Electronic Engineering MCQ Question Papers: ENTC, IT Interview Placement

Subject: Electromagnetic and Transmission Lines 4

**Part 4: List for questions and answers of Electro Magnetics & Transmission Line**

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**Q1. Which co-ordinate/s serve/s to be a function of magnitude of magnetic field intensity ****due to infinite long straight filament?**

**a) 0**

**b) F**

**c) z**

**d) R**

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**Q2. What is the value of cross product for two similar unit vectors?**

**a) Zero**

**b) Infinity**

**c) Third unit vector**

**d) Negative vector**

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**Q3. Consider the equation of spherical capacitor given below. What does the potential ****between the spheres specify?**

**Equation: V = -(V0 / r) [ab / a-b] + V0[a / a-b]**

**a) As an integral of capacitance**

**b) As a derivative of radius**

**c) As an index of radial direction**

**d) As a function of position**

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**Q4. If the volume charge density is found to be zero, then what would be the transformed ****type of Poisson’s equation especially due to presence of line, point or surface charge?**

**a) **▾^{2} V = – (ρ_{v} / ε)

**b) **▾^{2} V = – ρ_{v}

**c) **▾^{2} V = 1

**d) **▾^{2} V = 0

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**Q5. Poisson’s equation is derived from ________**

**a) Laplace equation**

**b) Guass law**

**c) Thevenin’s theorem**

**d) Kirchoff’s law **

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**Q6. If the material is isotropic and linear, what would be the direction of electric field ****intensity and the polarization at each point?**

**a) Parallel**

**b) Perpendicular**

**c) Both a and b**

**d) None of the above**

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**Q7. Which consequence/s is/are likely to occur due to polarization?**

**a) Increase in electric flux density**

**b) Decrease in electric flux density**

**c) Stability in electric flux density**

**d) None of the above**

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**Q8. What is the value of rate of change of charge density for steady state current?**

**a) 0**

**b) 0.5**

**c) 1**

**d) 8**

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**Q9. Which parameter is considered as a reference for the measurement of zero potential?**

**a) Field**

**b) Ground**

**c) VCC**

**d) None of the above**

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**Q10. Electric field intensity is defined as the ratio of _____ to the test charge**

**a) Displacement**

**b) Pressure**

**c) Force**

**d) Current**

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**Q11. Along the parabola x = 2y^2, what will be the value of work done in carrying the charge ****of -4µJ, from point P1 (3,1,-1) to P2 (4,2,-1) in the electric field E = y ax + x ay ?**

**a) 4 µJ**

**b) 14 µJ**

**c) 28 µJ**

**d) 56 µJ **

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**Q12. Under which condition/s of the selected path, is the work done said to be zero?**

**a) Open loop**

**b) Closed loop**

**c) Both a and b**

**d) None of the above**

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**Q13. According to Maxwell’s first equation, the electric flux departing per unit volume is ****equal to _______**

**a) Line charge density**

**b) Surface charge density**

**c) Volume charge density**

**d) None of the above**

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**Q14. The field is said to have zero divergence, if the number of field lines arriving are ****______ to/than the number of field lines departing the volume**

**a) Less**

**b) Greater**

**c) Equal**

**d) None of the above**

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**Q15. What is the purpose of Gauss’s law?**

**a) To determine the enclosed charge**

**b) To estimate the flux passing through the closed surface**

**c) Both a and b**

**d) None of the above**

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**Q16. In the vector notation of force F21, what does the second number at suffix indicate?**

**a) Force exerted by the point charge**

**b) Force exerted on a point charge**

**c) Both a and b**

**d) None of the above**

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**Q17. Which among the following statements related to point charge is/are true?**

**a) Geometrical dimensions of point charges are negligible**

**b) Point charge is basically an electric charge located at any surface or space**

**c) Variation in the number of electrons in an atom constitutes the charge**

**d) All of the above **

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**Q18. On which factors does the magnitude of force depend, according to Coulomb’s law?**

**a) Size and shape of charges**

**b) Sign (polarity) of charges**

**c) Medium in which charges are placed**

**d) Displacement shown by the charges**

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**Q19. What does the line showing termination at R0 with an absence of standing wave and ****node/anti-node, known as?**

**a) Smooth line**

**b) Rough line**

**c) Load line**

**d) Point line**

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**Q20. What is the magnitude of current or voltage at the nodes of a line?**

**a) Zero**

**b) Unity**

**c) Infinite**

**d) None of the above **

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**Part 4: List for questions and answers of Electrom**
**agnetic**
** & Transmission Line**

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**Q1. Answer: c**

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**Q2. Answer: a**

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**Q3. Answer: d**

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**Q4. Answer: d**

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**Q5. Answer: b**

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**Q6. Answer: a**

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**Q7. Answer: a**

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**Q8. Answer: a**

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**Q9. Answer: b**

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**Q10. Answer: d**

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**Q11. Answer: d**

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**Q12. Answer: b**

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**Q13. Answer: c**

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**Q14. Answer: c**

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**Q15. Answer: b**

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**Q16. Answer: a**

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**Q17. Answer: d**

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**Q18. Answer: c**

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**Q19. Answer: a**

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**Q20. Answer: a**