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Microwave Engineering MCQs Set-2

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1. If a transmission line is exited from a source of 4V at 1.2GHz frequency with a generator impedance of 4+j3 with a characteristic impedance of the transmission line 50Ω,then the power delivered to the load is:




2. If the generator impedance of a source connected to a transmission line is 50+j100Ω, then for conjugate matching to occur, the input impedance must be:




3. After conjugate impedance matching the input impedance used for matching after normalization was 1+j with the characteristic impedance of the transmission line being 100Ω, then the generator impedance must have been:




4. For a matched transmission line with a generator impedance of 50Ω and the source being 4V,1GHZ,then the maximum power delivered to the line is:




5. If the power delivered to a load is 0.04w, then the normalized generator impedance if the source use is 4V at 2GHz and the generator impedance is real and characteristic impedance of the transmission line is 50Ω is:




6. For a low loss line when both conductor and di-electric loss is small, the assumption that could be made is:




7. Expression for α(attenuation constant) in terms of R , G, L and C of a transmission line is:




8. Expression for characteristic impedance Zₒ of a transmission line in terms of L and C the transmission line is:




9. If the inductance and capacitance of a loss line transmission line are 45 mH/m and10 µF/m, the characteristic impedance of the transmission line is:




10. If the characteristic impedance of a transmission line is 50 Ω, and the inductance of the transmission line being 25 mH/m, the capacitance of the lossy transmission line is:




11. If R = 1.5Ω/m, G = 0.2 mseimens/m, L = 2.5 nH/m, C = 0.1 pF/m for a low loss transmission line, then the attenuation constant of the transmission line is:




12. A lossy line that has a linear phase factor as a function of frequency is called:




13. The condition for a distortion less line is:




14. For a distortion less line, R= 0.8Ω/m, G= 0.8 msiemens/m, L= 0.01µH/m then C is:




15. For a lossy transmission line, γ=0.02+j0.15 and is 20m long. The line is terminated with an impedance of a 400Ω. Then the input impedance of the transmission line given that the characteristic impedance of the transmission line is 156.13+j11.38Ω is:




16. Maxwell’s equation for electromagnetic waves in a waveguide is:




17. If the wavelength of a signal is 10 mm, then the wavenumber of the material when a waveguide is filled with that material is:




18. If a waveguide is filled with a lossless material of relative permeability 2, then the wave impedance in the TEM mode is:




19. If the wave impedance of a medium is 200 Ω, then what is the relative permittivity of that medium?




20. If p=0.3 and the wave number of air in TM mode is 16, then the intrinsic impedance of air in TM mode given wave number is 125 is:




21. If the intrinsic impedance of a medium is 0.8 Ω, with wave number 125 and β being 0.2, then the relative permeability of the medium is:




22. The losses that occur in a transmission line is:




23. Which of the following is true regarding attenuation?




24. If the wave number of a medium is 20 and loss tangent is 0.4 , then the dielectric loss caused by the medium is:




25. If the dielectric loss of a medium is 0.2 Np/m with a wave number of 12, then the value of loss tangent is:




26. The modes of wave propagation that a parallel plate waveguide can support are:




27. The fringe effect can be neglected in a parallel plate waveguide is because of:




28. The characteristic impedance of a parallel plate waveguide is given by:




29. If the width of a parallel plate waveguide is 30 mm and the distance between the parallel pates is 5 mm, with an intrinsic impedance of 377Ω, then the characteristic impedance of the wave is:




30. The wave impedance of a TM mode in a parallel plate waveguide is a:




31. In a parallel plate waveguide, for a propagating mode, the value of β is:




32. For TM2 mode, if the distance between two parallel plates of a waveguide are 40 mm, then the cut off wavelength for TM2 mode is:




33. For a parallel waveguide, the dominant mode for TM propagation is:




34. Phase velocity of the plane waves in the two direction in a parallel plate waveguide is:




35. For a parallel plate waveguide, which of the following is true?




36. The wave impedance for a non-propagating mode in TE mode is:




37. The modes of propagation supported by a rectangular wave guide is:




38. A hollow rectangular waveguide cannot propagate TEM waves because:




39. For any mode of propagation in a rectangular waveguide, propagation occurs:




40. Dominant mode is defined as:




41. For dominant mode propagation in TE mode, if the rectangular waveguide has a broader dimension of 31.14 mm , then the cutoff wave number:




42. The lowest mode of TM wave propagation is:




43. The cutoff frequency for the dominant mode in TM mode propagation for a rectangular waveguide of dimension of 30mm*40mm is:




44. In TE10 mode of wave propagation in a rectangular waveguide, if the broader dimension of the waveguide is 40 cm, then the cutoff wavelength for that mode is:




45. In TE01 mode of wave propagation in a rectangular waveguide, if the smaller dimension of the waveguide is 2 cm, then the cutoff wavelength for that mode is:




46. The lowest mode of TE mode propagation in a circular waveguide is:




47. For a circular waveguide in TM11 mode of propagation with inner radius of 30mm, and the phase constant being equal to 0.3, then the wave impedance is equal to:




48. In TM mode, what is the first propagating mode?




49. The cutoff frequencies of the first two propagating modes of a Teflon on a filled circular waveguide with a=0.5 with ∈r=2.08 is:




50. What are the modes of propagation that a co axial line supports?