21. An astable multivibrator is a circuit that:
(a) has two stable states
(b) is free-running
(c) produces a continuous output signal
(d) is free-running and produces a continuous output signal
22. The S-R, D-type, and J-K flip-flops are all examples of _________________.
(a) astable multivibrators
(b) bistable multivibrators
(c) monostable multivibrators
(d) tristable multivibrators
23. A retriggerable one-shot has a pulse width of 10 ms; 3 ms after being triggered, another trigger pulse is applied. The resulting output pulse will be _________ ms.
(a) 3
(b) 7
(c) 10
(d) 13
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