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-7 section-1

The 2's complement representation of (-541)₁₀ decimal in hexadecimal is:

A) DEE B) DDD C) DEF D) DE3

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Answer: Option D

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The number of flip-flop required to construct an 8-bit shift register will be

A) 32 B) 16 C) 8 D) 4

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Answer: Option C

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Which of the following gates is also called 'all or nothing gate'?

A) AND B) OR C) NOR D) XOR

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Answer: Option A

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In TTL family, the Totem-pole circuit on the output is used to provide . . . . . . . .

A) Active pull up and active pull down B) Inactive output state C) Active pull down D) Active pull up

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Answer: Option A

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The expression X + $$\overline {\text{X}} $$ ⋅ Y is equal to

A) 1 B) 0 C) X + Y D) 1 + Y

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Answer: Option C

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The maximum positive and negative numbers which can be represented in 2's complement form using n-bit are

A) +(2^{n - 1} - 1), -(2^{n - 1} - 1) B) +(2^{n - 1} - 1), -2^{n - 1} C) +2^{n - 1}, -2^{n - 1} D) None

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Answer: Option B

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The resolution of an-n-bit D/A converter with a maximum input of 5 V is 5 mV. The value of 'n' is

A) 8 B) 9 C) 10 D) 11

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Answer: Option C

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In a decoder, if the input lines are 4 then number of maximum output lines will be:

A) 2 B) 16 C) 8 D) 4

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Answer: Option B

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The disadvantage of an open shift register is that

A) Both shift left and shift right operations can not be performed B) The quantity stored is lost at every shift pulses C) The register is reset when read-out is over D) All of these

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Answer: Option A

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What is the minimized logic expression corresponding to the given Karnaugh Map?
Digital Electronics mcq question image

A) $${\text{xy}}$$ B) $$\overline {\text{w}} {\text{x}}\overline {\text{y}} + \overline {\text{w}} {\text{yz}} + {\text{w}}\overline {\text{y}} {\text{z}} + {\text{wxy}}$$ C) $$\overline {\text{w}} {\text{x}}\overline {\text{y}} + \overline {\text{w}} {\text{yz}} + {\text{w}}\overline {{\text{yz}}} + {\text{wx}}\overline {\text{y}} $$ D) $${\text{xz}} + \overline {\text{w}} {\text{yz}} + \overline {\text{w}} {\text{x}}\overline {\text{y}} + {\text{wxy}} + {\text{w}}\overline {\text{y}} {\text{z}}$$

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Answer: Option B

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