State, with reasons, whether the following statements are True or False

i) In L-C-R circuit, the current and voltage are in same phase only at a single frequency.

ii) Suppressor grid in pentode is kept at anode potential.

iii) Bipolar junction transistor (BJT) is a voltage controlled device.

iv) Reverse basng of a semconductor junction diode increases its energy band gap.

v) Amplifier with common emitter mode offers maximum current gain.

vi) Rectification efficiency is proportional to the number of diodes used in a rectifier circuit.

vii) Slew rate of an op-amp influences its frequency response.

viii) IC 7805 and IC 7905 must always be used together.

ix) Highest Modulus of the ring counter made up of 5 flip-flops is 25.

x) In a CRO the signal input voltage is given to the horizontal deflection plates.

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?

Why are tuned amplifiers preferred at radio frequency? Based on their frequency

response, compare the single and double tuned RF amplifiers.

Explain the working of J-K flip flop. How does it differ from R-S flip flop?

Design and draw a voltage comparator circuit using op-amp IC 741 to give +VSat at the output if the input voltage is less than −3V and −VSat for input more than −3V.

Prove that the LC band pass filter is a constant K type filter

Explain the Barkhausen criterion for sustained oscillation. How is it satisfied in the

phase-shift oscillator circuit?