EG
UNIT 2INTRODUCTION TO 2D AND 3D1. Fill-in the blanks with appropriate words selected from the list given below:(a) Writing of titles, notes etc. on a drawing is called ___________(b) Efficiency in the art of lettering is achieved by continuous___________(c) Lettering should be in plain and simple style so that it could be done __________and___________.(d) For maintaining uniformity in size, thin and light____________ may first be drawn.(e) All letters should be uniform in _________, _________, __________, _________ and _________(f) The inclined letters slope to the__________ at an angle of__________ degrees. 2. What are the two systems of placing dimensions on a drawing? Illustrate youranswer with sketches. 3. Show by sketches the difference between (i) continuous or chain dimensioningand (ii) progressive or parallel dimensioning. What are the advantages of oneabove the other? 4. Draw a line 125 mm long and quadrisect it. 5. Draw a line AB 80 mm long and divide it into five parts, one of them 20mm long and the remaining each 15 mm long, by the method of bisection. 6. Draw a line AB 75 mm long. At B, erect a perpendicular BC 100 mm long.Draw a line joining A and C, and measure its length. Construct a square oneach line as a side. 7. Draw a line PQ 100 mm long. At any point O in it near its center, erect aperpendicular OA 65 mm long. Through A, draw a line parallel to PQ. 8. Construct a square of 75 mm side. Draw the diagonals intersecting at 0. From 0,draw lines perpendicular to the sides of the square. 9. Draw two lines AB and AC making an angle of 75°. Draw a circle of 25 mmradius touching them. 10. Draw a line AB of any length. Mark a point O at 25 mm fromAB. With O as centre, draw a circle of 40 mm diameter. Describe anothercircle (i) of 20 mm radius, touching the circle and AB; (ii) of 35 mm radius,touching AB and the circle, and including the circle within it.
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