Digital Electronics MCQ Questions & Answers

61

A number is expressed in binary two's complement as 10011. Its decimal equivalent value is

A) 19 B) 13 C) -19 D) -13

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Answer & Solution

Answer: Option D

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62

Which one of the following is not a characteristic of RTL logic families?

A) High switching speed B) Poor noise immunity C) Low power dissipation D) Fan out is 5

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Answer & Solution

Answer: Option C

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63

Which of the following are universal gates?
1. AND
2. NAND
3. OR
4. NOR
5. NOT

A) 1, 2, 3, 4 and 5 B) 1, 3 and 4 only C) 2, 3 and 5 only D) 2 and 4 only

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Answer & Solution

Answer: Option D

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64

Combinational circuit

A) Always contains memory elements B) Never contains memory elements C) May sometimes contain memory elements D) Contains only memory

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Answer & Solution

Answer: Option B

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65

Two D-flip-flops, as shown below, are to be connected as a synchronous counter that goes through the following Q₁Q₀ sequence
00 → 01 → 11 → 10 → 00 → . . . . .
The inputs D₀ and D₁ respectively should be connected as
Digital Electronics mcq question image

A) $${\overline {\text{Q}} _1}{\text{ and }}{{\text{Q}}_0}$$ B) $${\overline {\text{Q}} _0}{\text{ and }}{{\text{Q}}_1}$$ C) $${\overline {\text{Q}} _1}{{\text{Q}}_0}{\text{ and }}{\overline {\text{Q}} _1}{{\text{Q}}_0}$$ D) $${\overline {\text{Q}} _1}{\overline {\text{Q}} _0}{\text{ and }}{{\text{Q}}_1}{{\text{Q}}_0}$$

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Answer & Solution

Answer: Option A

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66

The Boolean expression $$\left( {{\text{X}} + {\text{Y}}} \right)\left( {{\text{X}} + \overline {\text{Y}} } \right) + \overline {\left( {\overline {\text{X}} \overline {\text{Y}} } \right) + \overline {\text{X}} } $$ simplifies to

A) X B) Y C) XY D) X + Y

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Answer & Solution

Answer: Option A

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67

Given V_OH = 4 V, V_IH = 3.2 V, V_IL = 2 V, V_OL = 1.5 V, find noise margin?

A) 0.8 B) 2.5 C) 0.5 D) 2

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Answer & Solution

Answer: Option C

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68

In the above diagram, find out the correct expression of Y.
Digital Electronics mcq question image

A) Y = (A' + B')C + (DE) B) Y = (A' + B)C + (DE)' C) Y = (A' + B')C +(DE)' D) Y = (A + B)C' + (DE)'

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Answer & Solution

Answer: Option C

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69

The simplified form of the Boolean expression AB + A(B + C) + B(B + C) is given by

A) AB + AC B) B + AC C) BC + AC D) AB + C

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Answer & Solution

Answer: Option B

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70

The figure below shows a multiplexer where S₁ and S₀ are the select lines. I₀ to I₃ are the input data lines, EN is the enable line, and F(P, Q, R) is the output. F is
Digital Electronics mcq question image

A) $$\overline {\text{Q}} + {\text{PR}}$$ B) $${\text{P}} + {\text{Q}}\overline {\text{R}} $$ C) $${\text{PQ}} + \overline {\text{Q}} {\text{R}}$$ D) $${\text{P}}\overline {\text{Q}} {\text{R}} + \overline {\text{P}} {\text{Q}}$$

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Answer & Solution

Answer: Option C

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Digital Electronics MCQ Questions & Answers | ECE