MCQOPTIONS
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MCQOPTIONS
This section includes 97 Mcqs, each offering curated multiple-choice questions to sharpen your Digital Electronics knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The term describes the time that an active signal must be present at the input to a flip-flop before an active clock edge is applied. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
A Schmitt trigger has a positive feedback circuit and experiences a phenomenon called . |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
A series circuit can be used to generate a power-up (automatic) reset signal. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 4. |
The output of a standard TTL NAND gate is used to pull an LED indicator LOW. The LED is in series with a 470- resistor. What is the current in the circuit when the LED is on? |
| A. | 7.02 mA |
| B. | 8.51 mA |
| C. | 10.63 mA |
| D. | 5.32 mA |
| Answer» B. 8.51 mA | |
| 5. |
Can the automatic circuit be used to set a flip-flop rather than reset the flip-flop? |
| A. | yes |
| B. | no |
| Answer» B. no | |
| 6. |
Which of the following flip-flop timing parameters indicates the time it takes a output to respond to a input? |
| A. | , |
| B. | , |
| C. | (L), |
| D. | (H) |
| Answer» C. (L), | |
| 7. |
How much setup time () is required for the 74LS76? |
| A. | 5 ns |
| B. | 10 ns |
| C. | 20 ns |
| D. | 40 ns |
| Answer» D. 40 ns | |
| 8. |
Decoupling capacitors should be tied from on one device to ground on a different device. |
| A. | True |
| B. | False |
| Answer» C. | |
| 9. |
A 0.01-F capacitor is recommended by TTL manufacturers for ________ the power supply. |
| A. | decoupling |
| B. | filtering |
| C. | rectifying |
| D. | grounding |
| Answer» B. filtering | |
| 10. |
A Schmitt trigger has + = 2.0 V and – = 1.2 V. What is the hysteresis voltage of the Schmitt trigger? |
| A. | 0.4 volt |
| B. | 0.6 volt |
| C. | 0.8 volt |
| D. | 1.2 volts |
| Answer» D. 1.2 volts | |
| 11. |
A Schmitt trigger has VT+ = 2.0 V and VT– = 1.2 V. What is the hysteresis voltage of the Schmitt trigger? |
| A. | 0.4 volt |
| B. | 0.6 volt |
| C. | 0.8 volt |
| D. | 1.2 volts |
| Answer» D. 1.2 volts | |
| 12. |
Counter with the value CT=15 will count |
| A. | 5times |
| B. | 10times |
| C. | 25times |
| D. | 15times |
| Answer» E. | |
| 13. |
The graphic symbol for OR gate is |
| A. | 1 |
| B. | ≥1 |
| C. | 1≤ |
| D. | 1 |
| Answer» C. 1≤ | |
| 14. |
Odd parity element in qualifying symbol is represented as |
| A. | 2k |
| B. | 2k+1 |
| C. | 2k-1 |
| D. | k |
| Answer» C. 2k-1 | |
| 15. |
The symbol ∑ represents |
| A. | Addition |
| B. | Subtraction |
| C. | Multiplication |
| D. | None |
| Answer» B. Subtraction | |
| 16. |
The letter which is used for dependency notation of enable action is |
| A. | V |
| B. | EN |
| C. | E |
| D. | N |
| Answer» C. E | |
| 17. |
To represent the relationship between input and output we use |
| A. | dependency notation |
| B. | scientific notation |
| C. | qualifying symbol |
| D. | rectangular shape |
| Answer» B. scientific notation | |
| 18. |
The graphic symbol of buffer is same as |
| A. | AND |
| B. | OR |
| C. | NAND |
| D. | buffer |
| Answer» E. | |
| 19. |
The positive logic is symbolized with |
| A. | 1 |
| B. | 0 |
| C. | up |
| D. | 11 |
| Answer» B. 0 | |
| 20. |
The diamond shape having bar on bottom represents |
| A. | high type |
| B. | low type |
| C. | mid type |
| D. | both a and b |
| Answer» C. mid type | |
| 21. |
Demultiplexer in qualifying symbols is represented as |
| A. | RCTR |
| B. | CTR |
| C. | Demultiplexer |
| D. | Multiplexer |
| Answer» D. Multiplexer | |
| 22. |
In graphic symbols, the & is used to show |
| A. | OR gate |
| B. | AND Gate |
| C. | Buffer |
| D. | XOR gate |
| Answer» B. AND Gate | |
| 23. |
The letter which is used for Dependency notation of AND gate is? |
| A. | A |
| B. | N |
| C. | D |
| D. | G |
| Answer» E. | |
| 24. |
The letter which is used for Dependency notation of OR gate is |
| A. | V |
| B. | N |
| C. | D |
| D. | G |
| Answer» B. N | |
| 25. |
According to the ANSI standard the outputs are placed in which blocks |
| A. | top |
| B. | bottom |
| C. | left |
| D. | right |
| Answer» E. | |
| 26. |
The graphic symbol of NOR is same as |
| A. | XOR |
| B. | OR |
| C. | NAND |
| D. | buffer |
| Answer» C. NAND | |
| 27. |
Data input is represented by the symbol |
| A. | DTA |
| B. | DT |
| C. | DAT |
| D. | D |
| Answer» E. | |
| 28. |
Read only memory in qualifying symbols is represented as |
| A. | RCTR |
| B. | ROM |
| C. | ROMM |
| D. | ROME |
| Answer» C. ROMM | |
| 29. |
7483 IC is enclosed in a package of |
| A. | 12pins |
| B. | 14pins |
| C. | 16pins |
| D. | 18pins |
| Answer» D. 18pins | |
| 30. |
Input/output without small circle is active at |
| A. | 1 |
| B. | 0 |
| C. | x |
| D. | y |
| Answer» B. 0 | |
| 31. |
The letter which is used for Dependency notation of controlled transmission is |
| A. | V |
| B. | D |
| C. | C |
| D. | X |
| Answer» E. | |
| 32. |
The diamond shape having bar on top represents |
| A. | high type |
| B. | low type |
| C. | mid type |
| D. | both a and b |
| Answer» B. low type | |
| 33. |
Arithmetic logic unit is represented by the qualifying symbol of |
| A. | AUL |
| B. | AL |
| C. | ALU |
| D. | AU |
| Answer» D. AU | |
| 34. |
The letter which is used for Dependency notation of control is |
| A. | V |
| B. | N |
| C. | C |
| D. | G |
| Answer» D. G | |
| 35. |
According to ANSI standard the inputs are placed in which blocks |
| A. | top |
| B. | bottom |
| C. | left |
| D. | right |
| Answer» D. right | |
| 36. |
According to the ANSI standard the carry input is designated by |
| A. | CI |
| B. | CO |
| C. | CP |
| D. | CT |
| Answer» B. CO | |
| 37. |
Magnitude comparator is represented by the qualifying symbol of |
| A. | MAG |
| B. | MUL |
| C. | COMP |
| D. | CTR |
| Answer» D. CTR | |
| 38. |
When an input or output is considered in terms of negative logic it is defined as |
| A. | Active high |
| B. | Active low |
| C. | Active medium |
| D. | None |
| Answer» C. Active medium | |
| 39. |
Even parity element in Qualifying symbols is represented as |
| A. | 2k |
| B. | 2k+1 |
| C. | 2k-1 |
| D. | k |
| Answer» B. 2k+1 | |
| 40. |
Standard for components recognition is the standard given by |
| A. | ANSI |
| B. | ANIS |
| C. | AISN |
| D. | AINS |
| Answer» B. ANIS | |
| 41. |
Random access memory is represented by the qualifying symbol of |
| A. | RAM |
| B. | ROM |
| C. | ROMM |
| D. | RAND |
| Answer» B. ROM | |
| 42. |
2^0 is equal to |
| A. | 2 |
| B. | 1 |
| C. | 0 |
| D. | undefined |
| Answer» C. 0 | |
| 43. |
Ripple counter is represented by the qualifying symbol of |
| A. | RCTR |
| B. | CTR |
| C. | ALU |
| D. | RCT |
| Answer» B. CTR | |
| 44. |
When an input/output is considered in terms of positive logic it is referred to as |
| A. | active low |
| B. | active high |
| C. | active medium |
| D. | off |
| Answer» C. active medium | |
| 45. |
The graphic symbol of AND is same as |
| A. | XOR |
| B. | OR |
| C. | NAND |
| D. | buffer |
| Answer» D. buffer | |
| 46. |
Counter is represented in qualifying symbols as |
| A. | RCTR |
| B. | CTR |
| C. | CP |
| D. | RCT |
| Answer» C. CP | |
| 47. |
Active low is represented the symbol of |
| A. | small square |
| B. | large square |
| C. | large triangle |
| D. | small triangle |
| Answer» E. | |
| 48. |
ANSI/IEEE standard for logic functions uses |
| A. | circular shape |
| B. | rectangular shape |
| C. | square shape |
| D. | triangular shape |
| Answer» C. square shape | |
| 49. |
An Input/output with small circle is active at |
| A. | 1 |
| B. | 0 |
| C. | x |
| D. | y |
| Answer» C. x | |
| 50. |
The negative logic is symbolized with |
| A. | 1 |
| B. | 0 |
| C. | up |
| D. | down |
| Answer» C. up | |