# Terminated Lossless Transmission Lines – 1 MCQ’s

This set of RF & Microwave Circuit Design Multiple Choice Questions & Answers (MCQs) focuses on “Terminated Lossless Transmission Lines – 1″.

1. We say a transmission line is matched when:

a) Z_{L}=Z_{0}

b) Z_{L}=√Z_{0}

c) Z_{L}=Z_{0}/2

d) Z_{L}=2Z_{0}

2. Voltage reflection coefficient can be defined as:

a) ratio of amplitude of reflected voltage wave to the transmitted voltage wave

b) ratio of amplitude of reflected voltage to the incident voltage wave

c) ratio of load impedance to the characteristic impedance of the transmission line

d) none of the mentioned

3. When a lossless line is terminated with an arbitrary load impedance Z_{L}, then it :

a) causes wave reflection on transmission lines

b) transmits the entire supplied power

c) causes loss in transmission line

d) none of the mentioned

4. Expression for a voltage reflection co-efficient in terms of load impedance and characteristics impedance is:

a) (Z_{L}– Z_{0})/(Z_{L}+ Z_{0})

b) (Z_{L}+ Z_{0})/(Z_{L}– Z_{0})

c) Z_{L}. Z_{0}/( Z_{L}+ Z_{0})( Z_{L}-Z_{0})

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

5. Return loss for a transmission line in terms of its reflection co efficient is given by:

a) -20logl┌l in dB where ┌ is the reflection coefficient.

b) -10logl┌l in dB where ┌ is the reflection coefficient

c) -10log (1/l┌l) in dB where ┌ is the reflection coefficient

d) -20log (1/l┌l) in dB where ┌ is the reflection coefficient

6. Expression for VSWR in terms of reflection co-efficient is:

a) (1+│┌│)/(1-│┌│)

b) (1-│┌│)/(1+│┌│)

c) 1/│┌│

d) 1/1+│┌│

7. If a transmission line of a characteristics impedance 50 Ω is terminated with a load impedance of 100 Ω, then the reflection co efficient is:

a) 0.3334

b) 0.6667

c) 1.6

d) 1.333

8. If the reflection coefficient for transmission line is 0.24, then the return lossin dB is:

a) 12.39dB

b) 15dB

c) -12.39dB

d) -15.2dB

9. If the reflection co-efficient for a transmission line is 0.3, then the VSWR is:

a) 0.5384

b) 1.8571

c) 0.4567

d) 3.6732

10. If a transmission line of characteristic impedance 50 Ω is terminated with a load impedance of 150 Ω, then VSWR is:

a) 0.75

b) 0.5

c) 2

d) none of the mentioned