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Q. For a pyramidal-horn antenna, the maximum directive gain is given by
occurring when the aperture dimensions are A ∼ = √3λLandB = 0.81A. The principal-plane beam- widths for the optimum horn with maximum gain are given by θB ∼ = 54λ/B in degrees in the yz- plane, and by φB ∼ = 78λ/A in degrees in the xz- plane. For a pyramidal horn, with A = 6λ and B = 4.86λ, at 6 GHz, ?nd GD, θB, and φB. Comment on whether this horn is optimum.
Q. Consider a conducting loop of length l and width w, as shown in Figure, rotated about its axis (shown by the broken line) at a speed of ωm rad/s under the influence of a magneti
1. Work out the voltage for the following arrangement of 1.5V cells : (to achieve a pass grade, solve problems with cells in series, parallel and series-parallel) 2.
Q. Explain braking mode of rotating machines? The braking mode has both mechanical and electric energy input. The total input is dissipated as heat. The machine is driven by th
how to derive its transfer function
a) What is meant by frequency response and how would you check the performance of your amplifier? b) Calculate the Voltage Gain of your amplifier at a range of frequencies suffic
Q. Derive the expression for generated emf in a dc generator. Ans. Expression for Generated emf in a DC Generator We shall now derive an expre
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What is ohmmeter An ohmmeter is an instrument for measuring resistance
Q. Three dc generators are operating in parallel with excitations such that their external characteristics are almost straight lines over the working range with the following pairs
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