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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