- For the circuit given in the figure, the Thevenin voltage and resistance as seen at AB are represented by

- Form factor is defined as ratio of
- Peak factor is defined as ratio of
- At resonance
Resonance is occurs at when inductive, capacitive reactance both are same i.e. , circuit is having only resistive components.
- A series R-L-C circuit has R=50 Ω, L=100 μH and C = 1 μF. The lower half power frequency of the circuit is
Ω _{1}.L −1 = − R Ω _{1}.C2πf _{1}X100X10^{ − 6}−1 = − 50 ⇒ f _{1}= 3.055 KHz2πf _{1}.X1X10^{ − 6} - The period of the function cosπ/4(t-1) is
Here 2π / T = π / 4 ⇒ T = 8 Second.
- A T-section lowpass filter has series inductor 80 mH and shunt capacitance 0.022 μF. What is the cutoff frequency?
L = 80 mH, C = 0.022 μF , f
_{c}(cutoff frequency) = 1 /π√(LC) = 1 / π√(80 × 10^{ − 3}) × (0.022 × 10^{ − 6}) = 7.58 KHz. - In a constant-k high pass filter having cutoff frequency of 12 kHz. Find out phase constant at 24 kHz?
β ( phase constant ) = 2sin
^{ − 1}(f_{c}/f) = 2sin^{ − 1}(12 × 10^{3}/24 × 10^{3}) = 60°. - In Constant K high- pass filter having cutoff frequency of 12 KHz. Find out attenuation at 4 KHz?
α ( attenuation ) = 2cosh
^{ − 1}(f_{c}/f) = 2cosh^{ − 1}(12 × 10^{3}/4 × 10^{3}) = 3.525 Neper. - Find out the series arm capacitance &s; shunt arm inductor in a constant K-high pass filter, when impedance R
_{0}= 600 Ω &s; cut off frequency = 4 Khz (Π - sec)C = 1 / 4πR_{0}f_{c}= 1 / (4π600 × 4000) = 0.033 μF and L = R_{0}/ 4πf_{c}= 600 / (4π × 4000) = 11.937 mH. - An RLC circuit has a resonance frequency of 160 kHz and a Q-factor of 100. Its band width is
Bandwidth, B
_{ω }= f_{0}/Q

Where f_{0}= Resonant frequency.

Q = Quality factor.

B_{ω }= 160/100 = 1.6 kHz. - A circuit which has ω
_{0}= 10^{6}rad/sec (ω_{0}= resonant frequency) C = 10 pf and Q = 100, must have a resistance of ___________kΩ.Q= X_{c}/R ⇒ R= 1/ (ω_{0}CQ) = 1 / (10^{6}× 10 × 10^{-12}× 100) = 100 × 10^{3}Ω . - A certain ac circuit has resistance of 10 ohm and impendence of 20 ohm. The phase angle of voltage and current of the circuit is
cosφ = R/Z = 10/20.

φ = cos^{-1}(1/2)= 60°. - The time constant of an RL circuit is 1 second and its inductor is 8 H, the resistance of the coil is _____ ohms.
Time constant of RL circuit = L/R

T = L/R

⇒ 1 = 8/R

⇒ R = 8 ohm. - The period of the function cos π/4(t-1) is
Here 2π/T=π/4 or,T=8 Second.
- Clamping circuits are one which inserts
Clamping circuits / dc restorer are one which inserts dc components. These circuits are used in television amplifiers. A clamping circuit (also known as a clamper) will bind the upper or lower extreme of a waveform to a fixed DC voltage level. Clamp circuits are categorized by their operation; negative or positive, and biased or unbiased.
- To a highly inductive circuit , a small capacitance is added in series . The angle between voltage and electric current will
The angle between voltage and electric current decreases when capacitance is added in series to a highly inductive circuit.
- Value of electric current at resonance in a series RLC circuit is affected by the value of
In series RLC circuit value of electric current is always affected by inductor of the circuit.
- Superposition theorem is not applicable to networks having
Superposition is only applicable to networks having linear elements.
- A network is linear if
A linear network obeys both the principle of superposition and homogeneity.

Design with by SARU TECH