MCQOPTIONS
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MCQOPTIONS
This section includes 1271 Mcqs, each offering curated multiple-choice questions to sharpen your Electronics & Communication Engineering knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Convert the following decimal number to 8-bit binary. |
| A. | 101110112 |
| B. | 110111012 |
| C. | 101111012 |
| D. | 101111002 |
| Answer» B. 110111012 | |
| 2. |
Parity systems are defined as either________ or ________ and will add an extra ________ tothe digital information being transmitted. |
| A. | positive, negative, byte |
| B. | odd, even, bit |
| C. | upper, lower, digit |
| D. | on, off, decimal |
| Answer» C. upper, lower, digit | |
| 3. |
What happens if the input is low in FSM? |
| A. | change of state |
| B. | no transition in state |
| C. | remains in a single state |
| D. | invalid state |
| Answer» C. remains in a single state | |
| 4. |
How many types of the counter are there? |
| A. | 2 |
| B. | 3 |
| C. | 4 |
| D. | 5 |
| Answer» C. 4 | |
| 5. |
Dynamic RAM employs |
| A. | capacitor or mosfet |
| B. | fet or jfet |
| C. | capacitor or bjt |
| D. | bjt or mos |
| Answer» B. fet or jfet | |
| 6. |
Can an encoder be called as multiplexer? |
| A. | no |
| B. | yes |
| C. | sometimes |
| D. | never |
| Answer» C. sometimes | |
| 7. |
ECL’s major disadvantage is that |
| A. | it requires more power |
| B. | it’s fanout capability is high |
| C. | it creates more noise |
| D. | it is slow |
| Answer» B. it’s fanout capability is high | |
| 8. |
In the given 4-to-1 multiplexer, if c1 = 0 and c0 = 1 then the output M is |
| A. | x0 |
| B. | x1 |
| C. | x2 |
| D. | x3 |
| Answer» C. x2 | |
| 9. |
If minuend = 0, subtrahend = 1 and borrow input = 1 in a full subtractor then the borrow output will be |
| A. | 0 |
| B. | 1 |
| C. | floating |
| D. | high impedance |
| Answer» C. floating | |
| 10. |
In the FSM diagram, what does arrow between the circles represent? |
| A. | change of state |
| B. | state |
| C. | output value |
| D. | initial state |
| Answer» B. state | |
| 11. |
What is ripple carry adder? |
| A. | the carry output of the lower order stage is connected to the carry input of the next higher order stage |
| B. | the carry input of the lower order stage is connected to the carry output of the next higher order stage |
| C. | the carry output of the higher order stage is connected to the carry input of the next lower order stage |
| D. | the carry input of the higher order stage is connected to the carry output of the lower order stage |
| Answer» B. the carry input of the lower order stage is connected to the carry output of the next higher order stage | |
| 12. |
ECL was invented in by |
| A. | 1956, baker clamp |
| B. | 1976, james r. biard |
| C. | 1956, hannon s. yourke |
| D. | 1976, yourke |
| Answer» D. 1976, yourke | |
| 13. |
On addition of -46 and +28 using 2’s complement, we get |
| A. | 00101110 |
| B. | 0101110 |
| C. | 00101111 |
| D. | 1001111 |
| Answer» C. 00101111 | |
| 14. |
PLD contains a large number of |
| A. | flip-flops |
| B. | gates |
| C. | registers |
| D. | all of the mentioned |
| Answer» E. | |
| 15. |
The instruction used in a program for executing them is stored in the |
| A. | cpu |
| B. | control unit |
| C. | memory |
| D. | microprocessor |
| Answer» D. microprocessor | |
| 16. |
The decimal number system represents the decimal number in the form of |
| A. | hexadecimal |
| B. | binary coded |
| C. | octal |
| D. | decimal |
| Answer» C. octal | |
| 17. |
If enable input is high then the multiplexer is |
| A. | enable |
| B. | disable |
| C. | saturation |
| D. | high impedance |
| Answer» C. saturation | |
| 18. |
Fusing process is |
| A. | reversible |
| B. | irreversible |
| C. | synchronous |
| D. | asynchronous |
| Answer» C. synchronous | |
| 19. |
The FPGA refers to |
| A. | first programmable gate array |
| B. | field programmable gate array |
| C. | first program gate array |
| D. | field program gate array |
| Answer» C. first program gate array | |
| 20. |
The sequential circuit is also called |
| A. | flip-flop |
| B. | latch |
| C. | strobe |
| D. | adder |
| Answer» C. strobe | |
| 21. |
How much locations an 8-bit address code can select in memory? |
| A. | 8 locations |
| B. | 256 locations |
| C. | 65,536 locations |
| D. | 131,072 locations |
| Answer» C. 65,536 locations | |
| 22. |
Number of outputs in a half adder |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| Answer» C. 3 | |
| 23. |
A combinational circuit that selects one from many inputs are |
| A. | encoder |
| B. | decoder |
| C. | demultiplexer |
| D. | multiplexer |
| Answer» E. | |
| 24. |
What is the major difference between half- adders and full-adders? |
| A. | full-adders are made up of two half-adders |
| B. | full adders can handle double-digit numbers |
| C. | full adders have a carry input capability |
| D. | half adders can handle only single-digit numbers |
| Answer» D. half adders can handle only single-digit numbers | |
| 25. |
Computers invariably use RAM for |
| A. | high complexity |
| B. | high resolution |
| C. | high speed main memory |
| D. | high flexibility |
| Answer» D. high flexibility | |
| 26. |
In ROM, each bit combination that comes out of the output lines is called |
| A. | memory unit |
| B. | storage class |
| C. | data word |
| D. | address |
| Answer» D. address | |
| 27. |
Finite state machines are combinational logic systems. |
| A. | true |
| B. | false |
| Answer» C. | |
| 28. |
The expression Y=(A+B)(B+C)(C+A) shows the operation. |
| A. | and |
| B. | pos |
| C. | sop |
| D. | nand |
| Answer» C. sop | |
| 29. |
(A + B)(A’ * B’) = ? |
| A. | 1 |
| B. | 0 |
| C. | ab |
| D. | ab’ |
| Answer» C. ab | |
| 30. |
A circuit that compares two numbers and determine their magnitude is called |
| A. | height comparator |
| B. | size comparator |
| C. | comparator |
| D. | magnitude comparator |
| Answer» E. | |
| 31. |
How many AND gates are required for a 1- to-8 multiplexer? |
| A. | 2 |
| B. | 6 |
| C. | 8 |
| D. | 5 |
| Answer» D. 5 | |
| 32. |
In FSM diagram what does circle represent? |
| A. | change of state |
| B. | state |
| C. | output value |
| D. | initial state |
| Answer» C. output value | |
| 33. |
Each product term of a group, w’.x.y’ and w.y, represents the in that group. |
| A. | input |
| B. | pos |
| C. | sum-of-minterms |
| D. | sum of maxterms |
| Answer» D. sum of maxterms | |
| 34. |
Complement of the expression A’B + CD’ is |
| A. | (a’ + b)(c’ + d) |
| B. | (a + b’)(c’ + d) |
| C. | (a’ + b)(c’ + d) |
| D. | (a + b’)(c + d’) |
| Answer» C. (a’ + b)(c’ + d) | |
| 35. |
Canonical form is a unique way of representing |
| A. | sop |
| B. | minterm |
| C. | boolean expressions |
| D. | pos |
| Answer» D. pos | |
| 36. |
The octal equivalent of the decimal number (417)10 is |
| A. | (641)8 |
| B. | (619)8 |
| C. | (640)8 |
| D. | (598)8 |
| Answer» B. (619)8 | |
| 37. |
Carry out BCD subtraction for (68) – (61) using 10’s complement method. |
| A. | 00000111 |
| B. | 01110000 |
| C. | 100000111 |
| D. | 011111000 |
| Answer» B. 01110000 | |
| 38. |
The number of logic gates and the way of their interconnections can be classified as |
| A. | logical network |
| B. | system network |
| C. | circuit network |
| D. | gate network |
| Answer» B. system network | |
| 39. |
When performing subtraction by addition in the 2’s-complement system |
| A. | the minuend and the subtrahend are both changed to the 2’s-complement |
| B. | the minuend is changed to 2’s- complement and the subtrahend is left in its original form |
| C. | the minuend is left in its original form and the subtrahend is changed to its 2’s- complement |
| D. | the minuend and subtrahend are both left in their original form |
| Answer» D. the minuend and subtrahend are both left in their original form | |
| 40. |
If A and B are the inputs of a half adder, the carry is given by |
| A. | a and b |
| B. | a or b |
| C. | a xor b |
| D. | a ex-nor b |
| Answer» B. a or b | |
| 41. |
Which IC is used for the implementation of 1-to-16 DEMUX? |
| A. | ic 74154 |
| B. | ic 74155 |
| C. | ic 74139 |
| D. | ic 74138 |
| Answer» B. ic 74155 | |
| 42. |
It should be kept in mind that don’t care terms should be used along with the terms that are present in |
| A. | minterms |
| B. | expressions |
| C. | k-map |
| D. | latches |
| Answer» B. expressions | |
| 43. |
How many addresses a MOS EPROM have? |
| A. | 1024 |
| B. | 512 |
| C. | 2516 |
| D. | 256 |
| Answer» D. 256 | |
| 44. |
The maximum noise voltage that may appear at the input of a logic gate without changing the logical state of its output is termed as |
| A. | noise margin |
| B. | noise immunity |
| C. | white noise |
| D. | signal to noise ratio |
| Answer» C. white noise | |
| 45. |
Moore machine output is synchronous. |
| A. | true |
| B. | false |
| Answer» B. false | |
| 46. |
ROMs retain data when |
| A. | power is on |
| B. | power is off |
| C. | system is down |
| D. | all of the mentioned |
| Answer» E. | |
| 47. |
A procedure that specifies finite set of steps is called |
| A. | algorithm |
| B. | flow chart |
| C. | chart |
| D. | venn diagram |
| Answer» B. flow chart | |
| 48. |
How many OR gates are required for an octal-to-binary encoder? |
| A. | 3 |
| B. | 2 |
| C. | 8 |
| D. | 10 |
| Answer» B. 2 | |
| 49. |
How many full adders are required to construct an m-bit parallel adder? |
| A. | m/2 |
| B. | m |
| C. | m-1 |
| D. | m+1 |
| Answer» D. m+1 | |
| 50. |
The full subtractor can be implemented using |
| A. | two xor and an or gates |
| B. | two half subtractors and an or gate |
| C. | two multiplexers and an and gate |
| D. | two comparators and an and gate |
| Answer» C. two multiplexers and an and gate | |