NIMCET 2022
If a signal passing through a gate is inhibited by sending a low into one of the inputs, and the output is HIGH, the gate is a(n):
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Answer: Option D — NAND
Detailed Solution
A NAND gate gives a HIGH output whenever at least one input is LOW. So once a LOW is applied to one input, the output stays HIGH whatever the signal on the other input does: the signal is inhibited and the output is HIGH.
An AND gate is also inhibited by a LOW, but its output is then LOW. With one input LOW, OR passes the other signal unchanged and NOR passes it inverted, so neither is inhibited.
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Digital Electronics — Preparation
This question tests your understanding of Digital Electronics, a key topic in the Computer Awareness section. The detailed solution above uses a step-by-step approach to show the reasoning, and where available, a shortcut that helps you solve similar questions in under 90 seconds during the actual exam.
Digital electronics is the study of circuits that work with binary signals, and it forms the hardware basis of every computer. This topic covers logic gates (AND, OR, NOT, NAND, NOR, XOR and XNOR) and their truth tables, Boolean algebra and its laws, De Morgan's theorems, and simplifying Boolean expressions, including with Karnaugh maps (K-maps). It also covers combinational circuits such as half adders, full adders, multiplexers, demultiplexers, encoders and decoders, and sequential circuits such as flip-flops (SR, JK, D and T), registers and counters. Exam questions test writing or reading truth tables, simplifying expressions, and identifying the output of a given circuit. Remember that NAND and NOR are universal gates, which means any other gate can be built using only NAND gates or only NOR gates. Practise the digital electronics questions below, each with a step-by-step solution.