Exercise: Networks Analysis And Synthesis

Questions for: Networks Analysis And Synthesis

A series RLC circuit has Q = 5. A voltage of 10 V rms is applied to it. At resonance, the voltage across C is
A:
10 V rms
B:
10 V peak
C:
50 V rms
D:
50 V peak
Answer: C

VC = QV = 50 V rms.

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Two capacitors of 1 μF and 2 μF are connected in series across a 10 V dc battery. After the capacitors have been charged, the charges across the two capacitors will be
A:
10 μC each
B:
20 μC each
C:
10 μC and 20 μC
D:
20 μC and 10 μC
Answer: B

Since capacitors are in series, charge will be same.

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If Va0, Va1, Va2 are sequence components of Va and Ia0, Ia1, Ia2 are sequence components of Ia, then total 3 phase power P is given by
A:
P = Va0Ia0 + Va1Ia1 + Va2Ia2
B:
P = Va0Ia0 + Va1Ia1 + Va2Ia2*
C:
P = 3(Va0Ia0 + Va1Ia1 + Va2Ia2)
D:
P = 3(Va0Ia0 + Va1Ia1 + Va2Ia2*)
Answer: D

There are a total of 9 components (Three for each phase). Moreover, in general, P = VI*.

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For the ladder network of figure, open circuit driving point impedance at port 1 =
A:
B:
C:
D:
Answer: D

s domain impedance of each inductance = 2s and that of each capacitor is .

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A choke coil has a resistance to reactance ratio of 0.2. The power factor of the choke coil is
A:
less than 0.2 lagging
B:
less than 0.2 leading
C:
about 1
D:
about 0
Answer: A

Therefore, cos Ω = 0.196 lagging.

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