Electronics and Communication Engineering - Networks Analysis and Synthesis

16.
A wave trap is a
series tuned circuit
a parallel tuned circuit
either a series tuned circuit or parallel tuned circuit
none of the above
Answer: Option
Explanation:

It has R and L in one branch and a variable capacitance in second branch.


17.
In following circuit, steady state is reached with S open, S is closed at t = 0, the current I at t = 0+ is given by
9 Ω
6 Ω
7 Ω
10 Ω
Answer: Option
Explanation:

When steady state is reached with s open, capacitor will act as open circuit

Current in 4Ω resistor will be = 6A at steady state.

Voltage across 4Ω = 6 x 4 24 volt.

Current in 2Ω resistor due to 6A 3A current due to 16 V, source.

I = 16/2 8A, this current divide in (2 + 2) Ω is 4Ω resistor current in 2Ω resistor 4A + 3A 7A.


18.
In an ac series RLC circuit the maximum phase difference between any two voltages can be
90°
45°
- 90°
180°
Answer: Option
Explanation:

Voltage across inductance leads the current by 90° and voltage across capacitance lags the current by 90°.


19.
In a series circuit with XL constant and R variable the current locus lies in the third quadrant.
True
False
Answer: Option
Explanation:

it lies in fourth quadrant.


20.
One coulomb charge is equal to the charge on
6.24 x 1018 electrons
6.24 x 1024 electrons
6.24 x 1018 atoms
none of the above
Answer: Option
Explanation:

As per definition 1C = 6.24 x 1018 electrons.