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Electronics and Communication Engineering - Electronic Devices and Circuits

Exercise : Electronic Devices and Circuits - Section 6
26.
A network has 10 nodes and 17 branches. The number of different node pair are
7
9
10
45
Answer: Option
Explanation:

One node is reference node. Therefore the system has 9 node pairs.

27.
In a series RC circuit Z = (R2 + ω2C2)0.5.
True
False
Answer: Option
Explanation:

28.
The time constant of the network shown in figure is
RC
3 RC
Answer: Option
Explanation:

Time constant t = C Req

.

29.
If V = 20 + j20, then loge(A) A is
3.342 + j 45
28.28 ∠45°
400 ∠45°
3.342 + j 0.785
Answer: Option
Explanation:

20 x j 20 = 28.28 Ð45° loge V = loge (28.28) + = 3.342 j.785.

30.
In an ac network the sum of currents entering a node is 10 ∠45°. The sum of currents leaving the node is
19.32 ∠45°
15 ∠45°
20 ∠45°
zero
Answer: Option
Explanation:

As per KCL sum of currents entering a node is equal to sum of currents leaving a node.

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