Combinational Logic Analysis Questions with Answers

Combinational Logic Analysis is an important concept in digital electronics that involves understanding how output states depend on input combinations. This topic includes logical reasoning questions and answers based on logic gates, truth tables, Boolean algebra, and circuit simplification. Practicing these problems improves your analytical thinking and helps in exams like GATE, PSU, and ISRO. The provided questions come with detailed explanations to help you grasp the fundamentals of logic design and circuit behavior. These exercises are ideal for those aiming to clear competitive exams or technical interviews in electronics-based roles.

Study circuit logic combinations and analysis. Pair this with digital electronics combinational logic circuits and electronics MCQ

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The output of an exclusive-NOR gate is 1. Which input combination is correct?

A A = 1, B = 0
B A = 0, B = 1
C A = 0, B = 0
D none of the above

Answer: Option C

Before an SOP implementation, the expression would require a total of how many gates?

Answer: Option D

One positive pulse with tw = 75 µs is applied to one of the inputs of an exclusive-OR circuit. A second positive pulse with tw = 15 µs is applied to the other input beginning 20 µs after the leading edge of the first pulse. Which statement describes the output in relation to the inputs?

A The exclusive-OR output is a 20 s pulse followed by a 40 s pulse, with a separation of 15 s between the pulses.
B The exclusive-OR output is a 20 s pulse followed by a 15 s pulse, with a separation of 40 s between the pulses.
C The exclusive-OR output is a 15 s pulse followed by a 40 s pulse.
D *The exclusive-OR output is a 20 s pulse followed by a 15 s pulse, followed by a 40 s pulse.

Answer: Option D

How many NOT gates are required to implement the Boolean expression, ?

Answer: Option B

The inverter can be produced with how many NAND gates?cv

Answer: Option A

A 4-variable AND-OR circuit produces a 0 at its Y output. Which combination of inputs is correct?

A A = 0, B = 0, C = 1, D = 1
B A = 1, B = 1, C = 0, D = 0
C A = 1, B = 1, C = 1, D = 1
D A = 1, B = 0, C = 1, D = 0

Answer: Option D

A 4-variable AND-OR circuit produces a 1 at its Y output. Which combination of inputs is correct?

A A = 0, B = 0, C = 0, D = 0
B A = 0, B = 1, C = 1, D = 0
C A = 1, B = 1, C = 0, D = 0
D A = 1, B = 0, C = 0, D = 0

Answer: Option C

How many 2-input NOR gates does it take to produce a 2-input NAND gate?

Answer: Option D

The output of a NAND gate is LOW when all inputs are HIGH at the same time

A TRUE
B FALSE

Answer: Option A

Q10

When the output of an AND-OR circuit is complemented, it results in an AND-OR-Invert circuit.

A TRUE
B FALSE

Answer: Option A

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Combinational Logic Analysis Questions and Answers

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Combinational Logic Analysis Questions and Answers

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Digital Electronics

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