Digital Electronics MCQ Questions & Answers

Section 1 Section 2 Section 3 Section 4

51.
What is the 2's complement of 01101?

A. 10010

B. 10011

C. 1100

D. 1001

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52.
Which among the following ROMs exhibit/s the necessity of eliminating the PROM from the circuit?

A. EPROM

B. EEPROM

C. Both A and B

D. None of the above

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53.
Simplified expression of $${\text{Y}} = \left( {{\text{A}} + {\text{B}}} \right)\left( {{\text{A}} + \overline {\text{A}} \overline {\text{B}} } \right){\text{C}} + \overline {\text{A}} \left( {{\text{B}} + \overline {\text{C}} } \right) + \overline {\text{A}} {\text{B}} + {\text{ABC}}$$ is

A. $${\text{Y}} = {\text{C}}\left( {{\text{A + B}}} \right) + \overline {\text{A}} \left( {{\text{B}} + \overline {\text{C}} } \right)$$

B. $${\text{Y}} = {\text{C}}\left( {\overline {\text{A}} + \overline {\text{B}} } \right) + {\text{A}}\left( {\overline {\text{B}} + {\text{C}}} \right)$$

C. $${\text{Y}} = {\text{A}}\left( {{\text{B}} + {\text{C}}} \right) + {\text{B}}\left( {\overline {\text{A}} + \overline {\text{C}} } \right)$$

D. $${\text{Y}} = {\text{C}}\left( {\overline {\text{A}} + {\text{B}}} \right) + {\text{B}}\left( {{\text{A}} + \overline {\text{C}} } \right)$$

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54.
A counter is designed using J-K Flip-Flop as shown in figure Define its count sequence

A. 000, 001, 010, 011, 100 & repeats

B. 100, 011, 010, 001, 000 & repeat

C. 010, 011, 100, 000, 001 & repeats

D. 101, 110, 111, 000, 001, 010, 011, 100 repeats

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55.
When signed number are used in binary arithmetic, then which one of the following notations would have unique representation for zero?

A. Sign-magnitude

B. 1's complement

C. 2's complement

D. 9's complement

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56.
A S-R flip flop with a clock input can be converted to a 'D' flip flop using

A. Two inverters

B. The flip flop outputs (Q & $$\overline {\text{Q}} $$) connected to its inputs

C. One inverter

D. Not possible

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57.
A 2 × 2 ROM array is built with the help of diodes as shown in the circuit below. Here W₀ and W₁ are signals that select the word lines and B₀ and B₁ are signals that are output of the sense amps based on the stored data corresponding to the bit lines during the read operation.
During the read operation, the selected word line goes high and the other word line is in a high impedance state. As per the implementation shown in the circuit diagram above, what are the bits corresponding to D_ij (where i = 0 or 1 and j = 0 or 1) stored in the ROM?

A. \[\left[ \begin{gathered} 1\,\,\,\,\,0 \hfill \\ 0\,\,\,\,\,1 \hfill \\ \end{gathered} \right]\]

B. \[\left[ \begin{gathered} 0\,\,\,\,\,1 \hfill \\ 1\,\,\,\,\,0 \hfill \\ \end{gathered} \right]\]

C. \[\left[ \begin{gathered} 1\,\,\,\,\,0 \hfill \\ 1\,\,\,\,\,0 \hfill \\ \end{gathered} \right]\]

D. \[\left[ \begin{gathered} 1\,\,\,\,\,1 \hfill \\ 0\,\,\,\,\,0 \hfill \\ \end{gathered} \right]\]

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58.
Boolean expression $$\overline {{\text{A}} + \overline {\text{B}} + {\text{C}}} + \overline {\overline {\text{A}} + \overline {\text{B}} + {\text{C}}} + \overline {{\text{A}} + \overline {\text{B}} + \overline {\text{C}} } + {\text{ABC}}$$ reduces to

A. A

B. B

C. C

D. A + B + C

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59.
The logic function implemented by the circuit below is (ground implies a logic '0')

A. F = AND(P, Q)

B. F = OR(P, Q)

C. F = XNOR(P, Q)

D. F = XOR(P, Q)

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60.
Simplification of the function $${\text{f}} = \overline {{\text{AB}}} + \overline {\overline {\text{A}} + {\text{B}}} $$ is:

A. $${\text{AB}}$$

B. $${\text{A}} + {\text{B}}$$

C. $$\overline {\text{A}} \overline {\text{B}} $$

D. $$\overline {{\text{AB}}} $$

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Digital Electronics MCQ Questions & Answers | ECE

51. What is the 2's complement of 01101?

Answer & Solution

52. Which among the following ROMs exhibit/s the necessity of eliminating the PROM from the circuit?

Answer & Solution

53. Simplified expression of $${\text{Y}} = \left( {{\text{A}} + {\text{B}}} \right)\left( {{\text{A}} + \overline {\text{A}} \overline {\text{B}} } \right){\text{C}} + \overline {\text{A}} \left( {{\text{B}} + \overline {\text{C}} } \right) + \overline {\text{A}} {\text{B}} + {\text{ABC}}$$ is

Answer & Solution

54. A counter is designed using J-K Flip-Flop as shown in figure Define its count sequence

Answer & Solution

55. When signed number are used in binary arithmetic, then which one of the following notations would have unique representation for zero?

Answer & Solution

56. A S-R flip flop with a clock input can be converted to a 'D' flip flop using

Answer & Solution

Answer & Solution

58. Boolean expression $$\overline {{\text{A}} + \overline {\text{B}} + {\text{C}}} + \overline {\overline {\text{A}} + \overline {\text{B}} + {\text{C}}} + \overline {{\text{A}} + \overline {\text{B}} + \overline {\text{C}} } + {\text{ABC}}$$ reduces to

Answer & Solution

59. The logic function implemented by the circuit below is (ground implies a logic '0')

Answer & Solution

60. Simplification of the function $${\text{f}} = \overline {{\text{AB}}} + \overline {\overline {\text{A}} + {\text{B}}} $$ is:

Answer & Solution

Read More Section(Digital Electronics)

51.
What is the 2's complement of 01101?

52.
Which among the following ROMs exhibit/s the necessity of eliminating the PROM from the circuit?

53.
Simplified expression of $${\text{Y}} = \left( {{\text{A}} + {\text{B}}} \right)\left( {{\text{A}} + \overline {\text{A}} \overline {\text{B}} } \right){\text{C}} + \overline {\text{A}} \left( {{\text{B}} + \overline {\text{C}} } \right) + \overline {\text{A}} {\text{B}} + {\text{ABC}}$$ is

54.
A counter is designed using J-K Flip-Flop as shown in figure Define its count sequence

55.
When signed number are used in binary arithmetic, then which one of the following notations would have unique representation for zero?

56.
A S-R flip flop with a clock input can be converted to a 'D' flip flop using

58.
Boolean expression $$\overline {{\text{A}} + \overline {\text{B}} + {\text{C}}} + \overline {\overline {\text{A}} + \overline {\text{B}} + {\text{C}}} + \overline {{\text{A}} + \overline {\text{B}} + \overline {\text{C}} } + {\text{ABC}}$$ reduces to

59.
The logic function implemented by the circuit below is (ground implies a logic '0')

60.
Simplification of the function $${\text{f}} = \overline {{\text{AB}}} + \overline {\overline {\text{A}} + {\text{B}}} $$ is: