Exercise: Networks Analysis And Synthesis

Questions for: Networks Analysis And Synthesis

A square current wave of magnitude 1 A is applied to an element for 5 seconds. The voltage across the element rises linearly from 0 to final value linearly. The element is
A:
resistance
B:
inductance
C:
capacitance
D:
R and C in series
Answer: C

Charge across capacitance increases linearly. Since capacitance is constant, voltage increases linearly.

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Given Is = 20 A, Vs = 20 V, the current I in the 3 Ω resistance is given by
A:
4 A
B:
8 A
C:
2 A
D:
16 A
Answer: A

Is = 20, vs = 20

Using superposition theorem with vs = 0

Is = 0, current in 3Ω in opposite direction, net current 8A - 4A 4A.

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In figure, E = 1 V (rms value). The average power is 250 mW. Then phase angle between E and I is
A:
90°
B:
60°
C:
45°
D:
30°
Answer: B

EI cos θ = 0.25 or I cos θ = 0.25

From above equations cos θ = 0.707 and θ = 45°.

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If the iron core of a coil is removed so that it becomes an air cored coil, its inductance
A:
will increase
B:
will decrease
C:
will remain the same
D:
may increase or decrease
Answer: B

μr for air is 1 while μr for iron is more than 1.

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Three inductors each 30 mH are connected in delta. The value of inductance or each arm of equivalent star is
A:
10 mH
B:
15 mH
C:
30 mH
D:
90 mH
Answer: A

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