Engineering Mathematics I - 2009 - 1st Semester - EduRev Class 12 Notes | EduRev

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Class 12 : Engineering Mathematics I - 2009 - 1st Semester - EduRev Class 12 Notes | EduRev

 Page 1


B.E. 1
st
 Semester 
Engineering Maths-I 
PART A 
Q1. (a) Discuss the continuity of the following 
(i) ???? ( ???? , ???? ) = ?
???? 2
- ???????? + ???? - ???? ???? - ???? , (???? , ???? ) ? (2,2)
1            ,     ( ???? , ???? ) = (2,2)
 
(ii) ???? ( ???? , ???? ) = ?
sin
-1
( ???? +2 ???? )
tan
-1
(2 ???? +4 ???? )
, (???? , ???? ) ? (0,0)
1
2
                   , ( ???? , ???? ) = (0,0)
 
(b) Find the linearization ???? (???? , ???? , ???? ) of the function ???? ( ???? , ???? , ???? ) = v2 ???????????????? sin ? (???? + ???? ) at ????°(0 ,0,
???? 4
). 
Find an upper bound for the magnitude of error in E in the approximation ???? (???? , ???? , ???? ) ˜ ???? (???? , ???? , ???? ) 
over the region ???? : | ???? | = 0.01, | ???? | = 0.01, | ???? - ???? /4| = 0.01. 
Q2. (a) If ???? (???? , ???? , ???? ) is differentiable and ???? = ???? - ???? , ???? = ???? - ???? , ???? = ???? - ???? , prove that 
 
???????? ???????? +
???????? ???????? +
???????? ???????? = 0. 
(b) Expand ???? ( ???? , ???? ) = tan
-1
???????? in powers of ???? - 1 ???????????? ???? - 1 upto second degree terms. 
Q3. (a) Find the minimum value of ???? 2
+ ???? 2
+ ???? 2
 subject to the condition ???????????? = ???? 3
. 
(b) Find the volume of the prism whose base is the triangle bound by the ???? - ???????????????? and the lines 
???? = ???? ???????????? ???? = 1 and whose top ;ies in the plane ???? = ???? ( ???? , ???? ) = 2 - ???? - ???? . 
Q4. (a) Evaluate ? ? ???? ???? - ???? 2
/ ???? ???????????????? ???? 0
8
0
 by change of order of integration. 
(b) Find the volume of the ellipsoid 
???? 2
???? 2
+
???? 2
???? 2
+
???? 2
???? 2
= 1 
PART-B 
Q5. (a) Define curvature of a smooth curve. Prove that the curvature of a smooth curve 
???? ¯( ???? ) = ???? ( ???? ) ???? ^ + ???? (???? )???? ^ defined by twice differentiable function ???? = ???? ( ???? ) ???????????? ???? = ???? ( ???? ) is given by 
the formula: 
???? =
| ???? ? ???? ¨ - ???? ? ???? ¨|
? ???? 2 ? + ???? 2 ? ?
3/2
 
Compiled by Akshit Chauhan (IT-3rd Sem) of 4.
Compiled by Akshit Chauhan (IT-3rd Sem) of 4.
Page 2


B.E. 1
st
 Semester 
Engineering Maths-I 
PART A 
Q1. (a) Discuss the continuity of the following 
(i) ???? ( ???? , ???? ) = ?
???? 2
- ???????? + ???? - ???? ???? - ???? , (???? , ???? ) ? (2,2)
1            ,     ( ???? , ???? ) = (2,2)
 
(ii) ???? ( ???? , ???? ) = ?
sin
-1
( ???? +2 ???? )
tan
-1
(2 ???? +4 ???? )
, (???? , ???? ) ? (0,0)
1
2
                   , ( ???? , ???? ) = (0,0)
 
(b) Find the linearization ???? (???? , ???? , ???? ) of the function ???? ( ???? , ???? , ???? ) = v2 ???????????????? sin ? (???? + ???? ) at ????°(0 ,0,
???? 4
). 
Find an upper bound for the magnitude of error in E in the approximation ???? (???? , ???? , ???? ) ˜ ???? (???? , ???? , ???? ) 
over the region ???? : | ???? | = 0.01, | ???? | = 0.01, | ???? - ???? /4| = 0.01. 
Q2. (a) If ???? (???? , ???? , ???? ) is differentiable and ???? = ???? - ???? , ???? = ???? - ???? , ???? = ???? - ???? , prove that 
 
???????? ???????? +
???????? ???????? +
???????? ???????? = 0. 
(b) Expand ???? ( ???? , ???? ) = tan
-1
???????? in powers of ???? - 1 ???????????? ???? - 1 upto second degree terms. 
Q3. (a) Find the minimum value of ???? 2
+ ???? 2
+ ???? 2
 subject to the condition ???????????? = ???? 3
. 
(b) Find the volume of the prism whose base is the triangle bound by the ???? - ???????????????? and the lines 
???? = ???? ???????????? ???? = 1 and whose top ;ies in the plane ???? = ???? ( ???? , ???? ) = 2 - ???? - ???? . 
Q4. (a) Evaluate ? ? ???? ???? - ???? 2
/ ???? ???????????????? ???? 0
8
0
 by change of order of integration. 
(b) Find the volume of the ellipsoid 
???? 2
???? 2
+
???? 2
???? 2
+
???? 2
???? 2
= 1 
PART-B 
Q5. (a) Define curvature of a smooth curve. Prove that the curvature of a smooth curve 
???? ¯( ???? ) = ???? ( ???? ) ???? ^ + ???? (???? )???? ^ defined by twice differentiable function ???? = ???? ( ???? ) ???????????? ???? = ???? ( ???? ) is given by 
the formula: 
???? =
| ???? ? ???? ¨ - ???? ? ???? ¨|
? ???? 2 ? + ???? 2 ? ?
3/2
 
Compiled by Akshit Chauhan (IT-3rd Sem) of 4.
Compiled by Akshit Chauhan (IT-3rd Sem) of 4.
(b) Without finding ???? ?
 ???????????? ???? ?
 write the acceleration of the motion  
???? ?( ???? ) = ( ???? ???? cos ???? ) ???? ^ + ( ???? ???? sin ???? ) ???? ^ + v2 ???? ???? ???? ?
 
???? = 0 ???????? ????h???? ???????????????? ???? ? = ???? ???? ???? ? ?
+ ???? ???? ???? ? ? ?
 
Q6. Find the directional derivative of ?
( ???? , ???? , ???? ) = ???? ???? 2
+ ???? ???? 3
 at the point (2,-1,1) in the direction 
of the vector ???? ^ + 2 ???? ^ + 2 ???? ?
. 
Q7. (a) Prove that the differential form in the integral below is exact. Then evaluate the integral. 
? 2 cos ???? (1,
???? 2
,2)
(0,2,1)
???????? + ?
1
???? - 2 ???????????????? ???? ? ???????? +
1
???? ???????? 
(b) State Green’s theorem. Apply it to evaluate the integral ?
( ???? 2
???????? + ???? 2
???????? ), ???? :
 
???? the triangle 
bounded by ???? = 0, ???? + ???? = 1, ???? = 0. 
Q8. (a) Evaluate ? ???? ?
. ???????? ? ? ? ? ?
 
???? by Stoke’s theorem, where ???? ?
= ???? 2
???? ^ + ???? 2
???? ^ - (???? + ???? )???? ?
 and ???? is the 
boundary of the triangle with vertices at (0,0,0), (1,0,0), and (1,1,0). 
(b) State Gauss divergence theorem. Use it to find the outward flux of ???? ?
 across the boundary of 
the region D: 
???? ?
= ( ???? - ???? ) ???? ^ + ( ???? - ???? ) ???? ^ + (???? - ???? )???? ?
 
D: the cube bounded by the planes ???? = ±1, ???? = ±1, ???? = ±1. 
30/Oct/2011 
Disclaimer: Well this looks a little stupid but we are not responsible if any portion of this paper is 
not relevant with today’s syllabus. Due care has been taken to make this paper error free, but 
there always remains a chance of error so please ignore any typographical error if present..  
© http://www.myuiet.com 
 
Compiled by Akshit Chauhan (IT-3rd Sem) of 4.
Compiled by Akshit Chauhan (IT-3rd Sem) of 4.
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