Quarter Wave Transformer(Smith Chart) MCQ’s

Electronics & Communication Engineering RF & Microwave Circuit Design

This set of RF & Microwave Circuit Design Multiple Choice Questions & Answers (MCQs) focuses on “Quarter Wave Transformer(Smith Chart)”.

1. Major advantage of a quarter wave transformer is:
a) It gives proper matching
b) It gives high gain
c) Broader bandwidth
d) None of the mentioned

2. If a narrow band impedance match is required, then more multi section transformers must be used.
a) True
b) False

3. A quarter wave transformer is useful for matching any load impedance to a transmission line.
a) True
b) False

4. The major drawback of the quarter wave transformer that it cannot match complex load to a transmission line cannot be overcome.
a) True
b) False

5. Converting complex load into real load for impedance matching has no effect on the bandwidth of the match.
a) True
b) False

6. Quarter wave transformers cannot be used for non-TEM lines for impedance matching.
a) True
b) False

7. Complex load impedance can be converted to real load impedance by:
a) Scaling down the load impedance
b) By introducing an approximate length of transmission line between load and quarter wave transformer
c) Changing the operating wavelength
d) None of the mentioned

8. If a single section quarter wave transformer is used for impedance matching at some frequency, then the length of the matching line is:
a) Is different at different frequencies
b) Is a constant
c) Is λ/2 for other frequencies
d) None of the mentioned

9. The reactances associated with the transmission line due to discontinuities:
a) Can be ignored
b) Have to matched
C Discontinuities do not exist
d) None of the mentioned

10. If a load of 10Ω has to be matched to a transmission line of characteristic impedance of 50Ω, then the characteristic impedance of the matching section of the transmission line is:
a) 50Ω
b) 10Ω
c) 22.36Ω
d) 100Ω

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