42.32°(c) 52.32°(d) 62.32°This question was posed to me in final exam.Origin of the question is Projections of Planes topic in portion Orthographic Projection, Projections of Lines, Planes and Solids of Civil Engineering Drawing
Answer» Right choice is (a) 32.31° The best I can EXPLAIN: Referring the FIGURE below, on MEASURING the value of α, INCLINATION is known.

59.	An equilateral triangular lamina of 25 mm sides lies with one of its edges on HP such that the surface of the lamina is inclined to HP at 60 deg. The edge on which it rests is inclined to VP at 60 deg. How many lines with 3 coordinates will appear during the projection?(a) 5(b) 6(c) 3(d) 2I have been asked this question during an interview.I want to ask this question from Projections of Planes in chapter Orthographic Projection, Projections of Lines, Planes and Solids of Civil Engineering Drawing
Answer» RIGHT OPTION is (d) 2 Easiest explanation: Lines above XY line i.e. a’B’(c’) representing lines are the required lines, refer the figure below.

60.	Auxiliary views tend to make use of ___________ projection.(a) orthographic projection(b) axonometric projection(c) oblique projection(d) isometric projectionThis question was addressed to me by my school principal while I was bunking the class.This interesting question is from Projections on Auxiliary Planes topic in division Orthographic Projection, Projections of Lines, Planes and Solids of Civil Engineering Drawing
Answer» The CORRECT answer is (b) axonometric projection The explanation: Axonometric projection is a type of ORTHOGRAPHIC projection used for creating a PICTORIAL drawing of an object, where the lines of sight are perpendicular to the plane of projection, and the object is rotated around ONE or more of its axes to reveal multiple sides.

61.	A straight line is the ___________ distance between two points.(a) shortest(b) longest(c) half(d) infiniteI got this question in quiz.My question comes from Projection of Straight Lines in portion Orthographic Projection, Projections of Lines, Planes and Solids of Civil Engineering Drawing
Answer» Correct ANSWER is (a) shortest Explanation: As we KNOW lines are formed by POINTS and shortest line which can be formed is the STRAIGHT line between two points. Hence, the projections of a straight line may be drawn by joining the RESPECTIVE projections of its ends which are points.

62.	Which types of prism does the 6rd figure represents?(a) Triangular(b) Square(c) Pentagon(d) ObliqueI got this question by my college professor while I was bunking the class.I would like to ask this question from Projections of Solids topic in portion Orthographic Projection, Projections of Lines, Planes and Solids of Civil Engineering Drawing
Answer» RIGHT answer is (d) Oblique The best I can explain: A prism with bases that are not aligned one DIRECTLY above the other. NOTE: The lateral FACES of an oblique prism are parallelograms. Refer the figure b below.

63.	What are non-parallel and non-intersecting lines called?(a) Spiral lines(b) Parallel lines(c) Skew lines(d) Perpendicular linesThe question was posed to me in an online quiz.My query is from Projections on Auxiliary Planes in division Orthographic Projection, Projections of Lines, Planes and Solids of Civil Engineering Drawing
Answer» The correct option is (c) Skew LINES The explanation: A SIMPLE example of a pair of skew lines is the pair of lines through opposite edges of a regular tetrahedron. Two lines that both lie in the same plane must EITHER cross each other or be parallel, so skew lines can exist only in three or more dimensions. Two lines are skew if and only if they are not coplanar. REFERRING the figure below, here the line through SEGMENT AD and the line through segment B1B are skew lines because they are not in the same plane.

64.	Any object can be viewed from_________ mutually perpendicular views.(a) Two(b) Four(c) Three(d) SixI had been asked this question during an interview for a job.This intriguing question comes from Orthographic Reading topic in portion Orthographic Projection, Projections of Lines, Planes and Solids of Civil Engineering Drawing
Answer» The CORRECT option is (d) Six To explain I would say: The front, top, and right-SIDE VIEWS are commonly considered the core group of views included by default, but any COMBINATION of views may be used DEPENDING on the needs of the particular design, these are – front, back, top, bottom, right side, left side views.