Exercise: Networks Analysis And Synthesis

Questions for: Networks Analysis And Synthesis

For H(s) to be positive real, the condition Re[H(jω)] ≥ 0 for 0 ≤ ω ≤ ∞ is
A:
a necessary condition
B:
a sufficient condition
C:
a necessary and sufficient condition
D:
is not a necessary condition
Answer: A

H(s) must possess two more properties if it is positive real.

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The rms voltage measured across each of the circuit element in figure is as shown, when the circuit is excited by a sinusoidal voltage Es, the rms value of the source voltage es is
A:
10 volt
B:
2 volt
C:
Es
D:
5 volt
Answer: D

Voltage across C = -10jv

Voltage across L = + 14 jv

source voltage Es = VR + jVL - jVC = 3 + j. 14 - j. 10 3 + j4

rms of Es = VR2(VL - VC)2 = 32 + 42 5 volt.

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In a lead acid cell, the positive plate has spongy lead.
A:
True
B:
False
C:
D:
Answer: B

The positive plate has lead peroxide.

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The self inductances of two coils are 27 H and 3 H. If the winding or coils is such that 50% of flux of one links the other, the mutual inductance is
A:
30 H
B:
24 H
C:
9 H
D:
4.5 H
Answer: D

M = 0.5(27 x 3)

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The resistance of the circuit shown is figure is
A:
5 Ω
B:
More than 6 Ω
C:
More than 4 Ω
D:
Between 6 and 7 Ω
Answer: A

The parallel combination of 3, 5 and 4 ohm is short-circuited. Therefore their net resistance is zero.

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