Engineering Drawing Multiple Choice Questions

In Engineers scales, designation M5 indicates the scales ____________

1. 1 : 200
2. 1 : 10
3. 1 : 50
4. 1 : 400

Answer (Detailed Solution Below)

Option 1 : 1 : 200

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Explanation:

Scales are used to make drawings of the objects to the proportionate size desired.

A scale is defined as the ratio of the linear dimensions of element of the object as represented in drawing to the actual dimensions of the same element of the object itself.

In this case, the relation between the dimension on the drawing and the actual dimension of the object is mentioned numerically in the style as 10 mm = 5m, etc.

BIS recommends eight set-scales in plastic/cardboard with designations MI, M2 and so on as shown in table.

Designation	The scale on one edge	The scale on another edge
M1	1: 1	1: 2
M2	1: 2.5	1: 5
M3	1: 10	1: 20
M4	1: 50	1: 100
M5	1: 200	1: 500
M6	1: 300	1: 600
M7	1: 400	1: 800
M8	1: 1000	1 : 2000

What is the dimension of A1 size drawing sheet?

1. 1189 mm × 841 mm
2. 594 mm × 841 mm
3. 1230 mm × 880 mm
4. 880 mm × 625 mm

Answer (Detailed Solution Below)

Option 2 : 594 mm × 841 mm

Explanation:

Dimensions in "mm" for different sizes of drawing sheets are as follows:

Paper Sizes	Dimension (mm × mm)
A0	841 × 1189
A1	594 × 841
A2	420 × 594
A3	297 × 420
A4	210 × 297
A5	148 × 210

The _____ drawing shows how the components are added to their proportions.

1. Layout assembly
2. General assembly
3. Working drawing assembly
4. Design assembly

Answer (Detailed Solution Below)

Option 1 : Layout assembly

Type Of Assembly Drawing:

Design assembly drawing: Drawing made at the time of design stage on large scale.

Layout assembly drawing: Drawing shows how the part to be assembly with their basic proportions and dimension.

Installation drawing: In this drawing how to install or erect a machine or structure is highlighted. Dimension of a few important part overall dimension of assembled unit is indication.

Working assembly drawing: Working drawing of machine consist of detail drawing giving all necessary information for the production of individual parts, and assembly drawing shows the location of each component of the machine.

General assembly drawing: Show the detail drawing of the individual part, sum-assembly and the assembly drawing of the machine.

The standard size of drawing board of designation D₁ is (in mm)

1. 1000 × 700 × 25
2. 100 × 75 × 25
3. 1500 × 750 × 25
4. 1500 × 700 × 25

Answer (Detailed Solution Below)

Option 1 : 1000 × 700 × 25

• The drawing board is required to provide a flat surface
• The surface must be smooth and soft so that a pencil can easily draw lines
• It should be free from bumps or holes
• It isrectangularandis made up ofwell-seasoned softwood strips (such as pine, fir, oak or kail) about 25 mm thick of masonite glued together at the bottom
• Two battens are provided to prevent warping and permit expansion or contraction due to change in the atmosphere
• One of the shorter edges of the drawing board is provided with 'ebony edge' on which stock of the T square slides

S. No	Designation	Size in mm Length × Width × Thickness	To be used with sheet sizes
1.	D0	1500 × 1000 × 25	A0
2.	D1	1000 × 700 × 25	A1
3.	D2	700 × 500 × 15	A2
4.	D3	500 × 350 × 15	A3

The Length : Width in case of an arrow head is

1. 1 : 1
2. 2 : 1
3. 3 : 1
4. 4 : 1

Answer (Detailed Solution Below)

Option 3 : 3 : 1

Explanation:

Dimension line terminations: The dimension line will have terminations in the form of arrowheads or oblique strokes.

Arrow head:An arrowhead is placed at each end of a dimension line. Its pointed end touches an outline and extension line or center line. The arrow head may be open, closed or closed an filled in open type arrowhead is preferred for fast execution.

Note:

• Thelength of the arrowheadis approximately3 times the width.
• The size of the arrowhead should be proportional to the thickness of the outline.

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Which of the following views provide clear information of internal features of a part?

1. Pictorial views
2. Section views
3. Oblique views
4. Auxiliary views

Answer (Detailed Solution Below)

Option 2 : Section views

Explanation:

Sectional view:

Section lines or cross-hatch lines are added to a section view to indicate the surfaces that are cut by the imaginary cutting plane.

It gives a clear representation of internal features of the part

Additional Information

Pictorial Projection: A pictorial view gives the information regarding the general shape of the object.

Oblique Projection:These are least realistic. Only one or two faces in oblique projections have true shape and size. There are three types of oblique projections: cabinet, cavalier and general.

 Symbol in a drawing represents

1. Perspective projection

2. Third angle projection
3. First angle projection
4. Oblique projection

Answer (Detailed Solution Below)

Option 3 : First angle projection

Explanation:

First angle projection	Third-angle projection
Object is kept in the first quadrant	An object is assumed to be kept in the third quadrant
Object lies between the observer and the plane of the projection	A plane of projection lies between the observer and the object
The plane of projection is assumed to be Non-transparent	The plane of projection is assumed to be transparent.
Front (elevation) view is drawn above the XY line	Front (elevation) view is drawn below the XY line
Top (plan) view is drawn below the XY line	Top (plan) view is drawn above the XY line
Left view is projected on the right plane and vice versa	Left view is projected on the left plane itself
Followed in India, European countries	Followed in the USA

Perspective Projection: The type of pictorial projection in whichall the projectors converge or meet at a point is known as PERSPECTIVE PROJECTION. Perspective drawing has been used by artists and is still used to illustrate the three-dimensional figure. It does not represent the actual size of the object but gives the general outlook.

Oblique Projection: The type of pictorial projection inwhich one face of the object is parallel to the plane of projection and adjacent face is inclined at an angle of 45° to the plane of projection is known as OBLIQUE PROJECTION.

In Oblique projection, projectors from an object are parallel to each other and _________ to the plane of projection.

1. Inclined
2. Perpendicular
3. Parallel
4. Cross

Answer (Detailed Solution Below)

Option 1 : Inclined

Concept:

In oblique projection, the object is aligned such that one face (front face) is parallel to the projection plane.

In such projection, the projectors are not perpendicular to the plane of projection rather inclined to the plane of projection at 30˚, 45˚ or 60˚.

Here oblique axis is called as receding axis. In oblique projection, projectors from various points on the object are down parallel to each other and inclined to the plane of projection.

In computer aided drafting practice, an arc is defined by

1. Two end points only
2. Center and radius
3. Radius and one end point
4. Two end points and center

Answer (Detailed Solution Below)

Option 4 : Two end points and center

Concept:

An arc can be created by

1. Specifying three points
2. Start point, center, and endpoint
3. Start point, center, and an included angle
4. Start point, endpoint, and a radius etc

The exact value of R.F. on an isometric scale is

1. 0.815
2. 0.8165
3. (2/3)^1/2
4. 9/11

Answer (Detailed Solution Below)

Option 3 : (2/3)^1/2

Representation Factor (R. F)

\({\rm{R}}.{\rm{F}} = {\rm{}}\frac{{{\rm{Length\;of\;object\;on\;drawing}}}}{{{\rm{Actual\;length\;of\;the\;object}}}} = \frac{{\cos 45^\circ }}{{\cos 30^\circ }} = \frac{{1/\sqrt 2 }}{{\sqrt 3 /2}} = \sqrt {\frac{2}{3}} \)

Projection of an object shown by three views is known as

1. Oblique
2. Orthographic
3. Isometric
4. Perspective

Answer (Detailed Solution Below)

Option 2 : Orthographic

Explanation:

Isometric projection is a type of pictorial projection in which the dimensions along the three axes of the solid are shown in one view and in true size.

Orthographic projection:

• The projection or view obtained on a plane of projection when the projectors are parallel to each other but perpendicular to the plane of projection is known as orthographic projection.
• 
• The following two types of orthographic projection are used in engineering practice: (1) First Angle Projection  (2) Third Angle Projection
• The front view reveals the two dimensions, namely the length and the height of an object.
• The top view reveals the length and the other dimension (i.e., the width of the object).
• The side view reveals the height/depth and the width of the object (i.e., the length of the object).
• Thus the orthographic view represents the projection of an object by three views.

A cone resting on its base in horizontal plane (HP) is cut by a plane inclined to the axis and parallel to one of its generators, the sectional view will be

1. Ellipse
2. Parabola
3. Hyperbola
4. Circle

Answer (Detailed Solution Below)

Option 2 : Parabola

Explanation:

Geometrical properties of cone:

A cone on its base in the horizontal plane (HP) and all generators is cut by plane:

1. Inclined to the axis of a cone (more than the angle between slant and cone axis) → Ellipse section will form
2. Inclined to the axis of a cone (less than the angle between slant and cone axis) → Hyperbola section will form
3. Parallel to the generators (equal the angle between slant and cone axis) → Parabolasection will form
4. Parallel to the horizontal plane (perpendicular to the cone axis) → Circular section will form

Hidden lines are drawn as

1. dashed narrow lines
2. dashed wide lines
3. long-dashed dotted wide line
4. long-dashed double dotted wide line

Answer (Detailed Solution Below)

Option 1 : dashed narrow lines

No.	Line description and representation	Application
1.	Continuous narrow lines	1. Imaginary lines of intersection 2. Dimension lines 3. Extension lines 4. Construction Line 5. Leader lines and reference lines 6. Hatching 7. Outlines of revolved sections 8. Dimension line terminations 9. Diagonals for the indication of flat surfaces 10. Projection lines 11. Grid lines
	Continues freehand lines	11. Preferably manually represented the termination of partial or interrupted views, cuts 8. sections, if the limit is not a line of symmetry or a centre line-
	Continues narrow line with zigzags	12. Preferably mechanically represented the termination of partial or interrupted views, cuts and sections, if the limit is not a line of symmetry or a centre line.
2.	Continues wide lines	1. Visible edge 2. Visible outlines 3. Crests of screw threads 4. Main representation in diagrams, maps, flow chats 5. Systems lines (structural metal engineering)
3.	Dashed narrow lines	1. Hidden edges 2. Hidden outlines
4.	Dashed wide lines	1. An indication of permissible areas of surface treatment
5.	Long-dashed dotted narrow lines	1. Center lines 2. Lines of symmetry 3. Pitch circle of gears 4. Pitch circle of holes
6.	Long-dashed dotted wide lines	1. An indication of (limited) required areas of surface treatment, e.g. heat treatment 2. indication of cutting planes

The internal angle of regular hexagon is ______ degree.

1. 72
2. 108
3. 120
4. 150

Answer (Detailed Solution Below)

Option 3 : 120

Which type of line is part of a dimension?

1. short break lines
2. phantom lines
3. extension lines
4. cutting plane lines

Answer (Detailed Solution Below)

Option 3 : extension lines

Explanation:

Short break line:

It is represented by a thin free–hand line that is used to show the break of an object for a short length.

Dimension line:

It is a thin continuous line used for giving dimensions.

The line terminates in arrow-head where the dimension lines meet the extension lines.

Extension line

It is a thin continuous line used for dimensioning an object.

Phantom lines:

Phantom lines are thin lines used to indicate alternate positions of the parts of an object, repeated detail or the locations of absent parts. They are made by alternating one long and two evenly spaced, short dashes, with a long dash at each end.

The internal angle of regular pentagon is __________ degree.

1. 72
2. 108
3. 120
4. 150

Answer (Detailed Solution Below)

Option 2 : 108

Internal Angle and External Angle can be seen in the diagram below.

For orthographic projections, BIS recommends the following projections.

1. Fourth-angle projection
2. Third-angle projection
3. First-angle projection
4. Second-angle projection

Answer (Detailed Solution Below)

Option 3 : First-angle projection

For orthographic projections, BIS recommends the First-angle projection.

First angle projection	Third-angle projection
The object is kept in the first quadrant	An object is assumed to be kept in the third quadrant
Object lies between the observer and the plane of the projection	A plane of projection lies between the observer and the object
The plane of projection is assumed to be Non-transparent	The plane of projection is assumed to be transparent.
Front (elevation) view is drawn above the XY line	Front (elevation) view is drawn below the XY line
Top (plan) view is drawn below the XY line	Top (plan) view is drawn above the XY line
Left view is projected on the right plane and vice versa	Left view is projected on the left plane itself
Followed in India, European countries	Followed in the USA

Isometric projection of a sphere is

1. Circle
2. Ellipse
3. Hyperbola
4. Parabola

Answer (Detailed Solution Below)

Option 1 : Circle

Explanation:

• In the case of isometric projection, three-dimensional objects are represented visually in two dimensions in technical and engineering drawing.
• An isometric view of an object can be obtained by choosing the viewing direction such that the angles between the projections of the x, y, and z axes are all the same, or 120°.

The isometric projection of a sphere is a circle.

When a sphere is viewed in any direction, its shape will be a circle of radius equalt to the actual radius of the sphere. Hence, the isometric projection of the sphere will be a circle of radius equal to the actual radius of the sphere.

• Other options like the ellipse, hyperbola, and parabola are called conic sections as they are obtained from the sections of a cone at various conditions as shown below-

Additional Information

ELLIPSE:

• To get an ellipse the conditions are-
• β < α
• The cutting plane should pass through all generators.

PARABOLA:

• To get a parabola the conditions are-
• β = α
• The cutting plane should be parallel to the generators.

HYPERBOLA:

• To get a parabola the conditions are-
• β > α

Drawing showing the position of each part with respect to each other is called _______

1. assembly drawing
2. part drawing
3. machine drawing
4. installation drawing

Answer (Detailed Solution Below)

Option 1 : assembly drawing

Explanation:

A machine comprises of many parts joined together. A working drawing supplies information and instructions for the manufacturing of machines. Working drawing can be classified as Detailed drawing and Assembly drawing.

Assembly drawing is prepared from the part drawings and informs the relative position of parts. They usually indicate overall dimensions, center to center dimensions, dimensions between parts, operating instructions, etc. There are the following types.

• Design Assembly drawing: It is prepared at the design stage while developing a machine.
• Detailed Assembly drawing: It is made for simple machines having less number of parts.
• Sub-Assembly drawing: It is drawn when a machine has large number of parts.
• Installation Assembly drawing: It gives dimensions important from the installation's point of view.
• Catalog Assembly drawing: It is specially prepared for catalog of a company to create interest in the product by the potential buyer.
• Exploded Assembly Drawing: It helps a reader in clearly visualizing each part.

Detailed drawing provides information about shape with enough number of views, size with tolerance, geometrical tolerances, datum, specifications about surface texture, heat treatment, and additional information, etc.

In a rectangular hyperbola, if a curve is traced out by a point moving in such a way that the product of its distances from two fixed lines at right angles to each other is a constant, then those fixed lines are called

1. asymptotes
2. intercepts
3. holes
4. limits

Answer (Detailed Solution Below)

Option 1 : asymptotes

Rectangular Hyperbola:

• If in a hyperbola the length of the transverse axis 2a is equal to the length of the conjugate axis 2b, the hyperbola is called a rectangular hyperbola.
• x2− y2= a2 is the general form of rectangular hyperbola. If the asymptotes are x and y axis, then the equation is xy = c2
• The rectangular hyperbola is the hyperbola for which the axes (or asymptotes) are perpendicular, or witheccentricity √2

Asymptotes are fixed lines or tangents of rectangular hyperbola, which meets at infinity. If a curve is traced out by a point moving in such a way that the product of its distances from two fixed lines at right angles to each other is a constant.

Here, xy = Constant

Equation of asymptotes is given by,\(y=\pm \frac{b}{a}x\)

Intercepts is the y-value of the point where it crosses the y-axis. In the x-y plane of hyperbola, you will have either x-intercept or y-intercept but never both. If the origin of coordinates is at the centre of hyperbola, the intercepts will be zero.

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Source: https://testbook.com/objective-questions/mcq-on-engineering-drawing--5eea6a1439140f30f369f2cd

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