MCQOPTIONS
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MCQOPTIONS
This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Digital Circuits knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A J-K flip-flop with J = 1 and K = 1 has a 20 kHz clock input. The Q output is _____________ |
| A. | Constantly LOW |
| B. | Constantly HIGH |
| C. | A 20 kHz square wave |
| D. | A 10 kHz square wave |
| Answer» E. | |
| 2. |
What does the direct line on the clock input of a J-K flip-flop mean? |
| A. | Level enabled |
| B. | Positive edge triggered |
| C. | negative edge triggered |
| D. | Level triggered |
| Answer» E. | |
| 3. |
What does the circle on the clock input of a J-K flip-flop mean? |
| A. | Level enabled |
| B. | Positive edge triggered |
| C. | negative edge triggered |
| D. | Level triggered |
| Answer» D. Level triggered | |
| 4. |
The flip-flops which has not any invalid states are _____________ |
| A. | S-R, J-K, D |
| B. | S-R, J-K, T |
| C. | J-K, D, S-R |
| D. | J-K, D, T |
| Answer» E. | |
| 5. |
Both the J-K & the T flip-flop are derived from the basic _____________ |
| A. | S-R flip-flop |
| B. | S-R latch |
| C. | D latch |
| D. | D flip-flop |
| Answer» C. D latch | |
| 6. |
The S-R latch composed of NAND gates is called an active low circuit because _____________ |
| A. | It is only activated by a positive level trigger |
| B. | It is only activated by a negative level trigger |
| C. | It is only activated by either a positive or negative level trigger |
| D. | It is only activated by sinusoidal trigger |
| Answer» C. It is only activated by either a positive or negative level trigger | |
| 7. |
The flip-flop is only activated by _____________ |
| A. | Positive edge trigger |
| B. | Negative edge trigger |
| C. | Either positive or Negative edge trigger |
| D. | Sinusoidal trigger |
| Answer» D. Sinusoidal trigger | |
| 8. |
How many stable states combinational circuits have? |
| A. | 3 |
| B. | 4 |
| C. | 2 |
| D. | 5 |
| Answer» D. 5 | |
| 9. |
The only difference between a combinational circuit and a flip-flop is that _____________ |
| A. | The flip-flop requires previous state |
| B. | The flip-flop requires next state |
| C. | The flip-flop requires a clock pulse |
| D. | The flip-flop depends on the past as well as present states |
| Answer» D. The flip-flop depends on the past as well as present states | |
| 10. |
In J-K flip-flop, the function K=J is used to realize _____________ |
| A. | D flip-flop |
| B. | S-R flip-flop |
| C. | T flip-flop |
| D. | S-K flip-flop |
| Answer» D. S-K flip-flop | |
| 11. |
In a J-K flip-flop, if J=K the resulting flip-flop is referred to as _____________ |
| A. | D flip-flop |
| B. | S-R flip-flop |
| C. | T flip-flop |
| D. | S-K flip-flop |
| Answer» D. S-K flip-flop | |
| 12. |
The characteristic equation of J-K flip-flop is ______________ |
| A. | Q(n+1)=JQ(n)+K Q(n) |
| B. | Q(n+1)=J Q(n)+KQ'(n) |
| C. | Q(n+1)=JQ'(n)+KQ(n) |
| D. | Q(n+1)=JQ'(n)+K Q(n) |
| Answer» E. | |