Discussion Forum



1)

 A person applies a sine wave and square wave to an AND gate as shown in the figure (i) and (ii) . Assuming that both the voltages are applied in phase , the person observers the output  at E and F on (i) and (ii) , respectively. [Assume minimum voltage of 5V is equivalent to logic (i)]

1672021200_c7.PNG


A) Sqaure wave at 50 Hz and square wave at 100 Hz

B) Sine wave at 50 Hz and square wave at 100 Hz

C) No output and sine wave at 100 Hz

D) No output and pulsed wave at 100 Hz

Answer:

Option D

Explanation:

(i) Sine wave , 50 Hz, 2V

 1672021155_d1.PNG

  Square wave  107 Hz,6 V

 (ii)  Sine wave, 100 Hz , 8 V

 1672021685_d2.PNG

  Square wave, 100 Hz, 6 V

 In figure(i)  , sine wave and square wave both have different frequencies, respectively, 50Hz and 107 Hz . Hence , these voltages are not processed by AND gate, therefore, no output  is obtained  from gate (i)  . In figure (ii)  , the sine wave and square wave both have same frequency of 100 Hz  , hence , these voltage are processed by AND gate. Since , logic gate(AND gate) gives output  in two-level ( 0 and 1)  only at same frequency of input. Therefore, the output  of gate (ii) will be the pulsed  wave of 100 Hz