# Reflections MCQ’s

This set of RF & Microwave Circuit Design Multiple Choice Questions & Answers (MCQs) focuses on “Reflections”.

1. The overall reflection coefficient of a matching quarter wave transformer cannot be calculated because of physical constraints.

a) True

b) False

2. In the multiple reflections analysis method, the total reflection is:

a) An infinite sum of partial reflections

b) An infinite sum of partial reflection and transmissions

c) Constant value

d) Finite sum of partial reflections

3. Discontinuities in the matching quarter wave transformer are not of considerable amount and are negligible.

a) True

b) False

4. The expression for total reflection in the simplified form is given by:

a) Г=Г_{1}+ Г_{3}e^{-2jθ}

b) Г=Г1_{1}+Г_{3}

c) Г=Г_{12}+ Г_{3}e^{-2jθ}

d) Г= Г_{1}+ Г_{2}e^{-2jθ}

5. If the first and the third reflection coefficients of a matched line is 0.2 and 0.01, then the total reflection coefficient if quarter wave transformer is used for impedance matching is:

a) 0.2

b) 0.01

c) 0.21

d) 0.19

6. To compute the total reflection of a multi-section transmission line, the lengths of the transmission lines considered are all unequal.

a) True

b) False

7. The e^{-2jθ} term in the expression for total reflection in a single section quarter wave transformer impedance matching network Г=Г_{1}+ Г_{3}e^{-2jθ} signifies:

a) Phase delay

b) Frequency change

c) Narrowing bandwidth

d) None of the mentione

8. If a λ/4 transmission line is used for impedance matching, then always Г_{1}> Г_{3}.

a) True

b) False

9. If Z_{L}< Z_{0}, then the reflection coefficient at that junction is:

a) Г_{N}<0

b) Г_{N}>0

c) Г_{N}>1

d) None of the mentioned

10. Using the relation for total reflection co-efficient certain designs of matching networks can be made as per practical requirements.

a) True

b) False

11. The total approximate reflection coefficient is a finite sum of reflection co-efficient of individual matching section of the matching network.

a) True

b) False