# Terminated Lossless Transmission Lines – 2 MCQ’s

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) -jZ_{0}tanβl

b) jZ_{0}tanβl

c) jZ_{0}cotβl

d) – jZ_{0}cotβl

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) Z_{0} (Z_{L}+j Z_{0}tan βl)/ (Z_{0}+j Z_{L}tan βl)

b) (Z_{0}+j Z_{L}tan βl)/ (Z_{L}+j Z_{0}tan βl)

c) Z_{0} (Z_{L}-j Z_{0}tan βl)/ (Z_{0}-j Z_{L}tan βl)

d) (Z_{0}-j Z_{L}tan βl)/ (Z_{L}-j Z_{0}tan 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) -jZ_{0}tanβl

b) jZ_{0}tanβl

c) jZ_{0}cotβl

d) -jZ_{0}cotβl

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) 2Z_{L}/ ( Z_{L}+Z_{0})

b) (Z_{L}-Z_{0})/ (Z_{L}+Z_{0})

c) 2Z_{0}/( Z_{L}+Z_{0})

d) (Z_{L}+Z_{0})/ (Z_{L}-Z_{0})

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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