Digital Electronics MCQ Questions & Answers

Digital Electronics MCQ Questions & Answers | ECE

Learn Digital Electronics MCQ questions & answers are available for a Electronics and Communications Engineering(ECE) students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Digital Electronics MCQ question is the important chapter for a Electronics and Communications Engineering(ECE) and GATE students. Page-2 section-2

A 4-line-to-1-line multiplexer shown in figure-I (the same as per IEEE convention is shown in figure-II) is fed with three logic inputs A, B and C as shown. The output of the multiplexer will be
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A) ∑m(0, 1, 2, 4) B) ∑m(0, 3, 5, 7) C) ∑m(3, 5, 6, 7) D) ∑m(1, 2, 5, 6)

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Answer: Option C

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The number FF in hexadecimal system has equivalence in decimal system to

A) 245 B) 255 C) 265 D) 275

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Answer: Option B

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Negative NOR (a NOR in the negative positive logic system) becomes a Positive

A) NAND B) NOR C) OR D) None of these

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Answer: Option A

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Which of the following counter can be used to divide the clock frequency of a microprocessor by 5?

A) 3 bit counter B) 5 bit counter C) mod 3 counter D) mod 5 counter

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Answer: Option D

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The Boolean equation $${\text{X}} = \left[ {\left( {{\text{A}} + \overline {\text{B}} } \right)\left( {{\text{B}} + {\text{C}}} \right)} \right]{\text{B}}$$ can be simplified to

A) $${\text{X}} = \overline {\text{A}} {\text{B}}$$ B) $${\text{X}} = {\text{A}}\overline {\text{B}} $$ C) $${\text{X}} = {\text{AB}}$$ D) $${\text{X}} = \overline {\text{A}} \overline {\text{B}} $$

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Answer: Option C

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The output equivalent circuit of following circuit is
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A) INVERTER B) AND C) OR D) NOR

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Answer: Option C

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The Boolean functions can be expressed in canonical SOP (sum of products) and POS (Product of sums) form. For the function, $${\text{Y}} = {\text{A}} + \overline {\text{B}} {\text{C,}}$$ which are such two forms

A) Y = Σ(1, 2, 6, 7) and Y = Π(0, 2, 4) B) Y = Σ(1, 4, 5, 6, 7) and Y = Π(0, 2, 3) C) Y = Σ(1, 2, 5, 6, 7) and Y = Π(0, 2, 3) D) Y = Σ(1, 2, 4, 5, 6, 7) and Y = Π(0, 2, 3)

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Answer: Option B

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The sum (S) of A and B in a half Adder can be implemented by using K NAND gates. The value of K is

A) 3 B) 4 C) 5 D) None of these

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Answer: Option B

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A mealy state machine's output depends on

A) State and outputs B) Inputs C) State D) State and inputs

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Answer: Option D

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The outputs Q and $$\overline {\text{Q}} $$ of master slave S-R flip-flop are connected to its R and S inputs respectively. The output Q when clock pulses are applied will be

A) Permanently 0 B) Permanently 1 C) Fixed 0 or 1 D) Complementing with every clock pulse

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Answer: Option D

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