| 21. | Which combination of gates does not allow the implementation of an arbitrary Boolean function? |
| a. | OR gates and AND gates only |
| b. | OR gates and exclusive OR gate only |
| c. | OR gates and NOT gates only |
| d. | NAND gates only |
| View Answer Report Discuss Too Difficult! Search Google |
|
Answer: (a).OR gates and AND gates only
|
| 22. | How many full adders are required to construct an m-bit parallel adder ? |
| a. | m/2 |
| b. | m-1 |
| c. | m |
| d. | m+1 |
| View Answer Report Discuss Too Difficult! Search Google |
|
Answer: (b).m-1
|
| 23. | Parallel adders are |
| a. | combinational logic circuits |
| b. | sequential logic circuits |
| c. | both a and b |
| d. | None of these |
| View Answer Report Discuss Too Difficult! Search Google |
|
Answer: (a).combinational logic circuits
|
| 24. | The most efficient method followed by computers to multiply two unsigned numbers is _______ . |
| a. | Booth algorithm |
| b. | Bit pair recording of multipliers |
| c. | Restoring algorithm |
| d. | Non restoring algorithm |
| View Answer Report Discuss Too Difficult! Search Google |
|
Answer: (b).Bit pair recording of multipliers
|
| 25. | For the addition of large integers most of the systems make use of ______ . |
| a. | Fast adders |
| b. | Full adders |
| c. | Carry look-ahead adders |
| d. | None of the above |
| View Answer Report Discuss Too Difficult! Search Google |
|
Answer: (c).Carry look-ahead adders
|
| 26. | In a normal n-bit adder , to find out if an overflow as occurred we make use of _____ . |
| a. | And gate |
| b. | Nand gate |
| c. | Nor gate |
| d. | Xor gate |
| View Answer Report Discuss Too Difficult! Search Google |
|
Answer: (d).Xor gate
|
| 27. | In the implementation of a Multiplier circuit in the system we make use of _______ . |
| a. | Counter |
| b. | Flip flop |
| c. | Shift register |
| d. | Push down stack |
| View Answer Report Discuss Too Difficult! Search Google |
|
Answer: (c).Shift register
|
| 28. | When 1101 is used to divide 100010010 the remainder is ______ . |
| a. | 101 |
| b. | 11 |
| c. | 0 |
| d. | 1 |
| View Answer Report Discuss Too Difficult! Search Google |
|
Answer: (d).1
|
| 29. | The NAND gate output will be low if the two inputs are |
| a. | 00 |
| b. | 01 |
| c. | 10 |
| d. | 11 |
| View Answer Report Discuss Too Difficult! Search Google |
|
Answer: (d).11
|
| 30. | The output of a logic gate is 1 when all its inputs are at logic 0. the gate is either |
| a. | a NAND or an EX-OR |
| b. | an OR or an EX-NOR |
| c. | an AND or an EX-OR |
| d. | a NOR or an EX-NOR |
| View Answer Report Discuss Too Difficult! Search Google |
|
Answer: (d).a NOR or an EX-NOR
|
