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# Projection of lines(new)

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an useful presentation for all 1st year engineering students who are afraid of the subject : ENGINEERING GRAPHICS

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• the front view of a line measures 70mm and makes an angle of 45 degree with xy. A IS IN THE HP and the VT of a line is 15mm below the HP. the line inclined at 30 degree to the VP. draw the projections of AB and find its true length, inclination with the HP. also locate its HT

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• a line AB is 80mm long is inclined at 45 degree to hp and 30 degree to vp . its midpoint c is in vp and 15mm above the hp the end A is in third condrent and B is in the first quadrant. draw the projection of line.

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• a line AB is 80mm long is inclined at 45 degree to hp and 30 degree to vp . its midpoint c is in vp and 15mm above the hp the end A is in third condrent and B is in the first quadrant. draw the projection of line.

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### Projection of lines(new)

1. 1. Projection of straight line Line inclined to both HP & VPType-IGiven projections (FV & TV) of the line. To find True length & trueinclination of the line with HP (θ) and with VP(Φ). PROBLEM End A of a line AB is 15mm above HP & 20mm in front of VP while its end B is 50mm above HP and 75mm in front of VP. The distance between end projectors of the line is 50mm. Draw projections of the line and find its true length and true inclination with the principal planes. Also mark its traces.
2. 2. b’ b1 ’ θ: True inclination of the line with HP = 24º TL 50 a’ b2’ α : Inclination of FV of θ α the line with HP/XY HT VT’ 15X Y v h’ 50 Ø: True inclination of 20 Φ β b1 the line with VP = 41º a β : Inclination of TV of 75 the line with VP/XY TL b b2
3. 3. Line inclined to both HP & VPType –IIGiven (i) T.L., θ and Ø, (ii) T.L., F.V., T.V.to draw projections, find α, β,H.T. and V.T. PROBLEM A line AB, 70mm long, has its end A 15mm above HP and 20mm in front of VP. It is inclined at 30° to HP and 45°to VP. Draw its projections and mark its traces.
4. 4. b’ b1’ 70 a’ 30° HT b2’15 VT’ YX h’ v20 b1 a 45° 70 b2 b
5. 5. Q10.11 The top view of a 75mm long line AB measures 65mm,while its front view measures 50mm. Its one end A is in HP and12mm in front of VP. Draw the projections of AB and determine its inclination with HP and VP To draw FV &TV of the lineGiven, Hint: Draw ab1=65mm // to XY. ABTL=75mm,TV=65mm,FV=50mm Because when TV is // to XY, FV To find θ & Ø gives TL.A is in HP & 12mm VP → b’ b1 ’ Ans. θ=31º 50 75 Ans. Ø=49º a’X Y 31º 12 65 b1 a 49º 75 65 b b2
6. 6. Q10.12 A line AB, 65mm long has its end A 20mm above H.P. and 25mm in front of VP. The end B is 40mm above H.P. and 65mm in front of V.P. Draw the projections of AB and show its inclination with H.P. and V.P. Given, To draw FV &TV of the line Hint1:Mark a’ 20mm above AB H.P & a 25mm below XY TL=65mm To find θ & Ø A is 20mm ↑ HP & 25mm →V.P. b’ b1 ’ Hint2:Draw locus of b’ 40mm B is 40mm ↑ & 65mm → V.P. above XY & locus of b 65 mm below XY a’ 65 b2 ’ 40 18º 20X Y 25 38º Ans. θ=18º b1 a Ans. Ø=38º 65 65 b b2
7. 7. Q10.13:The projectors of the ends of a line AB are 5cm apart. The end A is2cm above the H.P and 3cm in front of V.P. The end B is1cm below H.P. and4cm behind the V.P. Determine the true length and traces of AB, and itsinclination with the two planes Given, To find, A0B0=50mm True Length, θ,Ø, H.T. and V.T. A is 20mm ↑ HP & 30mm →V.P. B is 10mm ↓ & 40mm ← V.P. b b2 a’ 40 HT b2 ’ 20 VT’ 91X v h’ Y 50 10 b’ 20º 30 Ans. θ=20º a 50º b1 Ans. Ø=50º
8. 8. Q10.14:A line AB, 90mm long, is inclined at 45 to the H.P. and its top view makes an angle of 60 with the V.P. The end A is in the H.P. and 12mm in front of V.P. Draw its front view and find its true inclination with the V.P. b’ Given, b1 ’ T.L.=90mm, θ=45º, β=60º A is in the H.P. & 12mm→V.P. To find/draw, F.V.,T.V. & Ø 90Ans. Ø = 38º a’ X Y 45º b1 12 60º 38º a 90 b b2
9. 9. Q10.16:The end A of a line AB is 25 mm behind the V.P. and is belowthe H.P. The end B is 12 mm in front of the VP and is above the HP Thedistance between the projectors is 65mm. The line is inclined at 40 tothe HP and its HT is 20 mm behind the VP. Draw the projections of theline and determine its true length and the VTGiven, To find/draw,A0B0=65mm F.V., T.V., T.L., VT’ A is 25mm ←V.P.& is ↓H.P. B is 12mm →V.P. & is above HP b’ b1 ’ θ = 40º b2’ VT’ a b1 HT b2 25 20X h’ v Y 12 40º a’ b 65
10. 10. 10.17:A line AB, 90mm long, is inclined at 30 to the HP. Its end A is 12mm above the HP and20mm in front of the VP. Its FV measures 65mm. Draw the TV of AB and determine itsinclination with the VP b’ b1 ’ 90 a’ 65 30° 12 X Y 20 44° b1 a Ans: Ø = 44º 90 b b2
11. 11. Q10.23:Two lines AB & AC make an angle of 120 between them in their FV & TV. AB isparallel to both the HP & VP. Determine the real angle between AB & AC. C c2 ’ c1 ’ c’ 112° Ans. 112º b’ 120° a’ X Y b a c2 c1 120° c
12. 12. Q8:A line AB 65 mm long has its end A in the H.P. & 15 mm infront of the V.P.The end B is inthe third quadrant. The line is inclined at 30 to the H.P. and at 60 to the V.P. Draw itsprojections.
13. 13. Q10.19 A line AB, inclined at 40º to the V.P. has its end 50mm and 20mm above theH.P. the length of its front view is 65mm and its V.T. is 10mm above the H.P.determine .the true length of AB its inclination with the H.P. and its H.T. Given, To find, Ø = 40º, A is 20mm↑HP, TL, θ & HT B is 50 mm ↑ HP, FV=65mm, VT is 10mm ↑ HP b1 ’ b’ 85 a’ 50 b2 ’ 21º HT VT’ 20 10X Y 40º v h’ b1 Ans, a TL = 85 mm, θ = 21º & HT is 17 mm behind VP b2
14. 14. Q6. The top view of a 75mm long line CD measures 50 mm. C is 50 mm in front of the VP &15mm below the HP. D is 15 mm in front of the VP & is above the HP. Draw the FV of CD &find its inclinations with the HP and the VP. Show also its traces. Given, To draw, TL = 75 mm, FV =50 mm, FV & to find θ & Ø C is 15mm ↓ HP & 50 mm → VP, D is 15 mm → VP d1 ’ d’ Hint 1: Cut anarc of 50 mm from c on locus of D Hint 2: Make TV (cd), // to XY so that FV will give TL 75X Y 15 d2 d Ans: Ø=48º c’ Ø=48º Locus of D 50 Ans: θ=28º 50 θ=28º d1 c
15. 15. Q10.10 A line PQ 100 mm long is inclined at 30º to the H.P. and at 45º to the V.P. Itsmid point is in the V.P. and 20 mm above the H.P. Draw its projections, if its end P is inthe third quadrant and Q is in the first quadrant. Given, To draw, TL = 100, θ = 30º, Mid point M is 20mm↑HP & in the VP FV & TV End P in third quadrant & End Q in first quadrant q’ q1 ’ p2 p p2 ’ 50 m’ 50 q2 ’ 30º 20 p1 50 X Y m q2 p1 ’ p’ 50 q q2