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-8 section-3

Which of the following is the Boolean function for Majority Voting, assuming A, B, C are inputs and Y is output?

A) Y = AB + AC + CB B) Y = A + B + C C) Y = ABC D) Y = AB + BC

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Answer & Solution

Answer: Option A

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Flash ADC is

A) A serial ADC B) A parallel ADC C) Partly serial and partly parallel ADC D) Successive approximation ADC

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Answer & Solution

Answer: Option B

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Find the faulty even parity code
1. 100110010
2. 011101010
3. 10111111010001010

A) only 2 B) only 3 C) both 2 and 3 D) both 1 and 3

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Answer & Solution

Answer: Option A

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In Boolean Algebra A. $$\overline {\text{A}} $$ is equal to

A) 1 B) A C) A² D) 0

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Answer & Solution

Answer: Option D

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The inverter 74 AL S01 has the following specifications:
I_{OH max} = -0.4 mA, I_{OL max} = 8 mA, I_{IH max} = 20 µA, I_{IL max} = -0.1 mA.
The fan out based on the above will be

A) 10 B) 20 C) 60 D) 100

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Answer & Solution

Answer: Option B

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What is the hexadecimal equivalent of this binary number (1110)₂?

A) F B) B C) A D) E

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Answer & Solution

Answer: Option D

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In the circuit shown below Q₁ has negligible collector-to-emitter saturation voltage and the diode drops negligible voltage across it under forward bias. If V_cc is +5 V, X and Y are digital signals with 0 V as logic 0 and V_cc as logic 1, the Boolean expression for Z is
Digital Electronics mcq question image

A) $${\text{XY}}$$ B) $$\overline {\text{X}} {\text{Y}}$$ C) $${\text{X}}\overline {\text{Y}} $$ D) $$\overline {{\text{XY}}} $$

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Answer & Solution

Answer: Option B

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Consider the following digital circuits:
1. Multiplexers
2. Read Only Memories
3. D-latch
4. Circuit as shown
Which of these come under the class of combinational circuits?
Digital Electronics mcq question image

A) 1 and 2 B) 3 and 4 C) 1, 2 and 3 D) 1, 2, 3 and 4

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Answer & Solution

Answer: Option A

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If (2.3)_{base 4} + (1.2)_{base 4} = (y)_{base 4}, what is the value of y?

A) 10.1 B) 10.01 C) 10.2 D) 1.02

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Answer & Solution

Answer: Option A

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By using only 4 : 1 MUX, it is possible to realize:

A) Any 3 variable function B) Only 2 variable function C) Any 2 and 3 variable function D) Few 3 variable functions

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Answer & Solution

Answer: Option D

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