# Excitation of Resonators MCQ’s

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

1. A measure of the level of coupling between a resonator and a feed is given by:
a) coupling coefficient
b) power transfer coefficient
c) voltage coefficient
d) reflection coefficient

2. To obtain maximum power transfer between a resonator and feed line, the resonator should be matched to the load at:
a) resonant frequency
b) cutoff frequency
c) zero frequency
d) none of the mentioned

3. The level of coupling required between a resonator and its attached circuitry is a standard and independent of the application where coupling is required.
a) true
b) false

4. When impedance matching is done between a resonator and a feed line, the condition for impedance matching is:
a) R=Z0
b) R=Z0/2
c) R=2Z0
d) R=√Z0

5. When the coupling coefficient is lesser than one, the resonator is over coupled to the feed line.
a) true
b) false

6. For practical applications cavity resonators can be modified as per the requirement of the application where it is used.
a) true
b) false

7. Coupling coefficient Q can be defined as the ratio of unloaded Q to external Q.
a) true
b) false

8. Direct measurement of the unloaded Q of a resonator is not possible.
a) true
b) false

9. When coupling coefficient is 1, the resonator is ________ to the feed line.
a) under coupled
b) over coupled
c) critically coupled
d) none of the mentioned

10. In aperture coupling, a small aperture in the transverse wall of the waveguide acts as:
a) shunt inductance
b) shunt capacitance
c) series inductance
d) series capacitance