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Topic: Logic gates (OR, AND, NOT, NAND, NOR)· Electronic Devices

For the given circuit, the input digital signals are applied at the terminals A, B and C. What would be the output at the terminal y ?

For the given circuit, the input digital signals are applied at the terminals A, B and C. What would be the output at the terminal y ?

input waveforms A, B, C; logic circuit with AND, NAND, OR gates; four output waveform options

1. Output waveform (1): y stays at 0 V throughout t1 to t6 (only spikes at t1..t6 marks)

2. Output waveform (2): 5 V between t1 and t3, 0 V between t3 and t5, 5 V after t5

3. Output waveform (3): constant 5 V

4. Output waveform (4): 0 V between t1 and t3, 5 V between t3 and t5, 0 V after t5

1 answer

Best answer

Answer: 3. Output waveform (3): constant 5 V

Key idea: from the circuit, \(y=A\cdot B+\overline{B\cdot C}\) (AND of A,B ORed with NAND of B,C).

IntervalABCA.BNAND(B,C)y
before t1001011
t1-t2101011
t2-t3010011
t3-t4110111
after t40 or 101011

The output stays at 5 V always: waveform (3).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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