answer key for anna university- chennai, jan 2013-fn

8/14/2019 Answer Key for Anna University- Chennai, Jan 2013-Fn

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ANSWER KEY FOR ANNA UNIVERSITY- CHENNAI, JAN 2013-FN

SUBJECT : ENGINEERING GRAPHICS

SEMESTER/YEAR : FIRST/FIRST DEPARTMENT : COMMON TO A

1!"!D#"$ %&' ()*+%' +. %&' (#' +. ("'%'# 0!

P#+'#':

a.with O as centre, radius equals to 20mm draw a circle.

b.let point A be the generating point/starting point

c.Divide the circle into 12 equale parts and give notations

d.if a thread to be partl unwound from the point A upto 11, the point A will move to the position

11such that 1! 11is equal to the arc length 1!A and also the line 1! 1 1 is tangent to the circle.


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e. to get the point 11through point 1! draw a line tangent to the circle. "ar# the point 11such that

1! 11$arc length 1!A

f. similarl get the points 21,%1,&1'''..

g. (oin the points 11,21,%1' b free hand. )he curve obtained is an involute.

1!!4(5!D(..'#')%("%' .(#6% ")7' 8#+9'%(+) $(%& %&(# ")7' 8#+9'%(+)

F(#6% ")7' 8#+9'%(+) T&(# ")7' 8#+9'%(+)

Ob(ect lies between observer and the plane of

pro(ection

*lane of pro(ection lies between the ob(ect and

the observer

+ront view comes above the top view +ront view comes below the top view

)he left side view will come to the right of the

front view

)he left side view will come to the left of the

front view.

1!!4((5!D#"$ %&' +#%&+7"8&( *('$6 .+# %&' 7(*') (6+'%#( *('$6 6()7 .#'' &")!

S%'86 .+# #$()7 %&' +#%&+7#"8&( *('$:

a. +ind the overall length,width and height of solid.

b. using these values draw the boundaries/rectangle for front ,top and side views as per the

first angle of pro(ection .

c. draw the visible and invisible lines of the ob(ects in all three views.


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d. Draw the centre lines for the circle.

e. dar#en all the visible lines b thic# continuous line and hidden lines b thic# dashed line

tpe.

2! "!4(5! D#"$ %&' 8#+9'%(+)6 +. .++$()7 8+()%6 +) " ++) #'.'#')' ()'

a. p,% behind the -* and 20 mm below the *

b. q ,&0 mm infornt of -* and %0 mm above the *

c. r,0 mm behind the -* and 1 mm above the *

d. s, &0 mm below * and in the -*

e. t, %0 mm infront of -* and 0 mm below the *

S%'86 .+# #"$()7 8#+9'%(+) 8+()% P

a. draw line

b. draw a pro(ector somewhere in the middle of the line

c. mar# point p!on it 20mm below , which is the front view of the point p.

d. on the same pro(ector mar# * %mm above line which is the top view

S%'86 .+# #"$()7 8#+9'%(+) 8+()%

a. draw the reference line


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b. draw a pro(ector line perpendicular to 3somewhere at middle of the line.

c. "ar# point q! on it %0mmabove , which is the front view of the point q.

d. On the same pro(ector mar# q &0mm below line, which is the top view of the point q.

S%'86 .+# #"$()7 8#+9'%(+) 8+()% R



c. mar# point r! on it 1mm above , which is the front view of the point r

d. on the same pro(ector mar# r 0mm above line, which is the top view of the point r.

S%'86 .+# #"$()7 8#+9'%(+) 8+()% S



c. mar# point s! on it &0mm below , which is the front view of the point s.

d. on the same pro(ector mar# s on line, which is the top view of the point s.

S%'86 .+# #"$()7 8#+9'%(+) 8+()% T



c. mar# point t! on it 0mm below , which is the front view of the point t.

d. on the same pro(ector mar# t %0mm below , which is the top view of the point t.

2!"!4((5! T&' ') P +. " ()' P, ;0 +)7 (6 1


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P#+'#':

"! draw the line

! Draw the point *! 1mm above and on the same pro(ector * 20mm below of

! Draw 40mm long line parallel to mar# point q!

! *ro(ect q! till it meets the point q, which is pro(ected from p drawn at &5 to -*.

'! "easure the true inclination.

2!! A (#"# 8"%' +. ("'%'# ;0 &"6 %&' ') P +. ("'%'# P () HP ") %&' 8"%' (6

()()' "% 0= %+ HP! #"$ (%6 8#+9'%(+)6

4(5 %&' ("'%'# P "88'"#6 %+ ' ()()' "% '6


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1. Draw the top view first a circle of radius % mm.divide the circle into 12 equal

points.draw pro(ectors from these points to meet at 1!'4!gives the front view

2. )ile the front view #eeping the point 1!touching the inclined at &0 deg to

%. Draw pro(ectors form tilted front view and hori6ontal lines from the top view to meet at

point1,2'.12

&. Draw a smooth curve along these points to get the new top view.

. )ilt this top view so that line 1,4 ma#es an angle of & deg to

7. Draw pro(ectors from tilted top view 1,2 and lines parallel to from the front view 1!'

4! to meet at point 1,2,,,,12!

4. Draw a smooth curve in free hand along these points to get the final front view.

3!"!D#"$ %&' 8#+9'%(+) +. &'?"7+)" 8#(6 +. "6' 6(' 20 ") "?(6 ')7%&


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1. 8imple top view is drawn first with the ais of the prism perpendicular to the ground andone of the edges of the base perpendicular to the vp.+ront view is pro(ected from it.

2. )hen the front view is tilted so that the ais is inclined at % deg to . )he second top

view is pro(ected from the tilted front view

%. )he upper end p1 q1r1s1t1u1 is visible and is drawn b using full lines. )he longer edges

are drawn net and other end is finished at the end. )he prism rests on the ground on the

edge 71 of the base. )he longer edgesp1 and u171 are hidden but parts of them coincide

with visible edges. )he edges 2111,1171 and711of the lower end are hidden.

3!! A 6@"#' 8#"( +. "6' 6(' 30 ") &'(7&%


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P#+'#':

a. draw the top view of the solid in simple position

b. draw the front view in simple position

c. redraw the front view so that the line s1! and p1! representing a base edge is ma#ing &5

with .

d. Draw vertical pro(ections from the front viewpoints p1!,s1!,o1! to meet the hori6ontalpro(ections from top view

e. 9oin q1,r1,o1,s1and p1 with continuous lines as the are visible as the etreme boundar

lines. all the edges of the base s1p13, p1q13, q1r13 are visible as that base is nearer to the

observer. )he base edge r1s1 is invisible as onl the top portion of the remaining portion

is invisible.

!"! A ()'# +. ("'%'# 0 ") &'(7&% 0 &"6 " ')%#" &'?"7+)" 6+% +. 6('

20 #))()7 #(7&% %+7& %&' ')7%&! T&' ()'# (6 ()7 +) %&' HP $(%& (%6 "?(6

8'#8')("# %+ VP! A *'#%(" %%()7 8")' %6 %&' ()'# () 6& " $" %&"% (% ''%6

%&' "6' "% .#+ ("'%#(" +88+6(%'6 ')! D#"$ %&' 6'%(+)" .#+)% *('$ ") %&'

%#' 6&"8' +. %&' 6'%(+)!


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P#+'#':

a. Draw the top and front view and show the cutting plane b its ).

b. )he cutting plane cuts the bases at four points 1,2,%,&. All the inner edges at the corners

of the heagonal slot are also cut and the cutting points are numbered as ,7,4,:,; and 10.

c. *ro(ect points 1,2,%,& to the front view on the circle as 1!,2!,'..etc. pro(ect points to 10

as !,7! coinciding with the corners of the heagon. atch the sectioned surface in the

front view.

d. *ro(ect the true shape on 11 drawn parallel to the ) and obtain the same 11!,21!,%1!,&1!

with an etended heagonal slot1!,71!,41!,:1!,;1!,101!.

e. +inish the drawing.

!!A 8')%"7+)" 8#"(, 6(' +. "6' 30 ") &'(7&%


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P#+'#':

a. draw the top view #eeping one of the base parallel to line and nearer to it.

b. )hen pro(ect its corresponding front view

c.


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g. 8ince the slant edge o!b! is perpendicular to . )he point 2! cant pro(ected directl. )o

get the point 2 pro(ect 2! on o!c! as 21! and then pro(ect it to the plan and mar# 21on oc.

h. 9oin these points 1,2,%,& and b straight lines in proper sequence to get the required

sectional top view

i. Draw a line 11parallel -) at an convenient distance.

6@"#' &+' (6 8"#"' %+ " ."' +. %&' &'?"7+)" 8#(6! D#"$ %&' (6+'%#( 8#+9'%(+) +.%&' 8#(6 $(%& &+' %+ . 6"'!

P#+'#':

a. draw the plan of the ob(ect and enclose the heagon in a bo.

b. =onstruct the isometric view of the bo with the two %05 ma#ing isometric ais.

c. "ar# the centre of the base plane and with respect to it draw the square.

d. 8imilarl draw the isometric square for the top face.


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e. 8ince the top face of the square is visible dar#en the same b free hand in continuous line

tpe. Draw the base of the square b dashed line tpe.

!S

answer key for anna university- chennai, jan 2013-fn

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