MCQOPTIONS
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MCQOPTIONS
This section includes 49 Mcqs, each offering curated multiple-choice questions to sharpen your Digital Logic Design knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
In don't cares map input are marked by |
| A. | 0 |
| B. | 1 |
| C. | star |
| D. | X |
| Answer» E. | |
| 2. |
The multiple variable XOR operation is defined as |
| A. | inverted or function |
| B. | prime function |
| C. | even function |
| D. | odd function |
| Answer» E. | |
| 3. |
Two bit subtraction is done by |
| A. | Demultiplexer |
| B. | Multiplexer |
| C. | full subtract or |
| D. | half subtract or |
| Answer» E. | |
| 4. |
OR operation is achieved through a NAND gate with Additional |
| A. | AND gates |
| B. | OR gates |
| C. | XOR gates |
| D. | Inverters |
| Answer» D. Inverters | |
| 5. |
Designing combinational circuits we consider? |
| A. | maximum no of gates |
| B. | minimum no of gates |
| C. | two gates |
| D. | three gates |
| Answer» C. two gates | |
| 6. |
Full adder performs addition on |
| A. | 2 bits |
| B. | 3 bits |
| C. | 4 bits |
| D. | 5 bits |
| Answer» C. 4 bits | |
| 7. |
In analysis procedure information processing task is correlated with |
| A. | BCD code |
| B. | excess3 code |
| C. | map |
| D. | truth table |
| Answer» E. | |
| 8. |
For code conversion how many bits are required for BCD input and Excess-3 outputs? |
| A. | 3 inputs and 2 outputs |
| B. | 4 inputs and 4 outputs |
| C. | 4 inputs and 3 outputs |
| D. | None |
| Answer» C. 4 inputs and 3 outputs | |
| 9. |
In designing a combinational circuits, truth table defines the relationship of |
| A. | logical circuit |
| B. | input |
| C. | output |
| D. | input and output |
| Answer» E. | |
| 10. |
To implement the Boolean function with NAND gates we convert the function to |
| A. | AND logic |
| B. | OR logic |
| C. | NOR logic |
| D. | NAND logic |
| Answer» E. | |
| 11. |
Circuits whose output depends on directly present input is called |
| A. | combinational circuit |
| B. | sequential circuit |
| C. | combinational sequence |
| D. | series |
| Answer» B. sequential circuit | |
| 12. |
Full subtract circuits have |
| A. | 3 inputs and 2 outputs |
| B. | 1 input and 1 output |
| C. | both a and b |
| D. | None |
| Answer» B. 1 input and 1 output | |
| 13. |
The connection from output to one of input gate is |
| A. | undefined |
| B. | shifted |
| C. | feedback |
| D. | wire |
| Answer» D. wire | |
| 14. |
The analysis of combinational circuits is a |
| A. | Direct Process |
| B. | indirect process |
| C. | Reverse Process |
| D. | None |
| Answer» B. indirect process | |
| 15. |
The truth table can directly be obtained from |
| A. | map |
| B. | logic diagram |
| C. | flow chart |
| D. | expression |
| Answer» C. flow chart | |
| 16. |
For digital circuits logical circuits can be |
| A. | combinational |
| B. | sequential |
| C. | logical |
| D. | both a and b |
| Answer» E. | |
| 17. |
Besides NAND gate universal gate is |
| A. | AND gate |
| B. | OR gate |
| C. | NOR gate |
| D. | XOR gates |
| Answer» D. XOR gates | |
| 18. |
Logic gates takes input signals and generates signals to |
| A. | within gate |
| B. | input |
| C. | output |
| D. | both a and b |
| Answer» D. both a and b | |
| 19. |
When both inputs are different the output of XOR is |
| A. | 1 |
| B. | 0 |
| C. | x |
| D. | 10 |
| Answer» B. 0 | |
| 20. |
AND gates are converted to NAND gates using |
| A. | invert OR |
| B. | AND invert |
| C. | NAND invert |
| D. | both a and b |
| Answer» C. NAND invert | |
| 21. |
Flip flop are constructed using |
| A. | AND gate |
| B. | OR gate |
| C. | NAND gate |
| D. | NOR gate |
| Answer» D. NOR gate | |
| 22. |
The most significant bit of arithmetic addition is called |
| A. | overflow |
| B. | carry |
| C. | output |
| D. | zero bit |
| Answer» C. output | |
| 23. |
Combinational circuits are described by |
| A. | Boolean functions |
| B. | algebraic functions |
| C. | geometric functions |
| D. | linear equations |
| Answer» B. algebraic functions | |
| 24. |
OR gates are converted to NAND gates using |
| A. | invert OR |
| B. | AND invert |
| C. | NAND invert |
| D. | both a and b |
| Answer» B. AND invert | |
| 25. |
Rather than AND-OR gates combinational circuits are made by |
| A. | NAND-NOR |
| B. | NAND-OR |
| C. | OR only |
| D. | AND only |
| Answer» B. NAND-OR | |
| 26. |
Variable in Boolean expressions can be expressed as |
| A. | primed |
| B. | unprimed |
| C. | even |
| D. | both a and b |
| Answer» E. | |
| 27. |
The NAND logic conversion is facilitated using symbols of |
| A. | invert OR |
| B. | AND invert |
| C. | NAND invert |
| D. | both a and b |
| Answer» E. | |
| 28. |
In the design procedure input output values are assigned with |
| A. | numeric values |
| B. | letter symbols |
| C. | 0's |
| D. | 1's |
| Answer» C. 0's | |
| 29. |
Circuit that is said to be universal gate is |
| A. | AND |
| B. | OR |
| C. | NAND |
| D. | XOR |
| Answer» D. XOR | |
| 30. |
The result of two bit subtraction is called? |
| A. | difference bit |
| B. | least significant bit |
| C. | most significant bit |
| D. | carry bit |
| Answer» B. least significant bit | |
| 31. |
The most basic arithmetic function is |
| A. | addition |
| B. | subtraction |
| C. | multiplication |
| D. | division |
| Answer» B. subtraction | |
| 32. |
Two bit addition is done by |
| A. | ripple carry adder |
| B. | carry sum adder |
| C. | full adder |
| D. | half adder |
| Answer» E. | |
| 33. |
The simplified expression of full subtractor borrow is |
| A. | B=xy+xz+yz |
| B. | B=xy'+xz'+yz |
| C. | B=x'y+xy+xz |
| D. | B=x'y+x'z+yz |
| Answer» E. | |
| 34. |
In NAND logic analysis procedure application requires repeated application of |
| A. | truth table |
| B. | feedback theorem |
| C. | demorgan's theorem |
| D. | K-map |
| Answer» D. K-map | |
| 35. |
The convenient way is to convert NAND logic diagram to |
| A. | AND diagram |
| B. | OR diagram |
| C. | AND-OR diagram |
| D. | NOR diagram |
| Answer» D. NOR diagram | |
| 36. |
If two systems have different codes then circuit inserted between them is |
| A. | combinational circuit |
| B. | sequential circuit |
| C. | combinational sequence circuit |
| D. | conversion circuit |
| Answer» E. | |
| 37. |
Sometimes it is necessary to use the output of one system as the |
| A. | input to another |
| B. | carry to another |
| C. | borrow to another |
| D. | None |
| Answer» D. None | |
| 38. |
Dual of the NAND function is |
| A. | AND function |
| B. | OR function |
| C. | NOR function |
| D. | NAND function |
| Answer» D. NAND function | |
| 39. |
The simplified expression of half subtractor borrow is |
| A. | B=x+y |
| B. | B=xy |
| C. | B=x'y |
| D. | B=xy' |
| Answer» D. B=xy' | |
| 40. |
Half subtractor have an output to specify that 1 has been? |
| A. | complemented |
| B. | borrowed |
| C. | carried |
| D. | primed |
| Answer» C. carried | |
| 41. |
Practical design procedure have some |
| A. | gates |
| B. | circuits |
| C. | constraints |
| D. | protocols |
| Answer» D. protocols | |
| 42. |
Circuits that employs memory elements in addition to gates is called |
| A. | combinational circuit |
| B. | sequential circuit |
| C. | combinational sequence |
| D. | series |
| Answer» C. combinational sequence | |
| 43. |
The subtraction of two binary numbers is accomplished by taking complement of Subtrahend and adding into |
| A. | output |
| B. | subtract or |
| C. | Minuend |
| D. | remainder |
| Answer» D. remainder | |
| 44. |
When both inputs are 1, the output of XOR is |
| A. | 1 |
| B. | 0 |
| C. | x |
| D. | 10 |
| Answer» C. x | |
| 45. |
Full Adder combinational circuits has 3 inputs and |
| A. | 2 outputs |
| B. | 1 output |
| C. | 3 outputs |
| D. | None |
| Answer» E. | |
| 46. |
Code conversion circuits mostly uses |
| A. | AND-OR gates |
| B. | AND gates |
| C. | OR gates |
| D. | XOR gates |
| Answer» B. AND gates | |
| 47. |
Designing combinational circuit involves |
| A. | 4 steps |
| B. | 5 steps |
| C. | 6 steps |
| D. | 8 steps |
| Answer» D. 8 steps | |
| 48. |
The NOR function is the dual of |
| A. | AND function |
| B. | OR function |
| C. | XOR function |
| D. | NAND function |
| Answer» E. | |
| 49. |
Half adder circuits requires two binary |
| A. | Inputs |
| B. | Outputs |
| C. | Digits |
| D. | Both a and b |
| Answer» E. | |