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Consider the following statements associated with logic gates:

1. An OR gate in the positive logic system becomes an AND gate in the negative logic system and vice-versa.

2. The dual of an expression is obtained by changing ANDs to ORs, ORs to ANDs.Os to 1s, to Os and by complementing the variables.

3. NAND and NOR are the only two available universal logic gates.

4. Universal gates do not follow commutative law

5. On logic diagrams, an inversion bubble at the point where the input is connected to a gate, indicates an active-HIGH input.

Which of the statements given above is/are not correct?

  • a)
    1 and 3

  • b)
    2 , 4 and 5

  • c)
    1 and 5

  • d)
    5 only

Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Consider the following statements associated with logic gates:1. An OR...


  • An OR gate in the positive logic system becomes an AND gate in the negative logic system and vice-versa.



    • Correct. In positive logic, an OR gate outputs HIGH if any input is HIGH. In negative logic, an OR gate behaves like an AND gate because the inputs are inverted.




  • The dual of an expression is obtained by changing ANDs to ORs, ORs to ANDs, 0s to 1s, 1s to 0s, and by complementing the variables.



    • Incorrect. The dual of a logic expression is obtained by changing ANDs to ORs and ORs to ANDs, and by swapping 0s and 1s, but the variables are not complemented.




  • NAND and NOR are the only two available universal logic gates.



    • Correct. NAND and NOR gates are universal gates because you can construct any other logic gate using just NAND or just NOR gates.




  • Universal gates do not follow commutative law.



  • On logic diagrams, an inversion bubble at the point where the input is connected to a gate, indicates an active-HIGH input.



    • Incorrect. An inversion bubble indicates an active-LOW input, not an active-HIGH input. The bubble shows that the input or output is inverted.





 


Conclusion:


The statements that are not correct are 2, 4, and 5.


Thus, the correct answer is:


2. 2, 4 and 5
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Most Upvoted Answer
Consider the following statements associated with logic gates:1. An OR...
Incorrect Statements in Logic Gates:
1. Statement 2: The dual of an expression is obtained by changing ANDs to ORs, ORs to ANDs, 1s to 0s, and 0s to 1s, and by complementing the variables. This statement is not correct as it incorrectly describes the process of obtaining the dual of an expression. The correct process involves interchanging ANDs with ORs, interchanging 1s with 0s, and keeping the variables as they are without complementing them.
2. Statement 4: Universal gates do not follow the commutative law. This statement is not correct as universal gates, such as NAND and NOR gates, do follow the commutative law. The commutative law states that changing the order of operands in an operation does not change the result. In the case of universal gates, the order of operands does not affect the output of the gate.
3. Statement 5: On logic diagrams, an inversion bubble at the point where the input is connected to a gate indicates an active-HIGH input. This statement is not correct as an inversion bubble, also known as a bubble or bubble on input, indicates an active-LOW input. When the input signal is inverted with a bubble, it means that the input is active when it is low (0) rather than when it is high (1).
Therefore, the correct answer is option B, which includes statements 2, 4, and 5 as incorrect.
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Consider the following statements associated with logic gates:1. An OR gate in the positive logic system becomes an AND gate in the negative logic system and vice-versa.2. The dual of an expression is obtained by changing ANDs to ORs, ORs to ANDs.Os to 1s, to Os and by complementing the variables.3. NAND and NOR are the only two available universal logic gates.4. Universal gates do not follow commutative law5. On logic diagrams, an inversion bubble at the point where the input is connected to a gate, indicates an active-HIGH input.Which of the statements given above is/are not correct?a)1 and 3b)2 , 4 and 5c)1 and 5d)5 onlyCorrect answer is option 'B'. Can you explain this answer?
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Consider the following statements associated with logic gates:1. An OR gate in the positive logic system becomes an AND gate in the negative logic system and vice-versa.2. The dual of an expression is obtained by changing ANDs to ORs, ORs to ANDs.Os to 1s, to Os and by complementing the variables.3. NAND and NOR are the only two available universal logic gates.4. Universal gates do not follow commutative law5. On logic diagrams, an inversion bubble at the point where the input is connected to a gate, indicates an active-HIGH input.Which of the statements given above is/are not correct?a)1 and 3b)2 , 4 and 5c)1 and 5d)5 onlyCorrect answer is option 'B'. Can you explain this answer? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about Consider the following statements associated with logic gates:1. An OR gate in the positive logic system becomes an AND gate in the negative logic system and vice-versa.2. The dual of an expression is obtained by changing ANDs to ORs, ORs to ANDs.Os to 1s, to Os and by complementing the variables.3. NAND and NOR are the only two available universal logic gates.4. Universal gates do not follow commutative law5. On logic diagrams, an inversion bubble at the point where the input is connected to a gate, indicates an active-HIGH input.Which of the statements given above is/are not correct?a)1 and 3b)2 , 4 and 5c)1 and 5d)5 onlyCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider the following statements associated with logic gates:1. An OR gate in the positive logic system becomes an AND gate in the negative logic system and vice-versa.2. The dual of an expression is obtained by changing ANDs to ORs, ORs to ANDs.Os to 1s, to Os and by complementing the variables.3. NAND and NOR are the only two available universal logic gates.4. Universal gates do not follow commutative law5. On logic diagrams, an inversion bubble at the point where the input is connected to a gate, indicates an active-HIGH input.Which of the statements given above is/are not correct?a)1 and 3b)2 , 4 and 5c)1 and 5d)5 onlyCorrect answer is option 'B'. Can you explain this answer?.
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