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Electric Circuits
Which parameters of an op-amp become significant for a fast varying ultra low input voltage signal? What should be the values of these parameters for a triangular wave
signal of ±5 mV peak to peak with 50 MHz frequency given to a unity gain op-amp amplifier?
signal of ±5 mV peak to peak with 50 MHz frequency given to a unity gain op-amp amplifier?
Electric Circuits
Design a zener regulated power supply to give 9.1V DC output with maximum load current of 50 mA. Assume that the minimum Iz required for proper functioning of zener diode is 5 mA, and the unregulated DC input is 12V. Indicate the value of Rs and power ratings of zener diode and Rs.
Electric Circuits
Explain the Barkhausen criterion for sustained oscillation. How is it satisfied in the
phase-shift oscillator circuit?
phase-shift oscillator circuit?
Electric Circuits
Why are tuned amplifiers preferred at radio frequency? Based on their frequency
response, compare the single and double tuned RF amplifiers.
response, compare the single and double tuned RF amplifiers.
Electric Circuits
On the basis of their biasing, with the help of appropriate diagrams, justify the uses
of Class A, AB and C amplifiers for various applications.
of Class A, AB and C amplifiers for various applications.
Electric Circuits
State the biasing conditions for E-B and C-B junctions in a BJT for its proper
operation. Explain the output characteristics of a CE configuration of an amplifier.
operation. Explain the output characteristics of a CE configuration of an amplifier.
Electric Circuits
Prove that the LC band pass filter is a constant K type filter.
Electric Circuits
A uniform plane wave of 100 kHz travelling in free space strikes a large block of a material having ε = 4ε0 , µ = 9µ0 and σ = 0 normal to the surface. If the incident magnetic field vector is given by
B = 10^-6 cos(ωt −βy) z^ tesla
write the complete expressions for the incident, reflected, and transmitted field
vectors.
B = 10^-6 cos(ωt −βy) z^ tesla
write the complete expressions for the incident, reflected, and transmitted field
vectors.
Electric Circuits
Explain the different between the monochrome and colour television receivers with
the help of appropriate block diagram.
the help of appropriate block diagram.
Electric Circuits
two coils p and q lie in the same plane and are concentric, coil p has 10T of r=5.0cm and carries a current of 1.0A point q has 20T of r 8.0cm and the current in it is adjusted in the magnitude and direction so that the resultant field at the common center is zero.Draw the diagram to show the relative directions of the two coils and find the magnitude of the coil q
