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MCQOPTIONS
This section includes 2291 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
How many gates would be required to implement the following Boolean expression after simplification? XY + X(X + Z) + Y(X + Z) |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 2. |
What is the primary motivation for using Boolean algebra to simplify logic expressions? |
| A. | It may make it easier to understand the overall function of the circuit. |
| B. | It may reduce the number of gates. |
| C. | It may reduce the number of inputs required. |
| D. | all of the above |
| Answer» E. | |
| 3. |
An AND gate with schematic "bubbles" on its inputs performs the same function as a(n)________ gate. |
| A. | NOT |
| B. | OR |
| C. | NOR |
| D. | NAND |
| Answer» D. NAND | |
| 4. |
Applying DeMorgan's theorem to the expression , we get ________. |
| A. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0060a.gif"> |
| B. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0060b.gif"> |
| C. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0060c.gif"> |
| D. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0060d.gif"> |
| Answer» E. | |
| 5. |
Applying DeMorgan's theorem to the expression , we get ________. |
| A. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0050a.gif"> |
| B. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0050b.gif"> |
| C. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0050c.gif"> |
| D. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0050d.gif"> |
| Answer» B. <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0050b.gif"> | |
| 6. |
Which of the following is an important feature of the sum-of-products (SOP) form of expression? |
| A. | All logic circuits are reduced to nothing more than simple AND and OR gates. |
| B. | The delay times are greatly reduced over other forms. |
| C. | No signal must pass through more than two gates, not including inverters. |
| D. | The maximum number of gates that any signal must pass through is reduced by a factor of two. |
| Answer» D. The maximum number of gates that any signal must pass through is reduced by a factor of two. | |
| 7. |
Mapping the SOP expression , we get ________. |
| A. | (A) |
| B. | (B) |
| C. | (C) |
| D. | (D) |
| Answer» C. (C) | |
| 8. |
Derive the Boolean expression for the logic circuit shown below: |
| A. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0080a.gif"> |
| B. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0080b.gif"> |
| C. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0080c.gif"> |
| D. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0080d.gif"> |
| Answer» D. <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0080d.gif"> | |
| 9. |
Which is the correct logic function for this PAL diagram? |
| A. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_00250a.gif"> |
| B. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_00250b.gif"> |
| C. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_00250c.gif"> |
| D. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_00250d.gif"> |
| Answer» D. <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_00250d.gif"> | |
| 10. |
For the SOP expression , how many 0s are in the truth table's output column? |
| A. | zero |
| B. | 1 |
| C. | 4 |
| D. | 5 |
| Answer» D. 5 | |
| 11. |
Mapping the standard SOP expression , we get |
| A. | (A) |
| B. | (B) |
| C. | (C) |
| D. | (D) |
| Answer» C. (C) | |
| 12. |
The Boolean expression is logically equivalent to what single gate? |
| A. | NAND |
| B. | NOR |
| C. | AND |
| D. | OR |
| Answer» B. NOR | |
| 13. |
Applying the distributive law to the expression , we get ________. |
| A. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0030a.gif"> |
| B. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0030b.gif"> |
| C. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0030c.gif"> |
| D. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0030d.gif"> |
| Answer» E. | |
| 14. |
AC + ABC = AC |
| A. | True |
| B. | False |
| Answer» B. False | |
| 15. |
A Karnaugh map is a systematic way of reducing which type of expression? |
| A. | product-of-sums |
| B. | exclusive NOR |
| C. | sum-of-products |
| D. | those with overbars |
| Answer» D. those with overbars | |
| 16. |
How many gates would be required to implement the following Boolean expression before simplification? XY + X(X + Z) + Y(X + Z) |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 5 |
| Answer» E. | |
| 17. |
Which Boolean algebra property allows us to group operands in an expression in any order without affecting the results of the operation [for example, A + B = B + A]? |
| A. | associative |
| B. | commutative |
| C. | Boolean |
| D. | distributive |
| Answer» C. Boolean | |
| 18. |
For the SOP expression , how many 1s are in the truth table's output column? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 5 |
| Answer» D. 5 | |
| 19. |
Applying DeMorgan's theorem to the expression , we get ________. |
| A. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0040a.gif"> |
| B. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0040b.gif"> |
| C. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0040c.gif"> |
| D. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0040d.gif"> |
| Answer» B. <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0040b.gif"> | |
| 20. |
A truth table for the SOP expression has how many input combinations? |
| A. | 1 |
| B. | 2 |
| C. | 4 |
| D. | 8 |
| Answer» E. | |
| 21. |
Determine the values of A, B, C, and D that make the product term equal to 1. |
| A. | A = 0, B = 1, C = 0, D = 1 |
| B. | A = 0, B = 0, C = 0, D = 1 |
| C. | A = 1, B = 1, C = 1, D = 1 |
| D. | A = 0, B = 0, C = 1, D = 0 |
| Answer» B. A = 0, B = 0, C = 0, D = 1 | |
| 22. |
The systematic reduction of logic circuits is accomplished by: |
| A. | using Boolean algebra |
| B. | symbolic reduction |
| C. | TTL logic |
| D. | using a truth table |
| Answer» B. symbolic reduction | |
| 23. |
Which output expression might indicate a product-of-sums circuit construction? |
| A. | <img src="/_files/images/digital-electronics/basic-digital-electronics/mca5_1023a1.gif"> |
| B. | <img src="/_files/images/digital-electronics/basic-digital-electronics/mca5_1023b1.gif"> |
| C. | <img src="/_files/images/digital-electronics/basic-digital-electronics/mca5_1023c1.gif"> |
| D. | <img src="/_files/images/digital-electronics/basic-digital-electronics/mca5_1023d1.gif"> |
| Answer» E. | |
| 24. |
Occasionally, a particular logic expression will be of no consequence in the operation of a circuit, such as a BCD-to-decimal converter. These result in ________terms in the K-map and can be treated as either ________ or ________, in order to ________ the resulting term. |
| A. | don't care, 1s, 0s, simplify |
| B. | spurious, ANDs, ORs, eliminate |
| C. | duplicate, 1s, 0s, verify |
| D. | spurious, 1s, 0s, simplify |
| Answer» B. spurious, ANDs, ORs, eliminate | |
| 25. |
The NAND or NOR gates are referred to as "universal" gates because either: |
| A. | can be found in almost all digital circuits |
| B. | can be used to build all the other types of gates |
| C. | are used in all countries of the world |
| D. | were the first gates to be integrated |
| Answer» C. are used in all countries of the world | |
| 26. |
Converting the Boolean expression LM + M(NO + PQ) to SOP form, we get ________. |
| A. | LM + MNOPQ |
| B. | L + MNO + MPQ |
| C. | LM + M + NO + MPQ |
| D. | LM + MNO + MPQ |
| Answer» E. | |
| 27. |
One of De Morgan's theorems states that . Simply stated, this means that logically there is no difference between: |
| A. | a NOR and an AND gate with inverted inputs |
| B. | a NAND and an OR gate with inverted inputs |
| C. | an AND and a NOR gate with inverted inputs |
| D. | a NOR and a NAND gate with inverted inputs |
| Answer» B. a NAND and an OR gate with inverted inputs | |
| 28. |
Applying DeMorgan's theorem to the expression , we get ________ |
| A. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0070a.gif"> |
| B. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0070b.gif"> |
| C. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0070c.gif"> |
| D. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0070d.gif"> |
| Answer» B. <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0070b.gif"> | |
| 29. |
The output of an AND gate with three inputs, A, B, and C, is HIGH when ________. |
| A. | A = 1, B = 1, C = 0 |
| B. | A = 0, B = 0, C = 0 |
| C. | A = 1, B = 1, C = 1 |
| D. | A = 1, B = 0, C = 1 |
| Answer» D. A = 1, B = 0, C = 1 | |
| 30. |
Convert the following SOP expression to an equivalent POS expression. |
| A. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0160a.gif"> |
| B. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0160b.gif"> |
| C. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0160c.gif"> |
| D. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0160d.gif"> |
| Answer» C. <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0160c.gif"> | |
| 31. |
Determine the values of A, B, C, and D that make the sum term equal to zero. |
| A. | A = 1, B = 0, C = 0, D = 0 |
| B. | A = 1, B = 0, C = 1, D = 0 |
| C. | A = 0, B = 1, C = 0, D = 0 |
| D. | A = 1, B = 0, C = 1, D = 1 |
| Answer» C. A = 0, B = 1, C = 0, D = 0 | |
| 32. |
Derive the Boolean expression for the logic circuit shown below: |
| A. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0090a.gif"> |
| B. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0090b.gif"> |
| C. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0090c.gif"> |
| D. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0090d.gif"> |
| Answer» B. <img src="/_files/images/digital-electronics/digital-fundamentals/mca4_0090b.gif"> | |
| 33. |
What is the difference between a 7400 and a 7411 IC? |
| A. | 7400 has two four-input NAND gates; 7411 has three three-input AND gates |
| B. | 7400 has four two-input NAND gates; 7411 has three three-input AND gates |
| C. | 7400 has two four-input AND gates; 7411 has three three-input NAND gates |
| D. | 7400 has four two-input AND gates; 7411 has three three-input NAND gates |
| Answer» C. 7400 has two four-input AND gates; 7411 has three three-input NAND gates | |
| 34. |
If the output of a three-input AND gate must be a logic LOW, what must the condition of the inputs be? |
| A. | All inputs must be LOW. |
| B. | All inputs must be HIGH. |
| C. | At least one input must be LOW. |
| D. | At least one input must be HIGH. |
| Answer» D. At least one input must be HIGH. | |
| 35. |
What are the pin numbers of the outputs of the gates in a 7432 IC? |
| A. | 3, 6, 10, and 13 |
| B. | 1, 4, 10, and 13 |
| C. | 3, 6, 8, and 11 |
| D. | 1, 4, 8, and 11 |
| Answer» D. 1, 4, 8, and 11 | |
| 36. |
If the input to a NOT gate is A and the output is X, then ________. |
| A. | X = A |
| B. | <img src="/_files/images/digital-electronics/digital-fundamentals/mca3_0040b.gif"> |
| C. | X = 0 |
| D. | none of the above |
| Answer» C. X = 0 | |
| 37. |
If a 3-input AND gate has eight input possibilities, how many of those possibilities will result in a HIGH output? |
| A. | 1 |
| B. | 2 |
| C. | 7 |
| D. | 8 |
| Answer» B. 2 | |
| 38. |
The Boolean expression for a 3-input AND gate is ________. |
| A. | X = AB |
| B. | X = ABC |
| C. | X = A + B + C |
| D. | X = AB + C |
| Answer» C. X = A + B + C | |
| 39. |
What does the small bubble on the output of the NAND gate logic symbol mean? |
| A. | open collector output |
| B. | tristate |
| C. | The output is inverted. |
| D. | none of the above |
| Answer» D. none of the above | |
| 40. |
The output of an exclusive-OR gate is HIGH if ________. |
| A. | all inputs are LOW |
| B. | all inputs are HIGH |
| C. | the inputs are unequal |
| D. | none of the above |
| Answer» D. none of the above | |
| 41. |
A CMOS IC operating from a 3-volt supply will consume ________. |
| A. | less power than a TTL IC |
| B. | more power than a TTL IC |
| C. | the same power as a TTL IC |
| D. | no power at all |
| Answer» B. more power than a TTL IC | |
| 42. |
TTL operates from a ________. |
| A. | 9-volt supply |
| B. | 3-volt supply |
| C. | 12-volt supply |
| D. | 5-volt supply |
| Answer» E. | |
| 43. |
The power dissipation, PD, of a logic gate is the product of the ________. |
| A. | dc supply voltage and the peak current |
| B. | dc supply voltage and the average supply current |
| C. | ac supply voltage and the peak current |
| D. | ac supply voltage and the average supply current |
| Answer» C. ac supply voltage and the peak current | |
| 44. |
Which of the following choices meets the minimum requirement needed to create specialized waveforms that are used in digital control and sequencing circuits? |
| A. | basic gates, a clock oscillator, and a repetitive waveform generator |
| B. | basic gates, a clock oscillator, and a Johnson shift counter |
| C. | basic gates, a clock oscillator, and a DeMorgan pulse generator |
| D. | basic gates, a clock oscillator, a repetitive waveform generator, and a Johnson shift counter |
| Answer» B. basic gates, a clock oscillator, and a Johnson shift counter | |
| 45. |
The expression W(X + YZ) can be converted to SOP form by applying which law? |
| A. | associative law |
| B. | commutative law |
| C. | distributive law |
| D. | none of the above |
| Answer» D. none of the above | |
| 46. |
The output of a NOR gate is HIGH if ________. |
| A. | all inputs are HIGH |
| B. | any input is HIGH |
| C. | any input is LOW |
| D. | all inputs are LOW |
| Answer» E. | |
| 47. |
The switching speed of CMOS is now ________. |
| A. | competitive with TTL |
| B. | three times that of TTL |
| C. | slower than TTL |
| D. | twice that of TTL |
| Answer» B. three times that of TTL | |
| 48. |
How many pins does the 4049 IC have? |
| A. | 14 |
| B. | 16 |
| C. | 18 |
| D. | 20 |
| Answer» C. 18 | |
| 49. |
The commutative law of addition and multiplication indicates that: |
| A. | we can group variables in an AND or in an OR any way we want |
| B. | an expression can be expanded by multiplying term by term just the same as in ordinary algebra |
| C. | the way we OR or AND two variables is unimportant because the result is the same |
| D. | the factoring of Boolean expressions requires the multiplication of product terms that contain like variables |
| Answer» D. the factoring of Boolean expressions requires the multiplication of product terms that contain like variables | |
| 50. |
The output of an OR gate with three inputs, A, B, and C, is LOW when ________. |
| A. | A = 0, B = 0, C = 0 |
| B. | A = 0, B = 0, C = 1 |
| C. | A = 0, B = 1, C = 1 |
| D. | all of the above |
| Answer» B. A = 0, B = 0, C = 1 | |