STUPIDSID
1(a)
Justify that JFET can be used as a Voltage Variable Resistor
5 M
1(b)
With neat diagram explain any one application of Zero-Crossing Detector
5 M
1(c)
With neat block diagram explain how PLL can be used to generate large number of frequencies from a single reference frequency.
5 M
1(d)
Explain with suitable example what do you understand by signal multiplexing?
5 M
2(a)
Derive an expression for trans-conductance for JFET.
10 M
2(b)
List down various parameters of Opamp along with their typical values for IC741. Also explain what the significance of CMRR and Slew Rate is?
10 M
3(a)
Explain how operational amplifier can be used for taking average of three signals.
5 M
3(b)
Explain fly wheel effect in Class C amplifier.
5 M
3(c)
Explain Nyquist criteria.
5 M
3(d)
Determine the magnitude of gm for a JFET with IDSS=8 mA and Vp=-4 V at dc bias points VGS=-0.5 V and also at VGS=-2.5 V.
5 M
4(a)
Explain generation of SSB using phase shift method.
10 M
4(b)
Explain the use of PLL as FM detector.
10 M
5(a)
Explain super heterodyne receiver in detail along with the waveforms at each stage.
10 M
5(b)
Explain the concept of amplitude modulation.
10 M
6(a)
Write short note on generation of FM by Armstrong method.
5 M
6(b)
Mention important specifications of ADC and DAC required for communication.
5 M
6(c)
Explain the necessity and significance of modulation in communication.
5 M
6(d)
Compare n-channel and p-channel JFET with respect to their device features and voltage current characteristics.
5 M
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