Basic Electrical Engineering

36 questions and answers

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

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

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added 2 years ago

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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.

Basic Electrical Engineering

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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.

Basic Electrical Engineering

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added 2 years ago

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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 $X_{L} = j ω L = j \times 2 π \times f \times L = j \times 2 \times \frac{22}{7} \times 50 \times 320 \times 10^{- 3}$ $X_{L} = 100.48 Ω$

Basic Electrical Engineering

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added 2 years ago

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

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 ${(i (t))}^{2} R$ . The average heat produced or power absorbed during a full cycle of period T is given by

Basic Electrical Engineering

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added 2 years ago

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

Fig. 14(a)

The star connection by the resistors $3 Ω$ , $4 Ω$ and $6 Ω$ is converted to delta connection, we have by the redraw of Fig. 14

Basic Electrical Engineering

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added 2 years ago

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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

Value of capacitance at resonance

Voltage drop across capacitor

Q- factor of the coil

The given data are $R = 6 Ω$ , L=0.4H, capacitance is variable. Supply voltage is 100V

Basic Electrical Engineering

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added 2 years ago

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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.

Basic Electrical Engineering

An iron ring of mean length 50 cm, has an air – gap of 1 mm and winding of 200 turns. The relative permeability of iron is 300. When 1A current follows through the coil, determine flux density.

Given that The mean length of the iron ring l=50 cm=0.5 m

Basic Electrical Engineering

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added 2 years ago