# Circular Waveguide Cavity Resonators MCQ’s

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

1. The dominant mode in the cylindrical cavity resonator is TE_{101} mode.

a) true

b) false

2. Circular cavities are used for microwave frequency meters.

a) true

b) false

3. A cylindrical cavity resonator can be constructed using a circular waveguide.

a) shorted at both the ends

b) open at both the ends

c) matched at both the ends

d) none of the mentioned

4. The mode of the circular cavity resonator used in frequency meters is:

a) TE_{011} mode

b) TE_{101} mode

c) TE_{111} mode

d) TM_{111} mode

5. A circular cavity resonator is filled with a dielectric of 2.08 and is operating at 5GHz of frequency. Then the wave number is:

a) 181

b) 151

c) 161

d) 216

6. The loss tangent for a circular cavity resonator is 0.0004.Then the unloaded Q due to dielectric loss is:

a) 1350

b) 1560

c) 560

d) 2500

7. The propagation constant of TEmn mode of propagation for a cylindrical cavity resonator is:

a) √ (k^{2}-(p_{nm}/a)^{2})

b) √ p_{nm}/a

c) √ (k^{2}+(p_{nm}/a)^{2})

d) none of the mentioned

8. Given that the wave number of a circular cavity resonator is 151 (TE_{011} mode), and the length of the cavity is twice the radius of the cavity, the radius of the circular cavity operating at 5GHz frequency is:

a) 2.1 cm

b) 1.7 cm

c) 2.84 cm

d) insufficient data

9. A circular cavity resonator has a wave number of 151, radius of 2.74 cm, and surface resistance of 0.0184Ω. If the cavity is filled with a dielectric of 2.01, then unloaded Q due to conductor loss is:

a) 25490

b) 21460

c) 29390

d) none of the mentioned

10. If unloaded Q due to conductor loss and unloaded Q due to dielectric loss is 29390 and 2500 respectively, then the total unloaded Q of the circular cavity is:

a) 2500

b) 29390

c) 2300

d) 31890