13. Look at the schematic diagram shown in the figure. This schematic diagram re

Question

13.   Look at the schematic diagram shown in the figure. This schematic diagram represents a _______ oscillator.      A. relaxation B. twin-T C. phase-shift D. Wein bridge
16.   Look at the block diagram shown. Which of the following multiplication factors must take place in the two unmarked stages to obtain the 60 kHz output?      A. × 6 and × 6 B. × 6 and × 2 C. × 5 and × 5 D. × 3 and × 2

17.   Look at the circuit diagram and the four waveforms that are shown. Which of the four ripple waveforms shown would result if D2 were to open?      A. Waveform 2 B. Waveform 1 C. Waveform 4 D. Waveform 3

Explanation / Answer

15. That RC circuit is used to create the phase shift of 180 degrees(each RC contributes 60 degrees here).Remaining 180 degrees can be accomplished by connecting the op amp in inverting mode to realize the oscillator requirement of 360 degrees. This one is RC phase shift oscillator

16. Block diagram is not provided here.

17. If one diode opens in the full wave rectifier it would not conduct for one half cycle. it acts as half wave rectifier.

so the waveform is the result because negative half cycle of supply is does not conducted (d2 is off)

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