Q.1
Expression for input impedance of a transmission line in terms of load impedance and characteristic impedance is:
  • a) Z0 (ZL+j Z0tan βl)/ (Z0+j ZLtan βl)
  • b) (Z0+j ZLtan βl)/ (ZL+j Z0tan βl)
  • c) Z0 (ZL-j Z0tan βl)/ (Z0-j ZLtan βl)
  • d) (Z0-j ZLtan βl)/ (ZL-j Z0tan βl)
Q.2
Input impedance of a short circuited transmission line is :
  • a) -jZ0tanβl
  • b) jZ0tanβl
  • c) jZ0cotβl
  • d) – jZ0cotβl
Q.3
Input impedance of a transmission line can be represented in terms of this simple trigonometry function.
  • a) sine function
  • b) cosine function
  • c) cotangent function
  • d) tangent function
Q.4
Expression for input impedance of an Open circuited transmission line is:
  • a) -jZ0tanβl
  • b) jZ0tanβl
  • c) jZ0cotβl
  • d) -jZ0cotβl
Q.5
Input impedance of a open circuited transmission line is represented using this trigonometric function:
  • a) sine function
  • b) cosine function
  • c) cotangent function
  • d) tangent function
Q.6
Expression for a transmission co-efficient of a transmission line is :
  • a) 2ZL/ ( ZL+Z0)
  • b) (ZL-Z0)/ (ZL+Z0)
  • c) 2Z0/( ZL+Z0)
  • d) (ZL+Z0)/ (ZL-Z0)
Q.7
For a transmission line, if the reflection coefficient is 0.then the transmission coefficient is:
  • a) 0.4
  • b) 1.4
  • c) 0.8
  • d) 2.8
Q.8
If the transmission coefficient of a transmission line is 1. then the reflection co efficient is:
  • a) 0.8
  • b) 0.6
  • c) 0.4
  • d) 0.3
Q.9
For a transmission line, if the transmission coefficient is 1. then the insertion loss in dB is:
  • a) -2.922dB
  • b) 29dB
  • c) 1.46dB
  • d) -29dB
Q.10
The relation between nepers and decibels is:
  • a) 1 Np= 8.686 dB
  • b) 1 dB=8.868 dB
  • c) Np≥dB
  • d) dB≥Np
Q.11
If a ƛ/3 transmission line is short circuited that has a characteristic impedance ofΩ, then its input impedance is:
  • a) -j100Ω
  • b) 50Ω
  • c) 86.60Ω
  • d) –j86.60Ω
Q.12
For a λ/transmission line, if the characteristic impedance of the line isΩ and the terminated with a load ofΩ, then its input impedance is:
  • a) 100Ω
  • b) 50Ω
  • c) 88.86Ω
  • d) none of the mentioned
Q.13
If a λ/3 transmission line is open circuited and has characteristic impedance ofΩ then the input impedance is:
  • a) j28.86Ω
  • b) 50Ω
  • c) j50Ω
  • d) 28.86Ω
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