Electronics and Communication Engineering - Networks Analysis and Synthesis

46.
If A = 3 + j1, A4 =
3.16 ∠18.4°
100 ∠73.72°
100 ∠18.4°
3.16 ∠73.22°
Answer: Option
Explanation:

3 + j1 = 10∠18.43° = (10)4


47.
In a two terminals network the O.C. voltage measured at the given terminals is 100 V and s.c., currents at the same terminals 5 A. If a load of 80 Ω resistance is connected at the terminals, load current is
1 A
1.25 A
6 A
6.25 A
Answer: Option
Explanation:


48.
Figure shows a dc circuit fed by a current source. With respect to terminals AB, Thevenin's voltage and Thevenin's resistance are
VTH = 5 V, RTH = 0.75 Ω
VTH = 2.5 V, RTH = 0.75 Ω
VTH = 2.5 V, RTH = 1 Ω
VTH = 5 V, RTH = 1 Ω
Answer: Option
Explanation:


49.
Colour code of carbon resistors has only two bands.
True
False
Answer: Option
Explanation:

It has four bands.


50.
A coil has resistance R and inductance L. At ω = ∞ the phase angle between voltage and current is
180°
45°
90°
Answer: Option
Explanation:

When ω = ∞, XL = ωL = ∞.