5 Lecture

CS302

Midterm & Final Term Short Notes

LOGIC GATES

Logic gates are basic building blocks of digital circuits that perform logical operations on one or more binary inputs to produce a single binary output. There are several types of logic gates, including AND, OR, NOT, NAND, NOR, and XOR gates. T


Important Mcq's
Midterm & Finalterm Prepration
Past papers included

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  1. Which logic gate has only one input and one output? A) NOT gate B) AND gate C) OR gate D) XOR gate Answer: A) NOT gate

  2. Which of the following is the symbol for an AND gate? A) B) C) D) Answer: B)

  3. Which of the following logic gates is equivalent to an inverted OR gate? A) NAND gate B) NOR gate C) XOR gate D) XNOR gate Answer: B) NOR gate

  4. Which of the following logic gates has an output that is high only if both inputs are high? A) OR gate B) AND gate C) NOT gate D) XOR gate Answer: B) AND gate

  5. What is the output of an OR gate if both inputs are low? A) High B) Low C) Indeterminate D) Cannot be determined Answer: B) Low

  6. Which logic gate has an output that is low only if both inputs are high? A) OR gate B) AND gate C) NOT gate D) XOR gate Answer: A) OR gate

  7. Which of the following logic gates has an output that is high only if one of the inputs is high? A) OR gate B) AND gate C) NOT gate D) XOR gate Answer: A) OR gate

  8. What is the output of an XOR gate if both inputs are high? A) High B) Low C) Indeterminate D) Cannot be determined Answer: B) Low

  9. Which of the following is the symbol for a NAND gate? A) B) C) D) Answer: D)

  10. Which of the following is the symbol for an XNOR gate? A) B) C) D) Answer: C)

I hope these help!



Subjective Short Notes
Midterm & Finalterm Prepration
Past papers included

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  1. What is the basic function of a NOT gate? Answer: The basic function of a NOT gate is to invert the input signal. It has only one input and one output.

  2. What is the basic function of an AND gate? Answer: The basic function of an AND gate is to produce a high output signal only if all its input signals are high. It has two or more inputs and one output.

  3. What is the basic function of an OR gate? Answer: The basic function of an OR gate is to produce a high output signal if any of its input signals are high. It has two or more inputs and one output.

  4. What is the basic function of a NAND gate? Answer: The basic function of a NAND gate is to produce a low output signal if all its input signals are high. It is the combination of an AND gate followed by a NOT gate.

  5. What is the basic function of a NOR gate? Answer: The basic function of a NOR gate is to produce a high output signal if all its input signals are low. It is the combination of an OR gate followed by a NOT gate.

  6. What is the basic function of an XOR gate? Answer: The basic function of an XOR gate is to produce a high output signal if the number of high input signals is odd. It has two inputs and one output.

  7. What is a truth table? Answer: A truth table is a table that shows the output of a logic gate or circuit for all possible input combinations.

  8. What is a logic gate circuit? Answer: A logic gate circuit is a combination of logic gates that perform a specific logical operation. These circuits are used to implement complex digital systems.

  9. What is the difference between a combinational logic circuit and a sequential logic circuit? Answer: A combinational logic circuit's output is determined solely by the input signals, while a sequential logic circuit's output is determined by both the input signals and the current state of the circuit.

  10. What is a half adder? Answer: A half adder is a combinational logic circuit that adds two binary digits and produces a sum and a carry output.

Logic gates are the building blocks of digital electronics. They are electronic circuits that operate on one or more input signals to produce an output signal based on a specific logical function. There are six basic types of logic gates: NOT, AND, OR, NAND, NOR, and XOR gates. Each gate performs a specific logical operation, and they can be combined to create more complex digital circuits. A NOT gate has only one input and one output. Its output is the opposite of its input signal. An AND gate has two or more inputs and one output. Its output is high only if all of its inputs are high. An OR gate also has two or more inputs and one output. Its output is high if any of its inputs are high. A NAND gate is a combination of an AND gate followed by a NOT gate. Its output is low only if all of its inputs are high. A NOR gate is a combination of an OR gate followed by a NOT gate. Its output is high only if all of its inputs are low. An XOR gate has two inputs and one output. Its output is high if the number of high input signals is odd. Logic gates are used to implement digital circuits, which are the basis of all modern digital electronics. They can be combined to create more complex circuits, such as multiplexers, decoders, and flip-flops. These circuits are used in a variety of applications, including computers, communication systems, and control systems. In summary, logic gates are essential building blocks of digital electronics that perform specific logical functions. They can be combined to create more complex circuits, which are used in a wide range of applications. Understanding logic gates is crucial for anyone working in the field of digital electronics.