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

1. Short circuited λ/2 transmission line has a quality factor of:

a) β/2α

b) 2β/α

c) β/α

d) Z0/ZL

2. Quality factor of a coaxial cable transmission line is independent of the medium between the wires of the transmission line.

a) True

b) False

3. Lumped elements can be used to make resonators that rare to be operated at microwave frequencies.

a) True

b) False

4. A coaxial cable is air filled with air as dielectric with inner and outer radius equal to 1 mm and 4 mm. If the surface resistivity is 1.84*10-2Ω,then the attenuation due to conductor loss is:

a) 0.011

b) 0.022

c) 0.11

d) 0.22

5. The equivalent resistance of a short circuited λ/4 transmission line is independent of the characteristic impedance of the transmission line.

a) True

b) False

6. If the attenuation due to dielectric loss and attenuation due to conductor loss in a microstrip transmission line is 0.024Np/m and 0.0724 Np/m, then the unloaded quality factor if the propagation constant is 151 is:

a) 150

b) 783

c) 587

d) 234

7. An air coaxial cable has attenuation of 0.022 and phase constant of 104.7, then the quality factor of a λ/2 short circuited resonator made out of this material is:

a) 2380

b) 1218

c) 1416

d) Insufficient data

8. A microstrip patch antenna has a width of 5.08mm and surface resistivity of 1.84*10^{-2}. Then the attenuation due to conductor loss is:

a) 0.0724

b) 0.034

c) 0.054

d) None of the mentioned

9. The equivalent capacitance of a short circuited λ/4 transmission line is dependent on the characteristic impedance of the transmission line.

a) True

b) False

10. Inductance of an open circuited λ/2 transmission line is dependent on the characteristic impedance of the transmission line.

a) True

b) False