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RGPV Civil Engineering (Semester 4)
Engineering Mathematics 3
December 2015
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1(a) Write Caunchy-Riemann equations in polar form.
2 M
1(b) If $$f(x)=\dfrac{z^{2}}{(z-1)^2(z+1)}$$ then find Res f(I).
2 M
1(c) Find the value of $$\int\dfrac{z^{2+3z+1}}{z-1}dz$$  where C being $$|z|=\dfrac{1}{2}$$
3 M
Solve any one question from Q.1(d) & Q.1(e)
1(d) Apply calculus of Residue to prove that
$\int_{0}^{2\pi }\dfrac{cos2\theta }{1-2acos\theta +a^{2}}=\dfrac{2\pi a^{2}}{1-a^{2}},(a^{2}<1)$
7 M
1(e) Show that ex(x cosy-y siny) is a harmonic function. Find the analytic function for which ex(x cosy-y siny) is imaginary part.
7 M

2(a) Write a short note on errors.
2 M
2(b) Write the procedure of Gauss-elimination method for solving the system of simultaneous linear equations.
2 M
2(c) Find a real root of the equation f(x)=x3-4x-9=0, using bisection method in four stages
3 M
Solve any one question from Q.2(d) & Q.2(e)
2(d) Find a real root of the equation x4-x-13=0 by Newton Raphson method correct to three decimal places.
7 M
2(e) Solve the following system by Gauss-Seidel method:
10x+2y+z=9
2x+20y-2z=-44
2x+3y+10z=22
7 M

3(a) Find the value of $\left ( \dfrac{\Delta ^{2}}{E} \right )e^{x}$
2 M
3(b) Prepare the difference table for the following data:
 x : 10 20 30 40 50 y: 12 15 20 27 39
2 M
3(c) Evaluate $\int_{0}^{1}\dfrac{dx}{1+x} by \,using \,simpson's \,\dfrac {1^{rd}}{3}$ rule, take n=5
3 M
Solve any one question from Q.3(d) & Q.3(e)
3(d) Find a polynomial satisfied by (-4,1245),(-1,33),(0,5),(2,9) and (5,1335) by Newton's divided difference formula.
7 M
3(e) Calculate the first and second derivatives of the function tabulated below, at the point x=1.1.
 x: 1 1.2 1.4 1.6 1.8 2 f(x): 0 0.128 0.544 1.296 2.432 4
7 M

4(a) If $$\dfrac{dy}{dx}=f(x,y)$$ with initial condition y=y0 at x=x0, then write first two approximations using Picard's method.
2 M
4(b) Write the normal equations for equation of second degree parabola to be fitted to given set of data.
2 M
4(c) Use Euler's method to find y(0.2) from the differential equation $$\dfrac{dy}{dx}=xy$$, y(0)=1 take h=0.1
3 M
Solve any one question from Q.4(d) & Q.4(e)
4(d) Use Runge-kutta method to solve the equaation $\dfrac{dy}{dx}=1+y^{2}$ for x=.02 to x=0.4 with h=0.2, given that y(0)=0.5.
7 M
4(e) Calculate the coefficient of correlation between the marks in Mathematics and Physics for 8 students:
 Mathematics: 76 90 98 69 54 82 67 52 Physics: 25 37 56 12 17 36 27 11
7 M

5(a) Write the mean and variance of the Binomial distribution.
2 M
5(b) Define types of sampling.
2 M
5(c) A manufacturer who produces medicine bottles, finds that .01% of the bottles are defective. The bottles are packed in boxes containing 500 bottles. A drug manufacturer buys 100 boxes from the producer of bottles. Using Poisson distribution, find how many boxes will contain no defectives.$(Given\,e^{-0.5}=0.6065)$
3 M
Solve any one question from Q.5(d) & Q.5(e)
5(d) A random sample of size 16 has 53 as mean. The sum of the squares of the deviations take form mean is 150. Can this sample be regarded as taken from the population having 56 as mean? Obtain 95% and 99% confidence limits of the mean of the population. $[For\,v=15,t_{0.01}=2.95\,\, and \,\,t_{0.05}=2.13]$
7 M
5(e) The probability that an evening college student will graduate is 0.4. Determine the probability that out of 5 students.
i) None ii) one and iii) at least on will graduate.
7 M

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