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Previous Year Exam Questions of Building Materials and Building Construction of bput - BMBC by Verified Writer

  • Building Materials and Building Construction - BMBC
  • 2017
  • PYQ
  • Biju Patnaik University of Technology Rourkela Odisha - BPUT
  • Civil Engineering
  • B.Tech
  • 248 Views
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  • Uploaded 2 years ago
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Registration No: Total Number of Pages : 02 B.Tech PEE3G002 3rd Semester Regular Examination 2017-18 ELECTROMAGNETIC THEORY BRANCH : ELECTRICAL Time : 3 Hours Max Marks : 100 Q.CODE : B1225 Answer Question No.1 and 2 which are compulsory and any four from the rest. The figures in the right hand margin indicate marks. Q1 a) b) c) Answer the following questions: multiple type or dash fill up type The gradient of scalar field V  x 2 y  xyz is _______________. Which of the following is mathematically in correct 1. grad div 2. grad curl 3. div curl 4. curl grad At Cartesian point ( — 3, 4, — 1), which of these is incorrect? 3. r  26 1.   5   tan 1 d) e) f) g) h) i) j) Q2 a) b) c) d) e) f) g) h) i) j) 5 1 4.   tan 1 (2 x 10) 4 3 2. Which is not an example of convection current? 1. A moving charged belt 2. Electronic movement in a vacuum tube 3. An electron beam in a television tube 4. Electric current flowing in a copper wire If a solution lo Laplace's equation can be found that satisfies the boundary conditions, then the solution is unique, is called as _____________ theorem. A perfect conductor is one in which    . 1. True 2. False The electric field intensity E is __________ when placed in an electric field. In a good conductor, E & H are in time phase. 1. True 2. False The phenomenon whereby the field intensity in a conductor rapidly decreases is known as____________. What is the unit of magnetic charge 1. Ampere meter squared 2. Coulomb 3. Ampere 4. Ampere - meter Answer the following questions: Short answer type State the conditions for a vector to be solenoidal and irrotational. Draw the equipotential surfaces and flux lines for (a) point charge (b) electric dipole Find the Curl of the vector field P  x 2 yza x  xza z . State the Maxwell’s Equations in electrostatics. What do you mean by electric flux density? Find it for a point charge. List the characteristics of a uniform plane wave. What is skin depth? How it related with frequency? What is Brewester angle? Write the statement of the law that provide the magnetic field intensity of a current a element. What is poynting’s theorem? (2 x 10)

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Q3 a) b) Drive the Laplace equation from gauss’s law in electrostatics. Two point charges -4µC and 5µC are located at (-2, -1, 3) and (0, 4, -2) respectively. Find the potential at (1, 0, 1), assuming zero potential at infinity. (10) (5) Q4 a) A charge distribution in space has =2 / otherwise. Determine E at = 2 and = 12 . State and explain the Ampere’s circuital law. (10) b) Q5 Q6 and zero (5) If D  (2 y 2  z ) ax  4 xya y  xaz C / m 2 (10) b) Find. The volume charge density at (-1, 0, 3). Describe the Coulomb’s law and find the expression for electrical field intensity at point r due to a point charge located at r’. (5) a) a) b) Two extensive homogeneous isotropic dielectrics meet on plane z = 0. For z = 0,  r1  4 and for z < 0,  r 2  3 . A uniform electric field E1  5ax  2a y  3a z kV/m exists for z > 0. Find 1. E2 for z  0 , 2. The angle E1 and E2 make with interface. Derive the expression for D for a uniformly charged sphere using Gauss Law. What are boundary conditions and derive the boundary conditions for dielectric and dielectric interface. A circular ring of radius a carries a uniform charge C/m and is placed on the xy– plane with axis the same as the z-axis. Show that E(0,0, ℎ) Q8 ≤ 10 a) b) Q7 for 0≤ a) b) = [ (10) (5) (10) (5) ] What is Polarization of electromagnetic wave? Explain various types of polarization. A lossy dielectric has an intrinsic impedance of 200 ‫ے‬30° Ω at a particular frequency. If, at that frequency, the plane wave propagating through the dielectric has the magnetic field component. (10) (5) 1   H=10e  z cos  wt  x  A / m 2   Find E and α. Q9 a) b) Write shorts notes on following 1.MUF and skip Distance 2. Methods of Images Name various ionosphere layers present in atmosphere. How wave propagation takes place through these layers? (10) (5)

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