77.
In the circuit shown below Q1 has negligible collector-to-emitter saturation voltage and the diode drops negligible voltage across it under forward bias. If Vcc is +5 V, X and Y are digital signals with 0 V as logic 0 and Vcc as logic 1, the Boolean expression for Z is
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78.
Consider the following digital circuits:
1. Multiplexers
2. Read Only Memories
3. D-latch
4. Circuit as shown
Which of these come under the class of combinational circuits?
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