537 questions and answers
Establish the equivalence between Thevenin’s and Norton’s theorems.
An ideal voltage source can be thought of being a Thevenin equivalent circuit of itself for the special case where series resistance is zero.
Find the value of load resistance RL for which the power source will supply maximum power. Also find the value of the maximum power for the network as shown in Fig. 21.
Fig. 21
According to the Maximum power transform theorem maximum power is delivered by the load resistance RL when internal resistance of the circuit is equal to the load resistance.
Find VAB from the circuit if all the resistances are of same value of 1 Ω.
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Fig. 20(a)
The resistance P and Q are in Series, the equivalent resistance R1=1+1=2Ω The resistance R1 and R are in parallel. The equivalent resistance R2=(2×1)/()=2/3 Ω
Derive an expression for lifting power of a magnet
Consider two poles arranged directly opposite each other as shown in Fig. 29. Let each have an area A square meters and F Newtons be the force of alteration between them.
A Wheatstone bridge consists of AB = 4 Ω, BC = 3 Ω, CD = 6 Ω and DA = 5 Ω, A 2.4 V battery is connected between points B and D. A galvanometer of 8 Ω resistances is connected between A and C. Using Thevenin’s theorems find the current through the galvanometer.
Total resistance of parallel pair \(\frac{9 \times 9}{ 9 + 9}=4.5\ \mathrm{\Omega}\) Source current is \(\frac{2.4}{4.5}=0.53\ Amp\)
What is strip line?
Strip lines are essentially modifications of the two wire lines and coaxial line. These are basically planar transmission lines that are widely used at frequency from 100 MHz to 100 GHz.
What is microstrip line? What are the advantages and disadvantages of microstrip line? Show the electric and magnetic field lines of microstrip line explain the working principle of a microstrip antenna.
Microstrip line is an unsymmetrical strip line that is nothing but a parallel plate transmission line having dielectric substrate, the one face of which is metalized ground and the other face has a thin conducting strip of certain with 'w' and thickness 't'.
Define the quality factor. On what factors does the cut-off frequency of a rectangular waveguide depend? Derive expressions in support of your answer.
The quality factor (Q) of any resonant or anti resonant circuit is a measure of frequency selectivity and it defined by the equation
How is a Phase Locked Loop (PLL) used for demodulation of FM signal? Mention the advantage of PLL demodulation.
The PLL is useful in demodulation of FM signals in presence of large noise and low signal power (low signal to noise ratio). It is most switched for using space vehicle to earth data links or where loss along the transmission path is very large recently it has found application is commercial FM receivers.
Explain with suitable block diagram the generation of FM signal using Armstrong method.
The generation of FM waveform by indirect method is also known as Armstrong Method. In the indirect method a narrow band FM signal is generated first after that this NBFM signal is frequency multiplied to generate WBFM.
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