# Network Theory Questions and Answers – Frequency Response of Reactive One-Ports

This set of Network Theory Questions and Answers for Campus interviews focuses on “Frequency Response of Reactive One-Ports”.

1. Based on the location of zeros and poles, a reactive one-port can have ____________ types of frequency response.
a) 1
b) 2
c) 3
d) 4

Explanation: A reactive one-port can have four types of frequency response based on the location of zeros and poles.
(i) frequency response with two external poles
(ii) frequency response with two external zeros
(iii) frequency response with an external zero ω = 0 and an external poles at ω = ∞
(iv) frequency response with an external zero ω = ∞ and an external poles at ω = 0.

2. A driving point impedance with poles at ω = 0, ω = ∞ must have ___________ term in the denominator polynomial.
a) s
b) s+1
c) s+2
d) s+3

Explanation: As there is a pole at ω = 0, (s-jω)=s. Poles are written in the denominator of Z(s). So there will be s term in the denominator polynomial in a driving point impedance function Z(s).

3. A driving point impedance with poles at ω = 0, ω = ∞ must have excess ___________ term in the numerator polynomial.
a) s1n1
b) s1n2
c) s2n2
d) s2n1

Explanation: The driving point impedance of the one-port is infinite, and it will not pass either direct current or alternating current of an infinitely high frequency.

4. A driving point impedance with zeros at ω = 0, ω = ∞ must have ___________ term in the numerator polynomial.
a) s+3
b) s+2
c) s+1
d) s

Explanation: As there is a zero at ω = 0, (s-jω)=s. Zeros are written in the numerator of Z(s). So there will be s term in the numerator polynomial in a driving point impedance function Z(s).

5. A driving point impedance with zeros at ω = 0, ω = ∞ must have an excess ___________ term in the denominator polynomial.
a) s2n1
b) s2n2
c) s1n2
d) s1n1

Explanation: The driving point impedance of the one-port is zero, and it will pass both direct current and an alternating current of an infinitely high frequency.
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6. A driving point impedance with zero at ω = 0 and pole at ω = ∞ must have ___________ term in the numerator polynomial.
a) s+1
b) s
c) s+3
d) s+2

Explanation: As ω = 0, (s-jω)=s. The numerator of Z(s) contains poles and denominator contains zeros. So there will be s term in the numerator polynomial.

7. A driving point impedance with zero at ω = 0 and pole at ω = ∞ must have ___________ term in the numerator polynomial.
a) s1n1
b) s2n1
c) s1n2
d) s2n2

Explanation: If a pole is at ω = ∞, there will be an equal number of s2n2 type terms in the numerator polynomial and the denominator polynomial.

8. A driving point impedance with zero at ω = 0 and pole at ω = ∞ must have ___________ term in the denominator polynomial.
a) s2n2
b) s1n1
c) s2n1
d) s1n2

Explanation: If there is a zero at ω = 0 and pole at ω = ∞, the one-port will pass direct current and block the alternating current of an infinitely high frequency.

9. A driving point impedance with pole at ω = 0 and zero at ω = ∞ must have ___________ term in the denominator polynomial.
a) s
b) s+3
c) s+1
d) s+2

Explanation: s-jω = (s-j(0)) = s. As pole is at ω = 0, there will be s term in the denominator polynomial.

10. A driving point impedance with pole at ω = 0 and zero at ω = ∞ must have ____________ term in the numerator and denominator.
a) s1n2
b) s2n2
c) s1n1
d) s2n1

Explanation: If a pole at ω = 0 and zero at ω = ∞, the one-port will block the direct current and pass the alternating current of an infinitely high frequency.

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