Terminated Lossless Transmission Lines – 2 MCQ’s

Electronics & Communication Engineering RF & Microwave Circuit Design

This set of RF & Microwave Circuit Design Multiple Choice Questions & Answers (MCQs) focuses on “Terminated Lossless Transmission Lines – 2″.

1. Input impedance of a short circuited transmission line is :
a) -jZ0tanβl
b) jZ0tanβl
c) jZ0cotβl
d) – jZ0cotβl

2. 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

3. 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)

4. If a ƛ/3 transmission line is short circuited that has a characteristic impedance of 50 Ω, then its input impedance is:
a) -j100Ω
b) 50Ω
c) 86.60Ω
d) –j86.60Ω

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

6. If a λ/3 transmission line is open circuited and has characteristic impedance of 50 Ω then the input impedance is:
a) j28.86Ω
b) 50Ω
c) j50Ω
d) 28.86Ω

7. Expression for input impedance of an Open circuited transmission line is:
a) -jZ0tanβl
b) jZ0tanβl
c) jZ0cotβl
d) -jZ0cotβl

8. For a λ/2 transmission line, if the characteristic impedance of the line is 50 Ω and the terminated with a load of 100 Ω, then its input impedance is:
a) 100Ω
b) 50Ω
c) 88.86Ω
d) none of the mentioned

9. 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)

10. If the transmission coefficient of a transmission line is 1.6, then the reflection co efficient is:
a) 0.8
b) 0.6
c) 0.4
d) 0.3

11. 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

12. For a transmission line, if the reflection coefficient is 0.4, then the transmission coefficient is:
a) 0.4
b) 1.4
c) 0.8
d) 2.8

13. For a transmission line, if the transmission coefficient is 1.4, then the insertion loss in dB is:
a) -2.922dB
b) 29dB
c) 1.46dB
d) -29dB

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