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Q. How oscillations start up in an oscillator?
The noise voltage produced due to the random motion of electrons in resistors or in active devices provides the starting voltage for an oscillator. The noise voltage contains almost all sinusoidal frequencies and this gets amplified and appears at the output of the amplifier. This amplified output drives the feedback network which is either a resonant circuit or a phase shift network. Because of this feedback voltage the feedback signal is maximum at a particular frequency or the phase shift required for the positive feedback is correct at this frequency. This particular frequency is the frequency of the oscillator. Thus although the noise voltage contains all the frequencies the output of the oscillator will contain a single sinusoidal frequency.
Q. What layers are covered under end to end layer connectivity? Layers 4-7 of ISO-OSI reference model communicate with peer entities in end systems. In intermediate systems,th
Use delta-wye transformation for network reduction and determine the current through the 12- resistor in the circuit of Figure(a).
Diac Diac is a device which has di electrode and as its name suggests it works on AC. The cross sectional view of a diac is shown if the four layers are PNPN and PNPN .
Q. Show Benefits of digital systems? Ever since most digital systems have only two possible states, there is high degree of accuracy in the transmission of data. With an analog
Hysteresis loss least depends on (A) Frequency. (B) Magnetic field intensity. (C) Volume of the material. (D)Grain orientation of material.
Q. Using two 8-to-1multiplexers and one 2-to-1multiplexer, show how a 16-to-1 multiplexer can be obtained in the form of a block diagram.
Q. A 60-Hz, 440-V, three-phase system feeds two balanced wye-connected loads in parallel. One load has a per-phase impedance of 8 + j3 and the other 4 - j1 . Compute the real po
Q. A transformer is rated 10 kVA, 220:110 V (rms). Consider it an ideal transformer. (a) Compute the turns ratio and the winding current ratings. (b) If a 2-load resistance
to design wheatstone bridge
Q. Explain the conditions to be satisfied for sustained oscillations in an oscillator circuit with the help of block diagram. The essential condition for sustained oscillations
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