Electrical Engineering

All Q&A

A network of resistances is formed as shown in Fig.14. Compute the resistance between the points A and B.

Fig. 14(a)

21 June, 2022

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

Draw a mathematical expression for RMS value of a sinusoidal voltage \(v=V_{m}\sin{{\omega t}}\).

21 June, 2022

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 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.

21 June, 2022

Inductive reactance \(X_L=j\omega L=j\times2\pi\times f\times L=j\times2\times\frac{22}{7}\times50\times320\times{10}^{-3}\) \(X_L=100.48\ \mathrm{\Omega}\)

Explain what are meant by phase and phase difference of sinusoidal waves..

21 June, 2022

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.

Compare electric and magnetic circuits with respect to their similarity and dissimilarities.

21 June, 2022

The similarity between electric and magnetic circuit is given in table 1

State and prove maximum power transfer theorem

21 June, 2022

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.

Derive the relationship between modulation index and modulated signal amplitude for sinusoidally modulated DSB-TC signal

21 June, 2022

Let the modulated AM signal \(s\left(t\right)=\left[A_c+A_mx\left(t\right)\right]cos2\pi f_ct\) ……………..... (1) \({s\left(t\right)=A}_c\left[1+\frac{A_m}{A_c}x\left(t\right)\right]cos2\pi f_ct\)

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