Flip-Flops problems
- 1. An edge-triggered flip-flop can change states only when ________.
Options- A. the trigger is HIGH
- B. the D input is HIGH
- C. the trigger is LOW
- D. the trigger input changes levels Discuss
Correct Answer: the trigger input changes levels
- 2. The 74121 nonretriggerable multivibrator can have the output pulse set by a single external component. This component is a(n) ________.
Options- A. capacitor
- B. inductor
- C. resistor
- D. LED Discuss
Correct Answer: capacitor
- 3. In VHDL, each instance of a component is given a name followed by a ________ and the name of the library primitive.
Options- A. function
- B. signal
- C. semicolon
- D. colon Discuss
Correct Answer: colon
- 4. In synchronous systems, the exact times at which any output can change state are determined by a signal commonly called the ________.
Options- A. traffic
- B. D
- C. flip-flop
- D. clock Discuss
Correct Answer: clock
- 5. Assume a J-K flip-flop has 1s on the J and K inputs. The next clock pulse will cause the output to ________.
Options- A. set
- B. reset
- C. latch
- D. toggle Discuss
Correct Answer: toggle
- 6. If an input is activated by a signal transition, it is ________.
Options- A. hair-triggered
- B. line-triggered
- C. pulse-triggered
- D. edge-triggered Discuss
Correct Answer: edge-triggered
- 7. Most people would prefer to use ________ over HDL.
Options- A. graphic descriptions
- B. functions
- C. VHDL
- D. AHDL Discuss
Correct Answer: graphic descriptions
- 8. The major advantage of a Schmitt trigger input is that it ________.
Options- A. avoids erratic triggering
- B. has more triggering methods
- C. has a wider range of outputs
- D. can be retriggered Discuss
Correct Answer: avoids erratic triggering
- 9. Regardless of whether you develop a description in AHDL or VHDL, the circuit's proper operation can be verified using a ________.
Options- A. PROCESS
- B. computer
- C. simulator
- D. primitive library Discuss
Correct Answer: simulator
- 10. When the output of the NOR gate S-R flip-flop is Q = 0 and
, the inputs are:
Options- A. S = 1, R = 1
- B. S = 1, R = 0
- C. S = 0, R = 1
- D. S = 0, R = 0 Discuss
Correct Answer: S = 0, R = 1
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