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Pranav Kulshrestha
Vadodara(India)
Vadodara Institute Of Engineering(GTU)
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Projection of straight line
Line inclined to both HP & VP
Type-I
Given projections (FV & TV) of the line. To find True length & true
inclination of the line with HP (θ) and with VP(Φ).
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.
PROBLEM
a’
X Y
a
15
20
50
50
b’
75
b1
b1’
b2’
b2
θ α
Φ β
h’
HT
v
VT’
b
θ: True inclination of
the line with HP = 24º
α : Inclination of FV of
the line with HP/XY
Ø: True inclination of
the line with VP = 41º
β : Inclination of TV of
the line with VP/XY
Type –II
Given (i) T.L., θ and Ø,
(ii) T.L., F.V., T.V.
to draw projections, find α, β,H.T. and V.T.
Line inclined to both HP & VP
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.
X
Y
15
a’
20
b1’
a
b2
30
45
b1
b
b’
b2’
h’
HT
v
VT’
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
X Y
a’
12
a
b1
Hint: Draw ab1=65mm // to XY.
Because when TV is // to XY, FV
gives TL.
b1’b’
65
b b2
Given,
TL=75mm,TV=65mm,FV=50mm
A is in HP & 12mm→VP
To draw FV &TV of the line
AB
To find θ & Ø
31º
49º
Ans. θ=31º
Ans. Ø=49º
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.
X Y
20
a’
25
a 4065
Given,
TL=65mm
A is 20mm ↑ HP & 25mm →V.P.
B is 40mm ↑ & 65mm → V.P.
To draw FV &TV of the line
AB
To find θ & Ø
Hint1:Mark a’ 20mm above
H.P & a 25mm below XY
Hint2:Draw locus of b’ 40mm
above XY & locus of b 65 mm
below XY
b1’
b1
b
b’
b2’
b2
18º
38º Ans. θ=18º
Ans. Ø=38º
Q10.13:The projectors of the ends of a line AB are 5cm apart. The end A is
2cm above the H.P and 3cm in front of V.P. The end B is1cm below H.P. and
4cm behind the V.P. Determine the true length and traces of AB, and its
inclination with the two planes
X Y50
20
a’
30
a
40
b
10
b’
b1
Ans. θ=20º
20º
b2’
b2
50º
Ans. Ø=50º
h’
HT
v
VT’
Given,
A0B0=50mm
A is 20mm ↑ HP & 30mm →V.P.
B is 10mm ↓ & 40mm ← V.P.
To
find, True
Length, θ,Ø, H.T. and V.T.
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.
YX
a’
a
12
45º
b1’
b1
60º
b
b’
Given,
T.L.=90mm, θ=45º, β=60º A
is in the H.P. & 12mm→V.P.
To find/draw,
F.V.,T.V. & Ø
b2
38º
Ans. Ø = 38º
Q10.16:The end A of a line AB is 25 mm behind the V.P. and is below
the H.P. The end B is 12 mm in front of the VP and is above the HP The
distance between the projectors is 65mm. The line is inclined at 40 to
the HP and its HT is 20 mm behind the VP. Draw the projections of the
line and determine its true length and the VT
X Y
Given,
A0B0=65mm
A is 25mm ←V.P.& is ↓H.P. B
is 12mm →V.P. & is above HP θ
= 40º
To find/draw,
F.V., T.V., T.L., VT’
25
a
65 12
b
20
HT
h’
b1
40º
b1’b’
a’
v
VT’
b2
b2’
10.17:A line AB, 90mm long, is inclined at 30 to the HP. Its end A is 12mm above the HP and
20mm in front of the VP. Its FV measures 65mm. Draw the TV of AB and determine its
inclination with the VP
X Y
12
a’
20
a
30
b1’b’
b1
b b2
44
Ans: Ø = 44º
Q10.23:Two lines AB & AC make an angle of 120 between them in their FV & TV. AB is
parallel to both the HP & VP. Determine the real angle between AB & AC.
X Y
c’
b’
ab
a’120
c
120
c1
c1’
c2
c2’
112
C
Ans. 112º
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 in
the third quadrant. The line is inclined at 30 to the H.P. and at 60 to the V.P. Draw its
projections.
Q10.19 A line AB, inclined at 40º to the V.P. has its end 50mm and 20mm above the H.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,
Ø = 40º, A is 20mm↑HP, B
is 50 mm ↑ HP, FV=65mm, VT is
10mm ↑ HP
To find,
TL, θ & HT
X Y
50
b’
20
a’
10
VT’
h’
b2’
v40º
b2
a
b1
b1’
21º HT
Ans,
TL = 85
mm, θ = 21º
& HT is 17
mm behind VP
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.
X Y
15
50
Given,
TL = 75 mm, FV =50
mm, C is 15mm ↓ HP & 50
mm → VP, D is 15 mm → VP
To draw,
FV & to find θ & Ø
c’
c
Locus of D
Hint 1: Cut anarc of 50 mm
from c on locus of D
d
Hint 2: Make TV (cd), // to XY
so that FV will give TL
d1
d1’
d’
Ø=48º
Ans: Ø=48º
d2
θ=28º
Ans: θ=28º
Q10.10 A line PQ 100 mm long is inclined at 30º to the H.P. and at 45º to the V.P. Its
mid point is in the V.P. and 20 mm above the H.P. Draw its projections, if its end P is in
the third quadrant and Q is in the first quadrant.
Given,
TL = 100, θ = 30º, Mid point M is
20mm↑HP & in the VP
End P in third quadrant &
End Q in first quadrant
To draw,
FV & TV
X Y
20
m’
m
30º
q1’
p1’
q2
p2
q2’
q’
p’
q
p
q2
p1
p2’

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Engineering garphics projection of lines(new)

  • 1. Pranav Kulshrestha Vadodara(India) Vadodara Institute Of Engineering(GTU) www.twitter.com/pranavkuls www.instagram.com/pranavkuls www.linkedin.com/in/pranavkuls www.facebook.com/pranavkuls http://www.plus.google.com/+PranavKulshrestha21 Skype and Wechat ID : pranavkuls
  • 2. Projection of straight line Line inclined to both HP & VP Type-I Given projections (FV & TV) of the line. To find True length & true inclination of the line with HP (θ) and with VP(Φ). 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. PROBLEM
  • 3. a’ X Y a 15 20 50 50 b’ 75 b1 b1’ b2’ b2 θ α Φ β h’ HT v VT’ b θ: True inclination of the line with HP = 24º α : Inclination of FV of the line with HP/XY Ø: True inclination of the line with VP = 41º β : Inclination of TV of the line with VP/XY
  • 4. Type –II Given (i) T.L., θ and Ø, (ii) T.L., F.V., T.V. to draw projections, find α, β,H.T. and V.T. Line inclined to both HP & VP 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.
  • 6. 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 X Y a’ 12 a b1 Hint: Draw ab1=65mm // to XY. Because when TV is // to XY, FV gives TL. b1’b’ 65 b b2 Given, TL=75mm,TV=65mm,FV=50mm A is in HP & 12mm→VP To draw FV &TV of the line AB To find θ & Ø 31º 49º Ans. θ=31º Ans. Ø=49º
  • 7. 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. X Y 20 a’ 25 a 4065 Given, TL=65mm A is 20mm ↑ HP & 25mm →V.P. B is 40mm ↑ & 65mm → V.P. To draw FV &TV of the line AB To find θ & Ø Hint1:Mark a’ 20mm above H.P & a 25mm below XY Hint2:Draw locus of b’ 40mm above XY & locus of b 65 mm below XY b1’ b1 b b’ b2’ b2 18º 38º Ans. θ=18º Ans. Ø=38º
  • 8. Q10.13:The projectors of the ends of a line AB are 5cm apart. The end A is 2cm above the H.P and 3cm in front of V.P. The end B is1cm below H.P. and 4cm behind the V.P. Determine the true length and traces of AB, and its inclination with the two planes X Y50 20 a’ 30 a 40 b 10 b’ b1 Ans. θ=20º 20º b2’ b2 50º Ans. Ø=50º h’ HT v VT’ Given, A0B0=50mm A is 20mm ↑ HP & 30mm →V.P. B is 10mm ↓ & 40mm ← V.P. To find, True Length, θ,Ø, H.T. and V.T.
  • 9. 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. YX a’ a 12 45º b1’ b1 60º b b’ Given, T.L.=90mm, θ=45º, β=60º A is in the H.P. & 12mm→V.P. To find/draw, F.V.,T.V. & Ø b2 38º Ans. Ø = 38º
  • 10. Q10.16:The end A of a line AB is 25 mm behind the V.P. and is below the H.P. The end B is 12 mm in front of the VP and is above the HP The distance between the projectors is 65mm. The line is inclined at 40 to the HP and its HT is 20 mm behind the VP. Draw the projections of the line and determine its true length and the VT X Y Given, A0B0=65mm A is 25mm ←V.P.& is ↓H.P. B is 12mm →V.P. & is above HP θ = 40º To find/draw, F.V., T.V., T.L., VT’ 25 a 65 12 b 20 HT h’ b1 40º b1’b’ a’ v VT’ b2 b2’
  • 11. 10.17:A line AB, 90mm long, is inclined at 30 to the HP. Its end A is 12mm above the HP and 20mm in front of the VP. Its FV measures 65mm. Draw the TV of AB and determine its inclination with the VP X Y 12 a’ 20 a 30 b1’b’ b1 b b2 44 Ans: Ø = 44º
  • 12. Q10.23:Two lines AB & AC make an angle of 120 between them in their FV & TV. AB is parallel to both the HP & VP. Determine the real angle between AB & AC. X Y c’ b’ ab a’120 c 120 c1 c1’ c2 c2’ 112 C Ans. 112º
  • 13. 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 in the third quadrant. The line is inclined at 30 to the H.P. and at 60 to the V.P. Draw its projections.
  • 14. Q10.19 A line AB, inclined at 40º to the V.P. has its end 50mm and 20mm above the H.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, Ø = 40º, A is 20mm↑HP, B is 50 mm ↑ HP, FV=65mm, VT is 10mm ↑ HP To find, TL, θ & HT X Y 50 b’ 20 a’ 10 VT’ h’ b2’ v40º b2 a b1 b1’ 21º HT Ans, TL = 85 mm, θ = 21º & HT is 17 mm behind VP
  • 15. 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. X Y 15 50 Given, TL = 75 mm, FV =50 mm, C is 15mm ↓ HP & 50 mm → VP, D is 15 mm → VP To draw, FV & to find θ & Ø c’ c Locus of D Hint 1: Cut anarc of 50 mm from c on locus of D d Hint 2: Make TV (cd), // to XY so that FV will give TL d1 d1’ d’ Ø=48º Ans: Ø=48º d2 θ=28º Ans: θ=28º
  • 16. Q10.10 A line PQ 100 mm long is inclined at 30º to the H.P. and at 45º to the V.P. Its mid point is in the V.P. and 20 mm above the H.P. Draw its projections, if its end P is in the third quadrant and Q is in the first quadrant. Given, TL = 100, θ = 30º, Mid point M is 20mm↑HP & in the VP End P in third quadrant & End Q in first quadrant To draw, FV & TV X Y 20 m’ m 30º q1’ p1’ q2 p2 q2’ q’ p’ q p q2 p1 p2’