One permanent stable mode of operation describes which device?

One permanent stable mode of operation describes which device?

• A. Astable Multivibrator
• B. Monostable Multivibrator
• C. Schmitt Trigger
• D. Ring Oscillator

Answer: (B)

In switching circuits, stability of state matters. A monostable multivibrator has one stable state (the resting state) and one transient state. It sits in its stable state until triggered, then briefly changes output and automatically returns to the same stable state after a set time. That single, enduring stable condition matches the idea of having one permanent stable mode of operation. The other devices behave differently: an astable multivibrator has no stable state and keeps oscillating; a Schmitt trigger provides two stable states due to hysteresis and acts like a comparator with memory; a ring oscillator also has no stable state and sustains continuous oscillation.

In switching circuits, stability of state matters. A monostable multivibrator has one stable state (the resting state) and one transient state. It sits in its stable state until triggered, then briefly changes output and automatically returns to the same stable state after a set time. That single, enduring stable condition matches the idea of having one permanent stable mode of operation. The other devices behave differently: an astable multivibrator has no stable state and keeps oscillating; a Schmitt trigger provides two stable states due to hysteresis and acts like a comparator with memory; a ring oscillator also has no stable state and sustains continuous oscillation.