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-6 section-2

Which of the following Boolean expression is incorrect?

A) $${\text{A}} + \overline {\text{A}} {\text{B}} = {\text{A}} + {\text{B}}$$ B) A + AB = B C) (A + B)(A + C) = A + BC D) (A + B')(A + B) = A

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Answer & Solution

Answer: Option B

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A 12-bit A/D converter has a full-scale analog input of 5 V. Its resolution is:

A) 1.22 mV B) 2.44 mV C) 3.66 mV D) 4.88 mV

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Answer: Option A

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$$\frac{{{{34}_{\text{x}}}}}{{{2_{\text{x}}}}} = {16_{\text{x}}}$$, What is the value of base X

A) 8 B) 6 C) 4 D) 9

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Answer: Option A

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In a binary source, 0's occur three times as often as 1's. What is the information contained in the 1s?

A) 0.415 bit B) 0.333 bit C) 3 bit D) 2 bit

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Answer: Option D

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An 8 bit DAC has a full scale output of 2 mA and full scale error of ±0.5%. If input is 10000000 the range of outputs is . . . . . . . .

A) 994 to 1014 µA B) 990 to 1020 µA C) 800 to 1200 µA D) None of the above

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Answer: Option A

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The following is equivalent to
Digital Electronics mcq question image

A) OR gate B) NAND gate C) EX-OR gate D) None of these

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Answer: Option B

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In case a problem has no don't care states which of the following is a correct statement?

A) The information in a truth table is not sufficient to complete a Karnaugh map B) The information in a Karnaugh map is not sufficient to complete a truth table C) The information in a truth table is sufficient to complete a Karnaugh map D) Truth table has no relationship with its Karnaugh map

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Answer: Option C

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What are the two types of basic adder circuits?

A) Half adder and full adder B) Half adder and parallel adder C) Asynchronous adder and synchronous adder D) One's complement adder and two's complement adder

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Answer: Option A

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A digital system is required to amplify a binary encoded audio signal. The user should be able to control the gain of the amplifier from a minimum to a maximum in 100 increments. The minimum number of bits required to encode, in straight binary, is

A) 8 B) 6 C) 5 D) 7

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Answer: Option D

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In certain number system with base or radix x, if (123)_x + (21)_x = (210)_x then base or radix x of number system is:

A) 5 B) 4 C) 3 D) 2

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Answer: Option B

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