Electromagnetics Set 21

Electrical Engineering

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This set of Electromagnetics Multiple Choice Questions & Answers (MCQs) focuses on Electromagnetics Set 21

Q1 | The current reflection coefficient of a line with voltage reflection coefficient of0.65 is given by
  • 0
  • 0.65
  • -0.65
  • 0.35
Answer: -0.65
Q2 | The power of the electromagnetic wave with electric and magnetic fieldintensities given by 12 and 15 respectively is
  • 180
  • 90
  • 45
  • 120
Answer: 90
Q3 | The transmission coefficient is given by 0.65. Find the return loss of thewave.
  • 9.11
  • 1.99
  • 1.19
  • 9.91
Answer: 9.11
Q4 | The intrinsic impedance of a wave with electric and magnetic field of 10 and8 respectively is
  • 1.6
  • 1.11
  • 1.25
  • 0.8
Answer: 1.11
Q5 | The intrinsic impedance in free space is
  • 60π
  • 12π
  • 6π
  • 120π
Answer: 120π
Q6 | The skin effect is a phenomenon observed in
  • insulators
  • dielectrics
  • conductors
  • semiconductors
Answer: conductors
Q7 | The skin depth is measured in
  • meter
  • millimetre
  • centimetre
  • micrometer
Answer: micrometer
Q8 | The attenuation constant is 0.5 units. The skin depth will be
  • 0.5
  • 0.25
  • 2
  • 4
Answer: 2
Q9 | The relation between the skin depth and frequency is given by
  • skin depth α f
  • skin depth α 1/f
  • skin depth α √f
  • skin depth α 1/√f
Answer: skin depth α 1/√f
Q10 | The skin depth of the wave having a frequency of 3MHz and a velocity of 12m/s is
  • 2
  • 3
  • 4
  • 6
Answer: 4
Q11 | The coaxial cable consists of
  • conductors
  • dielectric
  • conductor with dielectric
  • two conductors with dielectric
Answer: two conductors with dielectric
Q12 | The transmission line is said to be lossless when the
  • conductor is perfect and dielectric is lossless
  • conductor is perfect and dielectric is lossy
  • conductor is imperfect and dielectric is lossy
  • conductor is imperfect and dielectric is lossless
Answer: conductor is perfect and dielectric is lossless
Q13 | The resistance of a lossless transmission line is
  • 0
  • 1
  • -1
  • infinity
Answer: 0
Q14 | The attenuation constant is measured in the units of
  • ohm
  • neper
  • decibel
  • radian/sec
Answer: neper
Q15 | The condition that holds good in a distortionless transmission line is
  • r/l = g/c
  • rl = gc
  • l/r = c/g
  • rg/lc
Answer: r/l = g/c
Q16 | Given that R = 20 ohm, L = 40 mH, C = 40 μF, G = 0.02 mho. Find whetherthe line is distortionless or not.
  • distorted line
  • distortionless line
  • all of the mentioned
  • none of the mentioned
Answer: distortionless line
Q17 | For R= 20 ohm and G= 0.8 mho, the attenuation constant will be
  • 16
  • 4
  • 2
  • 32
Answer: 16
Q18 | The Smith chart is a polar chart which plots
  • r vs z
  • r vs znorm
  • t vs z
  • t vs znorm
Answer: r vs znorm
Q19 | The Smith chart consists of the
  • constant r and variable x circles
  • variable r and constant x circles
  • constant r and constant x circles
  • variable r and variable x circles
Answer: constant r and constant x circles
Q20 | The circles in the Smith chart pass through which point?
  • (0,1)
  • (0,-1)
  • (-1,0)
  • (1,0)
Answer: (1,0)
Q21 | Moving towards the clockwise direction in the Smith chart implies moving
  • towards generator
  • towards load
  • towards stub
  • towards waveguide
Answer: towards generator
Q22 | The centre of the point having a normalised resistance of 1.2 ohm andreactance of 1.5 ohm is
  • (0.54,0)
  • (0.45,0)
  • (0.36,0)
  • (0.78,0)
Answer: (0.54,0)
Q23 | The normalised load impedance of the transmission line 50 ohm with a loadof 30 ohm is
  • 30
  • 150
  • 5/3
  • 3/5
Answer: 3/5
Q24 | The radius of the point having a normalised resistance of 1 ohm is
  • 1
  • 0.2
  • 0.5
  • 0.25
Answer: 0.5
Q25 | The open circuit line will have a reflection coefficient of
  • 0
  • 1
  • -1
  • ∞
Answer: 1
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