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- Question
Which of the following describes the operation of a positive edge-triggered D-type flip-flop?
Options- A. If both inputs are HIGH, the output will toggle.
- B. The output will follow the input on the leading edge of the clock.
- C. When both inputs are LOW, an invalid state exists.
- D. The input is toggled into the flip-flop on the leading edge of the clock and is passed to the output on the trailing edge of the clock.
- Correct Answer
- The output will follow the input on the leading edge of the clock.
- 1. Which of the following is correct for a gated D-type flip-flop?
Options- A. The Q output is either SET or RESET as soon as the D input goes HIGH or LOW.
- B. The output complement follows the input when enabled.
- C. Only one of the inputs can be HIGH at a time.
- D. The output toggles if one of the inputs is held HIGH. Discuss
- 2. Latches constructed with NOR and NAND gates tend to remain in the latched condition due to which configuration feature?
Options- A. asynchronous operation
- B. low input voltages
- C. gate impedance
- D. cross coupling Discuss
- 3. What is the significance of the J and K terminals on the J-K flip-flop?
Options- A. There is no known significance in their designations.
- B. The J represents "jump," which is how the Q output reacts whenever the clock goes HIGH and the J input is also HIGH.
- C. The letters represent the initials of Johnson and King, the co-inventors of the J-K flip-flop.
- D. All of the other letters of the alphabet are already in use. Discuss
- 4. If both inputs of an S-R NAND latch are LOW, what will happen to the output?
Options- A. The output would become unpredictable.
- B. The output will toggle.
- C. The output will reset.
- D. No change will occur in the output. Discuss
- 5. A basic S-R flip-flop can be constructed by cross-coupling which basic logic gates?
Options- A. AND or OR gates
- B. XOR or XNOR gates
- C. NOR or NAND gates
- D. AND or NOR gates Discuss
- 6. When both inputs of a J-K flip-flop cycle, the output will:
Options- A. be invalid
- B. not change
- C. change
- D. toggle Discuss
- 7. Use the two's complement system to add the signed numbers 11110010 and 11110011. Determine, in decimal, the sign and value of each number and their sum.
Options- A. ?14 and ?13; ?27
- B. ?113 and ?114; 227
- C. ?27 and ?13; 40
- D. ?11 and ?16; ?27 Discuss
- 8. Adding the two's complement of ?11 + (?2) will yield which two's complement answer?
Options- A. 1110 1101
- B. 1111 1001
- C. 1111 0011
- D. 1110 1001 Discuss
- 9. The fast carry or look-ahead carry circuits found in most 4-bit parallel-adder circuits:
Options- A. increase ripple delay
- B. add a 1 to complemented inputs
- C. reduce propagation delay
- D. determine sign and magnitude Discuss
- 10. Adding in binary, the decimal values 26 + 27 will produce a sum of:
Options- A. 111010
- B. 110110
- C. 110101
- D. 101011 Discuss
Flip-Flops and Timers problems
Search Results
Correct Answer: The Q output is either SET or RESET as soon as the D input goes HIGH or LOW.
Correct Answer: cross coupling
Correct Answer: There is no known significance in their designations.
Correct Answer: The output would become unpredictable.
Correct Answer: NOR or NAND gates
Correct Answer: not change
Correct Answer: ?14 and ?13; ?27
Correct Answer: 1111 0011
Correct Answer: reduce propagation delay
Correct Answer: 110101
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