# Lange Coupler MCQ’s

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

1. Lange couplers consist of four parallel lines that are ______ coupled.
a) tightly
b) loosely
c) partially
d) none of the mentioned

2. Lange coupler is a type of Quadrature hybrid.
a) true
b) false

3. The major disadvantage of coupled line coupler is:
a) complex construction
b) low power gain
c) higher loss
d) none of the mentioned

4. A major disadvantage of Lange coupler is:
a) high power loss
b) complex construction
c) low gain
d) none of the mentioned

5. Even mode characteristic impedance of a Lange coupler:
a) (Vp.Cep)-1
b) Vp.Cep
c) (Vp.Lep)-1
d) Vp.Lep

6. For a 4 wire Lange coupler, if the odd mode and even mode capacitances are 12pF and 9pF respectively, then the equivalent capacitance in terms of two wired coupled line in even mode is:
a) 15.1 pF
b) 16.7 pF
c) 12 pF
d) 9 pF

7. For even mode excitation of a Lange coupler, all the four lines of the Lange coupler are at:
a) equal potential
b) zero potential
c) unequal potential
d) negative potential

8. In a Lange coupler having 4 lines, the adjacent lines are connected so as to act as two conductors in parallel.
a) true
b) false

9. For a 4 wire Lange coupler, if the odd mode and even mode capacitances are 12pF and 9pF respectively, then the equivalent capacitance in terms of two wired coupled line in odd mode is:
a) 18.56 pF
b) 25.71 pF
c) 42 pF
d) 31.6 pF

10. The phase velocity of the waves in both even and odd mode of a Lange coupler is equal.
a) true
b) false