This download link is referred from the post: PTU B.Tech Question Papers 2020 December (All Branches)
Roll No. β β β β β β β β β β β β β Total No. of Pages : 02
Total No. of Questions : 18
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B.Tech (Automation & Robotics) (2011 & Onwards) (Sem.-5)NUMERICAL METHODS IN ENGINEERING
Subject Code : ME-309
M.Code : 70482
Time : 3 Hrs. Max. Marks : 60
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INSTRUCTIONS TO CANDIDATES :
- SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks each.
- SECTION-B contains FIVE questions carrying FIVE marks each and students have to attempt ANY FOUR questions.
- SECTION-C contains THREE questions carrying TEN marks each and students have to attempt ANY TWO questions.
SECTION-A
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Answer the following :
- Define a cubic spline interpolant with natural boundary.
- What do we mean by unconditionally stable method?
- Find the condition number of the function f(x) = cos x.
- Determine the Lagrange interpolating-polynomial passing through the points (2,4) and (5,3).
- Out of chopping of numbers and rounding off of numbers, which one introduce less error? Explain suitably.
- Find the l1 norm of the vector (1,β6,3)T.
- What is the order of convergence when Newton Raphson's method is applied to the equation x2 β 6x + 9 = 0 to find its multiple root.
- Use the forward-difference formula to approximate the derivative of f(x) = ln x at x0=1.8 using h =0.01.
- Compute β« x sin x dx using Simpsonβs rule.
- Explain Lagrange's interpolation.
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SECTION-B
- Use Eulerβs method to approximate the solution of the following initial value problem y' = y - t2, 1 < t < 2, y(1)=1, h=0.1.
- Construct a clamped spline S(x) which passes through the points (1,2), (2,3) and (3,5) that has S'(1)=2 and S'(3) = 1.
- The following data is given :
x 1.0 1.3 1.6 1.9 2.2 f(x) 0.7651977 0.6200860 0.4554022 0.2818186 0.1103623 - Let f(x) = (x cos x β sin x)/(x β sin x). Use four digit rounding arithmetic to evaluate f(0.1). The actual value is f(0.1) =-1.99899998, using this value find the relative error.
- Use backward-difference method with steps sizes h = 0.1 and k = 0.01 to approximate the solution to the heat equation βu/βt(x,t) = β2u/βx2(x,t) = 0, 0 < x < 1, t β₯ 0, with boundary conditions u(0,t)=u(1,t)=0, t>0, u(x,0) =sin(Οx), 0 < x < 1.
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SECTION-C
- Determine the values of h that will ensure an approximation error of less than 0.00002 when approximating β« sin x dx and employing:
- Composite trapezoidal rule:
- Composite Simpson's rule.
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- Draw the graph of 4x = tan x. Use Newton's method to find the first two positive roots of 4x = tan x (Note: You can use the graph drawn for selecting your initial guesses.).
- Use Gauss elimination method with scaled partial pivoting to solve the following linear system of equations 2.11x1 - 4.21x2 + 0.921x3 = 2.01,
4.01x1 + 1.02x2 - 1.12x3 = -3.09,
1.09x1 + 0.987x2 + 0.832x3 = 4.21.
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NOTE : Disclosure of identity by writing mobile number or making passing request on any page of Answer sheet will lead to UMC case against the Student.
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This download link is referred from the post: PTU B.Tech Question Papers 2020 December (All Branches)