Unit of inductance is ________.
The unit of inductance is Henry. Weber is the unit of magnetic flux. Tesla is the unit of flux density. Farad is the unit of capacitance.
Which of the following is not the energy stored in a capacitor?
Energy stored in a capacitor, E = CV^{2}/2
Using C = Q/V
E = CV^{2}/2 = QV/2 = Q^{2}/2C
Two AC sources feed a common variable resistive load as shown in figure below.
The maximum power that can be transferred to a variable load R_{L} is _______ W.
The switch of below circuit was open for long and at t = 0 it is closed. What is the final steady state voltage across the capacitor and the time constant of the circuit?
Final value = 20/2 = 10 Volt
Time constant τ= 5 × 10^{3} × 20 × 10^{6}
= 0.1 sec
The y parameter of the network given in figure is:
The power consumed by a coil is 300 W when connected to 30 V dc source and 108 W. When connected to a 30 V A.C. source. The reactance of the coil is:
For a transmission line open circuit and short circuit impedances are 20 Ω and 5 Ω. Then characteristic impedance is:
A human nerve cell has an open circuit voltage of 80 mV and it can deliver a current of 5 nA through a 6 MΩ load. What is the maximum power available from the cell?
The Thevenin impedance across the terminal AB of the given network is:
The circuit shown in the figure R_{g }is variable between 3 and 30 ohms R_{L} being fixed.
Assertion (A): For Maximum power transfer across the terminals AB, R_{g} = 3?
Reason (R): When Maximum power transfer occurs R_{L} = Z_{g}
A line to neutral voltage is 10∠15^{0}V for a balanced three phase star connected load with phase sequence ABC. The voltage of line B with respect to line C is given by:
= 10 ∠15^{0} Volt
Phase sequence is ABC
Line Voltage
= 10[1∠  120^{0} x 1∠15  1∠120^{0} x 1∠15]
Determine Maximum power consumed in the load resistance R_{L }_____ (in watts)
(Important  Enter only the numerical value in the answer)
ω = 2πf = 2π x 50 = 100π
X_{L} = ωL , X_{c} = 1/ω_{c}
Thevenin equivalent across R_{L}
P_{Max} = ± 2R_{L} = (0.026)^{2} x 132.07
P_{Max} = 8.92 Watt
A series RLC circuit resonates at 4Hz it provides 0.707 lag P.F. at 8 Hz. The frequency at which it gives 0.707 lead P.F is?
f_{0} = 4 Hz,
Upper cut off frequency
f_{2} = 8Hz
lower cutoff f_{1} = ?
(4)^{2} = f_{1} x 8
16 = f_{1} x 8
f_{1} = 2Hz
In series RLC circuit, the voltage across capacitor and inductor are ______ with each other.
In series RLC circuit, the voltage across capacitor and inductor are 180⁰ out of phase with each other. The frequency at which the resonance occurs is called resonant frequency.
A series RLC circuit has a resonance frequency of 1kHz and a quality factor Q = 100. If each of R, L and C is doubled from its original value then new Q of the circuit is:
Quality factor:
if R, L, C double:
R' = 2R, L' = 2L, C' = 2C
A 25 Ω resistor has a voltage of 150 sin377 t. Find the corresponding power.
Consider the following function:
1.
2.
3.
4.
Which of the above function are LC driving point impedances?
Only (1) and (2) are LC driving point impedance.
If an RC driving point impedance function Z(S) has an equal number of poles and zero’s at finite locations then:
Let us Consider:
For the circuit shown below the pole’s of the driving point impedance function are at which one of the following location?
A Pole at S = 1 and a zero at S =  1/2.
The voltage and current wave functions for an element are shown in the figures.
The circuit element and its value are:
For L = 2H
So element is inductor and its value is 2H
The steady state in the circuit shown in the given figure is reached with S open. S is closed at t = 0. The current I at t = 0^{+} is:
KCL and node V_{x}
The total impedance Z(Jω) of the circuit shown below is:
Identify which of the following is not a tree of the graph shown in figure.
Tree
Two lamps each of 230V and 60W rating are connected in series across a single phase 230V supply. The total power consumed by the two lamps would be:
Resistance of each lamp
Hence Total resistance offered by 2 these lamps
So total power consumed by two lamps
For the RL circuit shown the current i(t) for unit step input voltage will rise to 0.63 is:
The time at which the current rise to 63% of its final value is Time constant,
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