Electromagnetics Set 20

Electrical Engineering

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This set of Electromagnetics Multiple Choice Questions & Answers (MCQs) focuses on Electromagnetics Set 20

Q1 | Which transmission line is called as one to one transformer?
  • l = λ
  • l = λ/2
  • l = λ/4
  • l = λ/8
Answer: l = λ/2
Q2 | The characteristic impedance of a quarter wave transformer with load andinput impedances given by 30 and 75 respectively is
  • 47.43
  • 37.34
  • 73.23
  • 67.45
Answer: 47.43
Q3 | The input impedance of a quarter wave line 50 ohm and load impedance of20 ohm is
  • 50
  • 20
  • 1000
  • 125
Answer: 125
Q4 | The reflection coefficient lies in the range of
  • 0 < τ < 1
  • -1 < τ < 1
  • 1 < τ < ∞
  • 0 < τ < ∞
Answer: 0 < τ < 1
Q5 | When the ratio of load voltage to input voltage is 5, the ratio of thecharacteristic impedance to the input impedance is
  • 1/5
  • 5
  • 10
  • 25
Answer: 5
Q6 | The reflection coefficient of a wave with transmission coefficient 0.35 is
  • 1.35
  • 0.65
  • 0.35
  • 0.7
Answer: 0.65
Q7 | The incident wave amplitude is 24 units. Find the reflected wave amplitude ifthe reflection coefficient is 0.6.
  • 14.4
  • 16.6
  • 13.3
  • 11.1
Answer: 14.4
Q8 | Find the reflection coefficient of the wave passing through two media havingintrinsic impedances of 4 and 9 respectively.
  • 0.5
  • 1
  • 0.38
  • 0.1
Answer: 0.38
Q9 | The reflection coefficient of a wave travelling through two media havingpermittivities 4 and 9 respectively is
  • 0
  • 0.5
  • 0.25
  • 0.2
Answer: 0.2
Q10 | Calculate the transmission coefficient, when the incident and transmittedamplitudes are 10 and 7 respectively.
  • 17
  • 3
  • 10/7
  • 0.7
Answer: 0.7
Q11 | The transmission coefficient in a wave travelling through two media havingintrinsic impedances of 5.5 and 1.33 is
  • 0.389
  • 0.55
  • 0.133
  • 0.42
Answer: 0.389
Q12 | The transmission coefficient in a wave travelling through two media havingpermittivities 4 and 1 is
  • 1/4
  • 3/2
  • 3/4
  • 2/3
Answer: 2/3
Q13 | The reflection coefficient of a transmission line having characteristic and loadimpedances as 50 and 30 ohm respectively is
  • 1/4
  • 1/8
  • 1/2
  • 3/4
Answer: 1/4
Q14 | In matched line, the transmission coefficient is
  • 0
  • 1
  • -1
  • infinity
Answer: 1
Q15 | Standing waves occurs due to
  • impedance match
  • impedance mismatch
  • reflection
  • transmission
Answer: impedance mismatch
Q16 | Standing wave ratio is defined as the
  • ratio of voltage maxima to voltage minima
  • ratio of current maxima to current minima
  • product of voltage maxima and voltage minima
  • product of current maxima and current minima
Answer: ratio of voltage maxima to voltage minima
Q17 | Given that the reflection coefficient is 0.6. Find the SWR.
  • 2
  • 4
  • 6
  • 8
Answer: 4
Q18 | The maxima and minima voltage of the standing wave are 6 and 2respectively. The standing wave ratio is
  • 2
  • 3
  • 1/2
  • 4
Answer: 3
Q19 | Find the standing wave ratio, when a load impedance of 250 ohm isconnected to a 75 ohm line.
  • 0.3
  • 75
  • 250
  • 3.33
Answer: 3.33
Q20 | Find the reflection coefficient of the wave with SWR of 3.5.
  • 0.55
  • 0.23
  • 0.48
  • 0.68
Answer: 0.55
Q21 | The range of the standing wave ratio is
  • 0 < s < 1
  • -1 < s < 1
  • 1 < s < ∞
  • 0 < s < ∞
Answer: 1 < s < ∞
Q22 | For matched line, the standing wave ratio will be
  • 0
  • ∞
  • -1
  • 1
Answer: 1
Q23 | The maximum impedance of a 50 ohm transmission line with SWR of 3 is
  • 50/3
  • 3/50
  • 150
  • 450
Answer: 150
Q24 | The minimum impedance of a 75 ohm transmission line with a SWR of 2.5 is
  • 100
  • 50
  • 25
  • 30
Answer: 30
Q25 | The standing wave ratio of short circuited and open circuited lines will be
  • 0
  • 1
  • -1
  • ∞
Answer: ∞
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