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CONCEPT:
The given truth table matches with the NOR logic gate.
The truth table given below is for
(A and B are the inputs, Y is the output)
CONCEPT:
The given truth table matches with the NAND logic gate.
If the glow of the bulb is considered an output, the correct Boolean operation represented by the circuit diagram drawn will be:
From the given circuit we can see that,
The circuit diagram shown here corresponds to the logic gate
CONCEPT:
CALCULATION:
Let us the different cases.
Case I  When A = 0, B = 0
The LED will glow.
Therefore, Y = 1
Case II  When A = 1, B = 0
The LED will not glow.
Therefore, Y = 0
Case III  When A = 0, B = 1
The LED will not glow.
Therefore, Y = 0
Case IV  When A = 1, B = 1
The LED will glow.
Therefore, Y = 0
The truth table is written as;
Here we see the results it will show the nature of NOR.
Hence, option 3) is the correct answer.
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 ?
Concept:
Logic gates are:
1.AND Gate
2. NAND Gate
3. OR Gate
Calculation:
Output of combination of logic gates is given as
So the output y is high i.e., 1.
Hence, Output voltage is V0 = 5 V.
CONCEPT:
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:
When both the input signals A and B of the NOR & NAND gate are connected together, The output of the resultant circuit will be equivalent to
CONCEPT:
When both the input signals A and B of NOR & NAND gate are connected together, we have one common input connection hence the resultant output will be NOT gated.
As shown when both the inputs are combined in either NAND or NOR gate, they both will behave like a NOT gate
This will be the truth table for both NAND and NOR logic gate when their inputs are connected.
What will be the output of the combination of AND gate and NOT gate if the inputs are A and B?
CONCEPT
Logic gates:
Types of Logic gates:
AND Gate: If both the inputs are high, it produces a high output.
OR gate: If any of the input is high, it produces a high output.
NOT gate: It inverts the input. Whatever the input is given, it changes its value at the output.
Therefore option 3 is correct.
The correct answer is NOR gate.
Concept:
NOT, AND and OR gate realization using NAND gate is as shown:
Identify the logic gate carried out by the following circuit.
CONCEPT:
Combination of Logic Gates
The above combination of the logic gate is the NAND gate.
CONCEPT:
A logic gate has one or more inputs but only one output. Thus, option 2 is correct.
It is an electronic device that implements a Boolean function. Thus option 1 is correct.
A logic gate follows a logical relationship between input and output voltages. Thus option 3 is incorrect.
CONCEPT:
Identify the logic operation carried out by the following circuit.
Concept:
De Morgan’s law states that:
This is OR gate. So option 4 is correct.
CONCEPT:
AND Gate: The Logic AND Gate is a type of digital logic circuit whose output goes 1 (HIGH) only when all of its inputs are 1 (HIGH)
The truth table for AND gate:
CONCEPT:
OR 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 high (1) otherwise it gives a low output (0).
It is described by the Boolean expression: A + B = Y
The above logic gate is the OR gate.
The truth table of OR gate:
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