Pulses of definite width can be obtained from irregular shaped pulses:

Solution (By Examveda Team)

The correct answer is Option A: When it is given as input to a monostable multivibrator.
Let's break down why:

Monostable Multivibrator:
A monostable multivibrator has one stable state.
When triggered by an input pulse (even an irregular one), it goes into a temporary unstable state for a fixed period of time.
This fixed period is determined by the circuit's components (resistors and capacitors), not the shape of the input pulse.
So, regardless of how the input pulse looks, the output will be a pulse with a definite, predictable width.

Why other options are incorrect:
Bistable Multivibrator: Requires a trigger to flip between two stable states, it doesn't create a pulse of definite width from an irregular input.
Schmitt-trigger: Converts an analog input signal to a digital output signal with hysteresis, but it doesn't necessarily create a pulse of definite width.
Pulse Transformer: Primarily used for voltage or current transformation of pulses, not for shaping them into definite widths. It basically transfers the input pulse, with some modifications to its amplitude and polarity.

In simple terms: Imagine the monostable multivibrator as a timer. You can start the timer with any kind of signal(irregular), but the timer will always run for the same amount of time (definite width).