Saturday, 26 April 2014

ECA (Electronic Circuit Analysis) IMPORTANT QUESTIONS For Final Exams

ECA (Electronic Circuit Analysis) IMPORTANT QUESTIONS

SINGLE STAGE AMPLIFIERS

1.Discuss the classifiaction of amp’s on frequency range,type of computing,power delivered and signal handled.

2.using H-parameter model derive…
-volltage gain
-current gain
-i/p resistance
For CE,CC,CB,CS,CD,CG ampr’s.

3.Draw low frequency hybrid model for all configurations (CE,CC,CB,CS,CD,CG)
4.problems on all types of configurations.
5.characteristics of all types of configurations
6.what is square law of distortion and its effect in FET amplifiers?

MULTI STAGE AMPLIFIERS

1.concept on MILLERS TH’M and problems on it
2.Different types of distortions in ampr’s.
3.Analysis of two-stage ampr’s n problems on it.
4.problems on finding higher and lower 3db frequencies
5.Bootstrapped,Darlington,Bootstrapped-darlington,differential circuits.

HIGH FREQUENCY TARNSISTOR CIRCUITS

1.show that diffusion capacitance is proportional to emitter bias current.
2.show that trans conductance is proportional to collector current.
3.Relation b/n fα ,fß, fγ and problems….
4.Hybrid-π model equivalent ckt and derive all the parameters and explain the significanceof each.
5.Using millers thm CE stage with resistive load.
6.Gain Band-width product for voltage and current.

POWER AMPLIFIERS

1.Classification of ampr’s based on the position of quisicent point and workin of class-A,B,AB,D.
2.Show that class-A power amp’r series fed amp’r have an efficiency of about 25% and transformed coupled of about 50%.
3.push-pull and complementary symmetry configurations for class-B powere ampr’s
4.Short notes on Heat-sinks,harmonic distortion,thermal resistance.
5.problems on power dissipation,effciencies….

TUNED AMPLIFIERS-1

1.Methods of classification of Tuned ampr’s and meaning of term Tuned amplifier.
2.Single tuned transistor coupled,capacitive coupled,transformer coupled ampr’s.
4.Effect of casacding single Tuned amp’r on Band-width.
5.problems on the formulae obtained in the analysis.

TUNED AMPLIFIERS-2

1.Stagger Tuned amp’r.
2.Neutralization techniques.
3.class-B,class-c tuned amplifiers and its app’s.

VOLTAGE REGULATORS

1.Block schematic of regulated power supply and the factors affecting the load voltage.
2.Types of voltage regulators,zener shunt,zener series regulators.
3.Transistor series with darlington pair,overload protection,current limiting,Fold-back limiting circuits.
4.Problems depending on the circuits.

SWITCHING AND IC VOLTAGE REGULATORS

1.Detail note on
-IC 723.
-Three terminal regulators (IC 78XX).
-catcher diode.

2.operating ratings and external characteristics of IC 723.
3.Detail note on UPS.
4.Detail note on SMPS.
5.Working of voltage multipliers,types,app’s.