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Q. Explain Television signal transmission?
Television signals in television signal transmission are the electric signals generated by converting visual images through raster (TV image area) scanning. The two-dimensional image or picture is converted into a one-dimensional electric signal by sequentially scanning the image and producing an electrical signal that is proportional to the brightness level of the image. A television camera, which optically focuses the image on a photo cathode tube that consists of a photosensitive surface, is used for scanning. An electron beam produces an output current or voltage that is proportional to the brightness of the image, known as a video signal. The scanning of the electron beam is controlled by two voltages, as shown in Figure, applied across the horizontal and vertical deflection plates. In the raster scanning in an NTSC TV system, the image is divided into 525 lines which define a frame, as illustrated in Figure. The resulting signal is transmitted in 1/30 second. The number of lines determines the picture resolution and, along with the rate of transmission, sets the channel bandwidth needed for image transmission.
However, the time interval of 1/30 second to transmit a complete image is not generally fast enough to avoid flickering, which is annoying to the average viewer. Therefore, to overcome the flickering, the scanning of the image is performed in an interlaced pattern, as shown in Figure, consisting of two fields, each of 262.5 lines. Each field is transmitted in 1/60 second. The first field begins at point a and terminates at point b, whereas the second field begins at point c and terminates at point d.
Q. Explain the action of a pn-junction with bias. Consider both the forward bias and the reverse bias, and use sketches wherever possible.
Role of StakeHolders in Distribution Reform These challenges could be met only by comprehensive reforms in the distribution sector. Earlier, you have studied about the roles o
Q. Explain crossbar exchange, with all call processing steps and diagrams. Ans: The basic concept of crossbar switching is to provide a matrix of n x m sets of contacts with
Find the current through each resistor for the networking below using Superposition Theorem.
Q. An operational amplifier stage is typically represented by the circuit of Figure. For the values given, determine V out and the power supplied by the 2.5-V source.
General configuration of cellular systems?
There are zillions of things in electronics known as encoders. You can look up LCDs and NAND gates as well and this is actual basics.
You have to look up the data sheets for the LM317 (Not LT317), LT1006. V1 is a standard 9 volt battery, and the resistors are “through hole”. Label the test points in, V+, gnd, and
Q. Consider the circuit shown in Figure. (a) Given v(t) = 10e -t V, find the current source is(t) needed. (b) Given i(t) = 10e -t A, find the voltage source v (t) needed.
Q. A 10-kW, 230-V shunt generator, with an armature-circuit resistance of 0.1 and a field- circuit resistance of 230 , delivers full load at rated voltage and 1000 r/min. If the
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