# Coupled Line Directional Couplers MCQ’s

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

1. The number of conductors used in the construction of coupled line couplers is fixed.
a) true
b) false

2. The mode of propagation of propagation supported by coupled line couplers is:
a) TM mode
b) TE mode
c) TEM mode
d) quasi TEM mode

3. In coupled line directional couplers, power from one line to another is transmitted through a microstrip line running between them.
a) true
b) false

4. Coupled line couplers are:
a) symmetric couplers
b) asymmetric couplers
c) in phase couplers
d) type of hybrid coupler

5. If the coupling coefficient of a coupled line coupler is 0.1 and the characteristic impedance of the material is 50 Ω, then the odd mode characteristic impedance is:
a) 45.23 Ω
b) 50 Ω
c) 38 Ω
d) none of the mentioned

6. Multisection couplers have a very narrow operational bandwidth which is a major disadvantage.
a) true
b) false

7. For coupled line coupler, if the voltage coupling factor is 0.1 and the characteristic impedance of the microstrip line is 50 Ω, even mode characteristic impedance is:
a) 50.23 Ω
b) 55.28 Ω
c) 100 Ω
d) 80.8 Ω

8. Dielectric and conductor loss have no effect on the directivity of the coupled line coupler.
a) true
b) false

9. Three section binomial couplers have very low directivity as compared to other coupler designs.
a) true
b) false

10. The capacitance per unit length of broadside parallel lines with width W and separation d is:
a) ∈W/d
b) ∈d/W
c) dW/∈
d) none of the mentioned