What do you understand by Scale 5 and Scale 1 100 Explain. Sketch the conventional representation of the following:
External threads
Internal threads

(iii) Bearing
Compression spring

2.(a) List the six possible orthographic projections that may be obtained for an object in space. Specify their relative positions.
Draw the sectional view from the front, and the view from above of the Vice Body shown in Figure 1. <img src='./qimages/9071-2b.jpg'>

3.(a) Draw the three views of a hexagonal headed bolt of nominal diameter 25 mm and length 100 mm with a hexagonal nut and washer.
What are the uses of flexible couplings? Describe in brief.

4.(a) Differentiate between lap joint and butt joint. Through sketches, illustrate the chalking and fullering operations.

(c) What is a production drawing of a component? Describe in brief.

5.(a) In how many different ways can a circle be drawn in AutoCAD List the commands for each.

(b) When is a projection of an object called an orthographic projection? Discuss in brief.

6. Details of a screw jack are given in the Figure 2. Draw the front view full in section for the assembly. <img src='./qimages/9071-6.jpg'> <img src='./qimages/9071-table.jpg'>