Chapter 3-Pictorial drawings J PICTORIAL DRAWINGs QUESTIONS Name: Q3-1) A Date l

Question

Chapter 3-Pictorial drawings J PICTORIAL DRAWINGs QUESTIONS Name: Q3-1) A Date looks pictorial drawing is a two-dimensional rendering of a part, but the drawing still (Fill in the blank) Q3-2) Pictorials help us... (Circle all that apply.) a) be expressive. b) visualize a part or assembly. c) ideas. Q3-3) A pictorial may be included on a detailed drawing. (true, false) Q3-4) List the three different types of axonometric projections? Q3-5) List the three different types of oblique projections? Q3-6) List the three different types of perspective projections? Q3-7 Why is developing the ability to sketch pictorials by hand important? 3.39

Explanation / Answer

Answer 1:

Pictorial view is a three-dimesnioned or a realistic view of an objected. The object in pictorial drawings is usually viewed from a specific angle which includes all the three dimensions of the object. Pictorial view helps us represent and visualize how an object looks in actual reality.

So the answer would be,

A pictorial drawing is a two-dimensional rendering of a part, but the drawing still looks three dimensional.

Answer 2:

a) Being expressive means how you convey your thoughts or feelings. Pictorial view represents nothing more thanthe actual image of the picture. Hence, this statement is not applicable.

b) Pictorial view represents how an object looks like in actual reality and hence is helps us in visualizing an object. Hence, this statement is applicable.

c) Pictorial view only gives us a visualization of the object being studied. It does not provide any further ideas apart from that. Hence communicating ideas is also not applicable.

So the answer is, option (b).

Answer 3:

A detailed drawing is an engineering drawing which represents all the three projections of an object on the top, side and front plane of views. Although this is not necessary, but it is normal to include an isometric view of an object in the detailed drawing to better visualize the part assembly.

Hence, the statement is true.

Answer 4:

Axonometric view is a type of pictorial view where the image of an object in any projection plane is rotated about any axis. This rotation along an axis introduces the view of the third dimension which is usually hidden in an orthographic view. The degree of the rotation of an axis with respect to the other 2 axes determines the type of axonometric view. There are generally three types of axonometric views:

1) Isometric view: Isometric view is obtained by rotating the axes plane in such a way that the angle between the projection of x, y and z would be equal to 120 degrees. All the three dimensions are equally foreshortened in this view.

2) Dimetric view: Dimetric view is obtained by rotating the axes plane in such a way that the only two angle of projections are equal. This way only two dimensions are equally foreshortened.

e.g, angle between x axis and y axis be 100 degrees, between x and z be 130 degrees, and between y and z be 130 degrees.

3) Trimetric view: In this view all the three dimesnions are unequally foreshortened due to unequal angles of projections of the x, y and z axes.

e.g, angle between x and y axis be 70 degrees, between x and z be 140 degrees, and between y and z be 150 degrees.

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