MCQOPTIONS
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MCQOPTIONS
This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Boolean Algebra and Logic Simplification knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
Four J-K flip-flops are cascaded with their J-K inputs tied HIGH. If the input frequency (f in ) to the first flip-flop is 32 kHz, the output frequency (f out ) is ________. |
| A. | 1 kHz |
| B. | 2 kHz |
| C. | 4 kHz |
| D. | 16 kHz |
| Answer» C. 4 kHz | |
| 2. |
The output pulse width of a 555 monostable circuit with R 1 = 4.7 k and C 1 = 47 F is ________. |
| A. | 24 s |
| B. | 24 ms |
| C. | 243 ms |
| D. | 243 s |
| Answer» D. 243 s | |
| 3. |
A 555 operating as a monostable multivibrator has a C 1 = 100 F. Determine R 1 for a pulse width of 500 ms. |
| A. | 45 |
| B. | 455 |
| C. | 4.5 k |
| D. | 455 k |
| Answer» D. 455 k | |
| 4. |
The output pulse width for a 555 monostable circuit with R 1 = 3.3 k and C 1 = 0.02 F is ________. |
| A. | 7.3 s |
| B. | 73 s |
| C. | 7.3 ms |
| D. | 73 ms |
| Answer» C. 7.3 ms | |
| 5. |
A 555 operating as a monostable multivibrator has an R 1 of 220 k . Determine C 1 for a pulse width of 4 ms. |
| A. | 0.017 F |
| B. | 17 pF |
| C. | 170 pF |
| D. | 1,700 F |
| Answer» B. 17 pF | |
| 6. |
An RC circuit used in a 74122 retriggerable one-shot has an R EXT of 100 k and a C EXT of 0.005 F. The pulse width is ________. |
| A. | 70 s |
| B. | 16 s |
| C. | 160 s |
| D. | 32 s |
| Answer» D. 32 s | |
| 7. |
A 555 operating as a monostable multivibrator has a C 1 = 0.01 F. Determine R 1 for a pulse width of 2 ms. |
| A. | 200 k |
| B. | 182 k |
| C. | 91 k |
| D. | 182 |
| Answer» C. 91 k | |
| 8. |
An RC circuit used in a nonretriggerable 74121 one-shot has an R EXT of 49 k and a C EXT of 0.2 F. The pulse width (t W ) is approximately ________. |
| A. | 6.9 s |
| B. | 6.9 ms |
| C. | 69 ms |
| D. | 690 ms |
| Answer» C. 69 ms | |
| 9. |
The toggle condition in a master-slave J-K flip-flop means that Q and will switch to their ________ state(s) at the ________. |
| A. | opposite, active clock edge |
| B. | inverted, positive clock edge |
| C. | quiescent, negative clock edge |
| D. | reset, synchronous clock edge |
| Answer» B. inverted, positive clock edge | |
| 10. |
A 555 operating as a monostable multivibrator has an R 1 of 1 M . Determine C 1 for a pulse width of 2 s. |
| A. | 1.8 F |
| B. | 18 F |
| C. | 18 pF |
| D. | 18 nF |
| Answer» B. 18 F | |
| 11. |
The phenomenon of interpreting unwanted signals on J and K while C p (clock pulse) is HIGH is called ________. |
| A. | parity error checking |
| B. | ones catching |
| C. | digital discrimination |
| D. | digital filtering |
| Answer» C. digital discrimination | |
| 12. |
Propagation delay time, t PLH , is measured from the ________. |
| A. | triggering edge of the clock pulse to the LOW-to-HIGH transition of the output |
| B. | triggering edge of the clock pulse to the HIGH-to-LOW transition of the output |
| C. | preset input to the LOW-to-HIGH transition of the output |
| D. | clear input to the HIGH-to-LOW transition of the output |
| Answer» B. triggering edge of the clock pulse to the HIGH-to-LOW transition of the output | |