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Q. Explain Continuous-data and discrete-data systems?
A continuous-data system is one in which the signals at various parts of the systemare all functions of the continuous-time variable t.When one refers to an ac control system, it usually means that the signals in the system aremodulated by some kind ofmodulation scheme.On the other hand, a dc control system implies that the signals are unmodulated, but they are still ac signals according to the conventional definition. Typical components of a dc control system are potentiometers, dc amplifiers, dcmotors, and dc tachometers; typical components of an ac control system are synchros, ac amplifiers, ac motors, gyroscopes, and accelerometers.
Q. In an amplifier, the maximum voltage gain is 1500 and occurs at 1kHz. It falls to 1060.5 at 20kHz and at 20Hz. Determine (i) lower cut-off frequency (ii) upper cut-o
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A transistor has (A) One p-n junction. (B) Two p-n junction. (C) Four p-n junction. (D) Five p-n junction. Ans: A transistor has two p-n junctions.
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