# Transmission Lines as Circuit Elements MCQ’s

This set of Avionics Multiple Choice Questions & Answers (MCQs) focuses on “Transmission Lines as Circuit Elements”.

1. How does a shorted transmission line appear to a generator whose length is a quarter of the wavelength?
a) Very high impedance
b) Very low impedance
c) Short circuited line
d) RC tuned circuit

2. When a shorted line does looks like a series resonant circuit to the generator?
a) Length of line is one quarter wavelength
b) Length of line is one half wave lengths
c) Sorted line
d) Open line

3. How does a shorted transmission line appear to a generator whose length is a quarter of the wavelength?
a) Very high impedance
b) Very low impedance
c) Short circuited line
d) RC tuned circuit

4. When does a shorted transmission line look like an inductor to the generator?
a) Length is one quarter wavelength
b) Length is between one quarter and one half of wavelength
c) Length is more the one half of the wavelength
d) At all times

5. When does an open transmission line look like an inductor to the generator?
a) Length is one quarter wavelength
b) Length is between one quarter and one half of wavelength
c) Length is more the one half of the wavelength
d) At all times

6. The special transmission lines constructed on PCBs to act as tuned circuits is called as?
a) Stripline
b) Loop lines
c) Printed lines
d) Transmission lines

7. The characteristics of an open transmission line are just the opposite of shorted transmission line with respect to what the generator sees.
a) True
b) False

8. The impedance of a line is zero when ___________
a) It acts as inductor
b) It acts as capacitor
c) It acts as a resistor
d) Series resonant circuit

9. Which of the following is not true with respect to microstrip?
a) Used for transmission in UHF and microwave region
b) Copper is etched on an insulating base material
c) Point to point communications with wire are eliminated
d) Microstrip is ever onequarter or one-half wavelength long.

10. What is the transmission line in which a flat conductor is sandwiched between two ground planes?
a) Microstrip
b) Stripline
c) Coaxial line
d) Balanced line

11. A microstrip transmission line is to be used as a capacitor of 4 pF at 800 MHz. The PCB dielectric is 3.6. The microstrip dimensions are h = 0.0625 in, w = 0.13 in, and t = 0.002 in. What is the characteristic impedance of the line?
a) 48.9Ω
b) 12.3Ω
c) 54.3Ω
d) 65.7Ω

12. What is the characteristic impedance of microstrip with the dimensions h = 0.0625 in, w = 0.1 in, t = 0.003 in, and ε= 4.5?
a) 84.35Ω
b) 42.6Ω
c) 53.9Ω
d) 65.21Ω

13. Microstrip and striplines can be made by using monolithic, thin-film, and hybrid IC techniques to produce ________
a) Micro circuits
b) Microwave integrated circuits
c) Nano circuits
d) Embedded circuits

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