# NEET Physics Semiconductor Electronics Questions Solved

BOARD

(a) Draw the circuit diagram of a full wave rectifier using p-n junction diode. Explain its working and show the output, input waveforms.

(b) Show the output waveforms (Y) for the following inputs A and B of

(i)   OR gate   (ii)  NAND gate                                                                 5mark

1mark

During first half cycle:

A is positive w.r.t centre tap but B is negative, hence only diode Dconducts and current flows through the load in the sense X to Y.                                                                       1/2mark

During the second half cycle:

B is positive w.r.t centre tap but A is negative hence only diode Dconducts and again send currents through load from X and Y.                                                                                 1/2mark

$\therefore$Current through the load, in both the halves of input, is unidirectional.

(b)

Difficulty Level:

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