Operational Amplifiers and Applications (INDSC3B) — DU B.Sc. (Hons) Instrumentation Previous Year Question Papers

Name of the Cou-rse : Operational Amplifiers and Applications` (b`) What is the difference between a basic comparator and schmitt trigger circuit? -(c) What is a zero-crossing detector? Draw its circuit diagram .(e) The output of an opamp circuit changes by 20 V in 10 seconds. Calculate slew rate. (3) Q.2 (a) (b) (c) Derive the expression for voltage gain and differential input resistance of dual input bat ance output differential amplifier. What is level translator? Draw and explain any one circuit which is used as level translator. Write the differences between Ideal and practical op-Amp. (8) (4) Q.3 (a) (b) (c) What is' Instrumentation amplifier? Draw its circuit and obtain the expression for output voltage. Draw circuit diagram, input and output waveforms for lntegrator. Also obtain expression for output voltage. Explain working of logarithmic amplifier with a diagram. (8) (4) Q.4 (a) Design a s.econd orderhigh pass filterwith a cut off frequency of3 kHz. Also (6) draw it's circuit and frequency response. (b) W`hat is a band reject Filter? Explain working of notch filter. with suitable (6) (c) Explain wor`king of sample and Hold circuit. (6) Q.5 (a) Explain inverting and non- inverting comparator. Draw the input-output (6) (b) (c) Derive the expression for frequency of oscillation for a wein bridge oscillator. What is 555 timer? How it can be used as monostable multivibrator. (6) (6) Q.6 (a) De.sign a summing amplifier using inyerting configuration of op-amp having (6) inputs V1 = 7V, V2 = - 6V and V3 = 2V. (c) Draw equivalent circuit of op-amp. Plot the ideal voltage transfer curve ofop- (6) What is an all pass filter? Draw its circuit diagram and stat6 its applications? (6) Q.7 (a) (b) (c) Draw the circuit diagram along with.input and output waveform of a sawtooth generator. What is Quality factor for Active Filter? What is the value of Quality factor for Wide band pass filter and narrow band pass Filter? Determine the output voltage of the following circuit ilfa 8. 2fas2