Electronics and Communication Engineering - Networks Analysis and Synthesis

26.
If A = 3 + j1 and B = 4 + j3, A - B =
8.062 ∠29.7°
10 ∠45°
2.236 ∠243.43°
6.72 ∠243.43°
Answer: Option
Explanation:

A - B = - 1 - j2 = 2.236∠243.43°.


27.
Two impedances 10 - j 10 and 10 + j 10 are connected in parallel. Their combined impedance is
5 + j5
5 - j5
10 + j0
20 - j10
Answer: Option
Explanation:


28.
Resistivity of semiconductors is around 100 Ω-m.
True
False
Answer: Option
Explanation:

Resistivity of semiconductors is about 1 ohm-m.


29.
Two capacitors of 20 μF each are in series. The total capacitance is
5 μF
10 μF
40 μF
400 μF
Answer: Option
Explanation:


30.
Thevenin's theorem is used to find current in a branch of a network. It is now desired to find current in another branch of the network
the same Thevenin's circuit can be used
the same Thevenin's circuit with some modification can be used
it is necessary to find new Thevenin's circuit
either (b) or (c)
Answer: Option
Explanation:

Thevenin's equivalent circuit with respect to particular terminals only.