electronics-and-communication-engineering-analog-electronics Related Question Answers

1. An RC coupled amplifier has an open loop gain of 200 and a lower cutoff frequency of 50 Hz. If negative feedback with β = 0.1 is used, the lower cut off frequency will be





2. In figure v1 = 8 V and v2 = 4 V. Which diode will conduct?





3. The load impedance ZL of a CE amplifier has R and L in series. The phase difference between output and input will be





4. If an amplifier with gain of - 1000 and feedback factor β = - 0.1 had a gain change of 20% due to temperature, the change in gain of the feedback amplifier would be





5. In figure The minimum and maximum load currents are





6. In figure, VEB = 0.6 V, β = 99. Then VC and IC are





7. The input impedance of op-amp circuit of figure is





8. In a BJT circuit a pnp transistor is replaced by npn transistor. To analyse the new circuit





9. To protect the diodes in a rectifier and capacitor input filter circuit it is necessary to use





10. The output V0 in figure is





11. In a CE amplifier the input impedance is equal to the ratio of





12. For a system to work, as oscillator the total phase shift of the loop gain must be equal to





13. An amplifier has a large ac input signal. The clipping occurs on both the peaks. The output voltage will be nearly a





14. The transistor of following figure in Si diode with a base current of 40 μA and ICBO = 0, if VBB = 6V, RE = 2 kΩ and β = 90, IBQ = 20 μA then RB =





15. In the amplifier circuit of figure hfe = 100 and hie = 1000 Ω. The voltage gain of amplifier is about





16. The efficiency of a full wave rectifier using centre tapped transformer is twice that in full wave bridge rectifier.



17. Assertion (A): CE amplifier is the most widely used BJT amplifierReason (R): CE amplifier has zero phase difference between input and output





18. Assertion (A): For large signal variations an amplifier circuit has to be analysed graphicallyReason (R): The output characteristics of a transistor is nonlinear.





19. Negative feedback reduces noise originating at the amplifier input.



20. Maximum efficiency of class B power amplifier is 50%.



21. In figure what is the base current if VBE = 0.7 V





22. In figure ID = 4 mA. Then VS =





23. The self bias provides





24. In figure what is value of IC if βdc = 100. Neglect VBE





25. Consider the following statements : A clamper circuit adds or subtracts a dc voltage to a waveformdoes not change the waveformamplifiers the waveform Which are correct?





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