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1723.

Consider the following polynomials:
1. s⁴ + 7s³ +17s² +17s + 6 =0
2. s⁴ +11s³ + 41s² + 61s + 30=0
3. s⁴ + s³ + 2s² + 3s + 2=0
Among these polynomials, those which are Hurwitz would include
a. 1 and 3
b. 2 and 3
c. 1 and 2
d. 1,2 and 3

asked in Electrical Paper-1, 1997

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1724.

Consider the following statements:
I : Any function in ‘s’ which can be expressed as a ratio of any two arbitrary polynomials in ‘scan be realized as a driving- point function of a passive network.
II: Any function in ‘s’ which can be expressed as a ratio of two arbitrary polynomials in ‘s’, is a positive ,real function.
Of these statements
a. both I and II are true
b. I is true but 11 is false
c. both I and II are false
d. I is false but II is true

asked in Electrical Paper-1, 1997

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1725.

Match List - I with List - II for the twoport network shown in the given figure and select the correct answer.

List I
A. Z₁₁
B. Z₁₂
C. Z₂₁
D. Z₂₂ List II
1. R
2. R+L
3. R-Ls
4. R+Ls

a. A→1, B→2, C→1, D→4
b. A→2, B→1, C→1, D→3
c. A→1, B→1, C→1, D→4
d. A→2, B→1, C→3, D→4

asked in Electrical Paper-1, 1997

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1726.

Consider the following statements:
1. The two-port network shown below does NOT have an impedance matrix representation.

2. The following two-port network does NOT have an admittance matrix representation.

3. A two-port network is said to be reciprocal if it satisfies z₁₂ = z₂₁
Of these statements
a. 1 and 2 are correct
b. 1, 2 and 3 are correct
c. 1 and 3 are correct
d. None is correct

asked in Electrical Paper-1, 1997

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1727.

The pole-zero configuration of a network transfer function is shown in the given figure. The magnitude of the transfer function will

a. Decrease with frequency
b. Increase with frequency
c. Initially increase and then decrease with frequency
d. Be independent of frequency

asked in Electrical Paper-1, 1997

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1728.

After closing the switch ‘S’ at t = 0, the current i(t) at any instant ‘t’ in the network shown in the given figure will be

a. 10 +10e^100t
b. 10 −10e^100t
c. 10 +10e^−100t
d. 10 −10e^−100t

asked in Electrical Paper-1, 1997

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