537 questions and answers
State and prove maximum power transfer theorem
The theorem states that a networks delivers maximum power to a resistive load connected across a voltage source when the load resistance is equal to the internal resistance of the voltage source as seen from the output terminals by removing the source and replacing the same by its internal resistance.
Compare electric and magnetic circuits with respect to their similarity and dissimilarities.
The similarity between electric and magnetic circuit is given in table 1
What is resonance? Deduce the expression of frequency in a series RLC circuit and parallel RLC circuit at resonance.
In general , the resonance means a particular situation in a physical system where a sinusoidal force having a constant amplitude gives rise to an enhanced response of maximum amplitude varying with time.
Explain what are meant by phase and phase difference of sinusoidal waves..
Phase of an alternating quantity at any instant is the time that has elapsed since the instantaneous value of the quantity assumed zero value was going from negative to positive direction.
A coil of resistance 30 Ω and inductance 320 mH is connected in parallel to a consisting of 75 Ω in series with 150 µF capacitor. The circuit is connected to a 200 volt, 50 Hz supply. Determine supply current and circuit power factor.
Inductive reactance \(X_L=j\omega L=j\times2\pi\times f\times L=j\times2\times\frac{22}{7}\times50\times320\times{10}^{-3}\) \(X_L=100.48\ \mathrm{\Omega}\)
Draw a mathematical expression for RMS value of a sinusoidal voltage \(v=V_{m}\sin{{\omega t}}\).
Let us determine the RMS value of a sinusoidally varying current, i(t) flowing through a resistance R. At any instant of time the heat generated of power dissipated in the resistance is \(\left(i(t)\right)^2R\). The average heat produced or power absorbed during a full cycle of period T is given by
A network of resistances is formed as shown in Fig.14. Compute the resistance between the points A and B.
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Fig. 14(a)
The star connection by the resistors \(3\ \mathrm{\Omega}\),\(4\ \mathrm{\Omega}\) and\(6\ \mathrm{\Omega}\) is converted to delta connection, we have by the redraw of Fig. 14
A circuit consists of series combination of elements as resistance of 6 Ω, inductance of 0.4 H and a variable capacitor across 100 V, 50 Hz supply. Calculate
The given data are \(R=6\ \mathrm{\Omega}\), L=0.4H, capacitance is variable. Supply voltage is 100V
What is meant by hysteresis in a magnetic circuit? What is the significance of B-H curve?
The magnetization curve is useful to explain the magnetic properties of a ferromagnetic material like iron, cobalt and nikel. The magnetization curve is also called B-H curve or hysteresis loop which is a plot of internal magnetic flux density against external magnetic field.
Determine the value R in Fig. 15(a) such that 4 Ω resistor consumes maximum power.
1.png)
Fig. 15(a)
\(R_1=\frac{3\times R}{3+R+3}=\frac{3R}{6+R}\) \(R_2=\frac{3\times3}{3+R+3}=\frac{9}{6+R}\)
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