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Digital Electronics - Flip-Flops

Exercise : Flip-Flops - General Questions
16.
With regard to a D latch, ________.
the Q output follows the D input when EN is LOW
the Q output is opposite the D input when EN is LOW
the Q output follows the D input when EN is HIGH
the Q output is HIGH regardless of EN's input state
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
How can the cross-coupled NAND flip-flop be made to have active-HIGH S-R inputs?
It can't be done.
Invert the Q outputs.
Invert the S-R inputs.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.
When is a flip-flop said to be transparent?
when the Q output is opposite the input
when the Q output follows the input
when you can see through the IC packaging
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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.

The circuit is functioning properly.
Q2 is incorrect; the flip-flop is probably bad.
The input to flip-flop 3 (D2) is probably wrong; check the source of D2.
A bad connection probably exists between FF-3 and FF-4, causing FF-3 not to reset.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
A 555 operating as a monostable multivibrator has an R1 of 1 M. Determine C1 for a pulse width of 2 s.
1.8 F
18 F
18 pF
18 nF
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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