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-1 section-2

A 5 bit DAC has a current output. For a digital input of 10100, an output current of 10 mA is produced. What will be the output current for a digital input of 11101?

A) 14.5 mA B) 10 mA C) 100 mA D) Not possible to calculate

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Answer & Solution

Answer: Option A

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In the figure shown, X₂X₁X₀ will be 1's complement of A₂A₁A₀ if
$${\overline {\text{A}} _0} = {\overline {\text{A}} _1} = {\overline {\text{A}} _2}$$
Digital Electronics mcq question image

A) Y = 0 B) Y = 1 C) $${\text{Y}} = {\overline {\text{A}} _0} = {\overline {\text{A}} _1} = {\overline {\text{A}} _2}$$ D) $${\text{Y}} = {{\text{A}}_0} = {{\text{A}}_1} = {{\text{A}}_2}$$

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Answer: Option B

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A standard CMOS inverter is designed with equal rise and fall times (β_n = β_p). If the width of the PMOS transistor in the inverter is increased, what would be the effect on the LOW noise margin (NM_L) and the HIGH noise margin NM_H ?

A) NM_L decreases and NM_H increases B) No change in the noise margins C) Both NM_L and NM_H increase D) NM_L increases and NM_H decreases

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Answer: Option D

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A divide-by-78 counter can be realized by using

A) 6 no's of mod-13 counters B) 13 no's of mod-6 counters C) One mod-13 counter following by one mod-6 counters D) 13 no's of mod-13 counters

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Answer: Option C

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The circuit shown in the following figure is a . . . . . . . . gate.
Digital Electronics mcq question image

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

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Answer: Option C

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A 10 bit ADC has a range of ±5 V. The resolution of the ADC is approximately

A) 10 mV B) 100 mV C) 0.5 V D) 1 V

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Answer: Option A

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A dynamic RAM consists of

A) 6 transistors B) 2 transistors and 2 capacitors C) 1 transistor and 1 capacitor D) 2 capacitors only

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Answer: Option C

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Considering signed-magnitude representation for negative numbers, -42 will be stored into an 8-bit memory space as

A) 10101010 B) 10110111 C) 10110010 D) 10100001

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Answer: Option A

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The decoding error of the counter can be avoided by

A) Increasing propagation delay of flip-flops used in the counter B) Using very fast logic gates C) Using the strobe signal D) Reducing the propagation delay of flip-flops used in the counter

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Answer: Option D

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The current mode logic (CML) is same as

A) LSI B) CMOS C) TTL D) ECL

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Answer: Option D

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