Physics-
General
Easy

Question

In circuit in following fig. the value of Y is

  1. 0    
  2. 1    
  3. Fluctuates between 0 and 1    
  4. Indeterminate as the circuit can’t be realized    

The correct answer is: 0


    Lower NOT gate inverts input to zero. NOT gate from NAND gate inverts this output to 1 upper NAND gate converts this input 1 and input 0 to 1.
    Thus A = 1 and B = 1 become inputs of NAND gate giving final output as zero. Choice A is correct.

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