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# Digital Electronics - Flip-Flops

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### Exercise

"You cannot shake hands with a clenched fist."
- Indira Gandhi
19.

Four positive edge-triggered D flip-flops are used to store a 4-bit binary number as shown below. Determine if the circuit is functioning properly, and if not, what might be wrong.

 A. The circuit is functioning properly. B. Q2 is incorrect; the flip-flop is probably bad. C. The input to flip-flop 3 (D2) is probably wrong; check the source of D2. D. A bad connection probably exists between FF-3 and FF-4, causing FF-3 not to reset.

20.

A 555 operating as a monostable multivibrator has an R1 of 1 M. Determine C1 for a pulse width of 2 s.

 A. 1.8 F B. 18 F C. 18 pF D. 18 nF

21.

Master-slave J-K flip-flops are called pulse-triggered or level-triggered devices because input data is read during the entire time the clock pulse is at a LOW level.

 A. True B. False

22.

Which of the following is correct for a D latch?

 A. The output toggles if one of the inputs is held HIGH. B. Q output follows the input D when the enable is HIGH. C. Only one of the inputs can be HIGH at a time. D. The output complement follows the input when enabled.

23.

A J-K flip-flop is in a "no change" condition when ________.

 A. J = 1, K = 1 B. J = 1, K = 0 C. J = 0, K = 1 D. J = 0, K = 0

24.

A correct output is achieved from a master-slave J-K flip-flop only if its inputs are stable while the:

 A. clock is LOW B. slave is transferring C. flip-flop is reset D. clock is HIGH