A monostable multivibrator has which of the following state(s)? I. One stable…
2021
A monostable multivibrator has which of the following state(s)?
I. One stable state
II. One quasi-stable state
Answer: C. Both I and II — ConceptA monostable multivibrator is a pulse-generating circuit with one stable equilibrium state and one temporary, quasi-stable state. Without a trigger, it…
- A.
Only I
- B.
Only II
- C.
Both I and II
- D.
Neither I nor II
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Correct answer: C
Concept
A monostable multivibrator is a pulse-generating circuit with one stable equilibrium state and one temporary, quasi-stable state.
Without a trigger, it remains indefinitely in the stable state. A trigger causes a timed excursion to the quasi-stable state, after which the circuit returns automatically to the stable state.
Application
Statement I names the stable equilibrium in which the circuit can remain without a time limit.
Statement II names the quasi-stable state reached after a trigger; the circuit stays there only for the interval set by its timing network.
The two statements together describe the complete state structure of a monostable multivibrator.
Contrast
Only I omits the temporary state used during the output pulse.
Only II omits the stable state to which the circuit returns.
Neither I nor II excludes both states that define monostable operation.
Cross-check
A bistable multivibrator has two stable states, whereas an astable multivibrator has no stable state. The monostable case lies between them: one stable state and one quasi-stable state. Therefore, both I and II are included.