Test: Logic Gates - Electronics and Communication Engineering (ECE) MCQ

• AND, OR, NOT gates are the basic gates.
• The logic gates which are derived from the basic gates like AND, OR, NOT gates are known as derived gates. NAND, NOR, XOR, and XNOR are the derived gates.
• A universal gate is a gate which can implement any Boolean function without need to use any other gate type. The NAND and NOR gates are universal gates.

CONCEPT:

• Logic gate: The digital circuit that can be analysed with the help of Boolean algebra is called a logic gate or logic circuit.
• A logic gate has two or more inputs but only one output.

EXPLANATION:

• NOR gate: It is a digital circuit having two or more inputs but only one output.
• It gives a high output if either input A or B or both are low (0) otherwise it gives a high output (1).
• It is described by the Boolean expression: 
• The above logic gate is the NOR gate.

Truth table for NOR gate:

Important Point

A NAND gate is a combination of NOT and AND gates, so it will convert two low inputs to high inputs first and then give an AND based output for the modified inputs. 

The one’s complement means that one has to swap all the 0’s and 1’s. So for the given number, swapping 0’s and 1’s would give the number designated as option b as the answer. 

X-OR and X-NOR are termed as arithmetic gates because these gates are so connected that they carry out an arithmetic action and the output they give are the digits of the result. 

Different types of basic logic gates that are there include AND, OR, NOT. using these gates and making different combinations out of them, various other gates like NAND, NOR, etc are created but there is no such gate by the name of IF.  

The logic gates operate on one or more input signals to produce a standard output.
Logic gates give the output in the form of 0 and 1.
The Boolean algebra can be applied to the logic gates.

An OR gate gives the result as 1 if any one of the inputs is one.
Its expression is A+B.
An OR gate gives a 0 only if both the inputs are 0.

When the input to an inverter is LOW (0), the output will be HIGH (1). Therefore, the correct answer is (c) HIGH or 1.

An inverter is a digital logic gate that performs the logical operation of negation. It takes an input signal and produces an output signal that is the logical complement of the input signal. In other words, if the input is 0, the output will be 1, and if the input is 1, the output will be 0.

An inverter performs an operation known as inversion. Therefore, the correct answer is (c) inversion.

An inverter is a digital logic gate that takes an input signal and produces an output signal that is the logical complement of the input signal. The output of an inverter is the opposite of its input. This operation is commonly referred to as inversion. The term "complementation" can also be used to describe this operation. However, assertion refers to the process of setting a signal to a specific logical level, typically high or low, rather than the process of inverting a signal. Therefore, option (b) is not correct. Option (d) is partially correct but (c) is the more specific answer.