Virtual Labs

Design of Multiplexer using SPICE Code

What is the purpose of a 2:1 multiplexer?

a: To combine two inputs into a single output. Explanation

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b: To select one of two inputs based on a control signal. Explanation

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c: To perform logical AND operation on two inputs. Explanation

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d: To perform logical OR operation on two inputs. Explanation

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Which type of transistors are commonly used in pass-transistor logic circuits?

a: NPN transistors Explanation

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b: PNP transistors Explanation

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c: Both NPN and PNP transistors Explanation

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d: MOSFET transistors Explanation

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What is the function of pass transistors in a 2:1 multiplexer?

a: To control the data flow between inputs and output. Explanation

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b: To amplify the input signals. Explanation

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c: To generate clock signals. Explanation

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d: To perform arithmetic operations. Explanation

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In a 2:1 multiplexer, how many control lines are required to select between two inputs?

a: 1 Explanation

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b: 2 Explanation

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c: 3 Explanation

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d: 4 Explanation

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What is the output of a 2:1 multiplexer when the control line is set to 0?

a: Output is the first input. Explanation

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b: Output is the second input. Explanation

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c: Output is the logical AND of the inputs. Explanation

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d: Output is the logical OR of the inputs. Explanation

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What is the advantage of using pass-transistor logic in digital circuits?

a: Lower power consumption. Explanation

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b: Higher speed of operation. Explanation

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c: Greater noise immunity. Explanation

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d: Simpler design. Explanation

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What happens in a 2:1 multiplexer when the control line is set to 1?

a: Output is the first input. Explanation

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b: Output is the second input. Explanation

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c: Output is the logical AND of the inputs. Explanation

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d: Output is the logical OR of the inputs. Explanation

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What is the primary disadvantage of pass-transistor logic circuits?

a: Higher power consumption. Explanation

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b: Limited fan-out. Explanation

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c: Slower speed of operation. Explanation

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d: Greater complexity. Explanation

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Which of the following is a practical application of a multiplexer in digital systems?

a: Data routing in communication systems Explanation

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b: Generating clock signals Explanation

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c: Performing analog-to-digital conversion Explanation

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d: Amplifying weak signals Explanation

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How are multiplexers used in memory addressing?

a: To select memory cells for read/write operations Explanation

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b: To increase memory size Explanation

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c: To perform error correction Explanation

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d: To generate refresh cycles Explanation

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In what way do multiplexers contribute to the design of arithmetic logic units (ALUs)?

a: By selecting between different arithmetic and logic operations Explanation

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b: By storing intermediate results Explanation

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c: By generating control signals Explanation

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d: By performing multiplication Explanation

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