On This Page

This set of Electromagnetics Multiple Choice Questions & Answers (MCQs) focuses on Electromagnetics Set 19

Q1 | Find the receiving impedance of a transmission line having a voltage of 24Vand a conduction current of 1.2A is
  • 25.2
  • 22.8
  • 28.8
  • 20
Q2 | The characteristic impedance of a transmission line with impedance andadmittance of 16 and 9 respectively is
  • 25
  • 1.33
  • 7
  • 0.75
Q3 | Find the characteristic impedance expression in terms of the inductance andcapacitance parameters.
  • zo = √(lc)
  • zo = lc
  • zo = √(l/c)
  • zo = l/c
Q4 | When a transmission line has a load impedance same as that of thecharacteristic impedance, the line is said to be
  • parallel
  • perpendicular
  • polarized
  • matched
Q5 | The wavelength of a line with a phase constant of 6.28 units is
  • 2
  • 1
  • 0.5
  • 3.14
Q6 | The wavelength of a wave with a frequency of 6 GHz in air is
  • 50
  • 5
  • 0.5
  • 0.05
Q7 | The phase constant of a wave with a wavelength of 2 units is given by
  • 2
  • 3.14
  • 6.28
  • 1
Q8 | The frequency of a wave travelling in a transmission line with velocity 4 x 108and wavelength 3 units is
  • 0.75 ghz
  • 0.133 ghz
  • 7.5 ghz
  • 1.33 ghz
Q9 | The velocity and phase constant relation is given by
  • v = ω/β
  • v = ωβ
  • v = β/ω
  • vωβ = 1
Q10 | The electrical length in a transmission line refers to the
  • product of attenuation constant and length
  • ratio of attenuation constant and length
  • product of phase constant and length
  • ratio of phase constant and length
Q11 | The unit of attenuation constant is
  • decibel
  • bel
  • neper
  • no unit
Q12 | The propagation constant of a wave with attenuation and phase constantgiven by 2 and 3 respectively is
  • 2 – 3j
  • 3 – 2j
  • 2 + 3j
  • 3 + 2j
Q13 | The velocity of wave in the air medium is
  • 1 x 108
  • 1.5 x 108
  • 3 x 108
  • 1 x 109
Q14 | Identify the secondary parameter from the options given below.
  • resistance
  • conductance
  • phase constant
  • capacitance
Q15 | Which of the following parameters does not exist in the transmission lineequation?
  • r
  • zo
  • zl
  • propagation constant
Q16 | For an infinite transmission line, the characteristic impedance is given by 50ohm. Find the input impedance.
  • 25
  • 100
  • 2500
  • 50
Q17 | The best transmission length for effective transmission of power is
  • l = λ/4
  • l = λ/8
  • l = λ/2
  • l = ∞
Q18 | When the length of the transmission line is same as that of the wavelength,then which condition holds good?
  • zin = zo
  • z = zo
  • zl = zo
  • zin = zl
Q19 | The input impedance of a half wave transmission line with a load impedanceof 12.5 ohm is
  • 25
  • 50
  • 6.25
  • 12.5
Q20 | The condition for a quarter wave transformer is
  • zo2 = zin zl
  • zo = zin zl
  • zl2 = zin zo
  • zo = zin
Q21 | Find the characteristic impedance of a quarter wave with input and loadimpedances given by 50 and 25 respectively.
  • 50
  • 25
  • 75
  • 35.35
Q22 | Find the load impedance in a quarter line transformer with characteristicimpedance of 75 ohm and input impedance of 200 ohm.
  • 28.125
  • 12.285
  • 52.185
  • 85.128
Q23 | The purpose of the transmission line equation is to
  • find primary parameters
  • find secondary parameters
  • find the reflection cofficient
  • impedance matching
Q24 | The quarter wave transformer can be considered as a
  • impedance inverter
  • impedance doubler
  • impedance tripler
  • impedance quadrupler