Chebyshev Multi-Section Matching Transformers MCQ’s

Electronics & Communication Engineering RF & Microwave Circuit Design

This set of RF & Microwave Circuit Design Multiple Choice Questions & Answers (MCQs) focuses on “Chebyshev Multi-Section Matching Transformers”.

1. Advantage of chebyshev matching transformers over binomial transformers is:
a) higher gain
b) low power losses
c) higher roll-off in the characteristic curve
d) higher bandwidth

2. There are passband ripples present in the chebyshev characteristic curve.
a) true
b) false

3. The major disadvantage of binomial multi section transformer is higher bandwidth cannot be achieved.
a) true
b) false

4. Chebyshev matching transformers can be universally used for impedance matching in any of the microwave networks.
a) true
b) false

5. Chebyshev polynomials do not obey the equal-ripple property.
a) true
b) false

6. For values of x greater than 1, the chebyshev polynomial in its trigonometric form cannot be determined.
a) true
b) false

7. The 4th order chebyshev polynomial is:
a) 8x4-8x2+1
b) 4x3-4x2+1
c) 4x3-3x
d) none of the mentioned

8. Chebyshev polynomial can be expressed in trigonometric functions as:
a) Tn(cos θ)=cos nθ
b) Tn(sin θ)= sin nθ
c) Tn(cos θ)=cos nθ.sin nθ
d) none of the mentioned

9. Reflection co-efficient Гn in terms of Zn and Zn+1, successive impedances of successive sections in the matching network are:
a) 0.5 ln (Zn+1/Zn)
b) 0.5 ln (Zn/Zn+1)
c) ln (Zn+1/Zn)
d) ln (Zn/Zn+1)

10. If Г3=0.2 and Z3=50Ω, then the impedance of the next stage in the multi-section transformer is:
a) 100Ω
b) 50Ω
c) 74.6Ω
d) 22.3Ω

11. In a 3 section multisection chebyshev matching network, if Z3 = 100Ω, and Z2=50Ω, then the reflection co-efficient Г2 is:
a) 0.154
b) 0.3465
c) 0.564
d) none of the mentioned

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