A wave form shown as Input is applied across primary of a pulse transformer which has 1:1 turns ratio. The output on the secondary side will be as shown in the Figure---- [Figure description: The input is a periodic rectangular pulse train (square-ish wave switching between a low and a high level, with short high pulses and longer low intervals). Four candidate output waveforms are drawn below it. (A): a train of triangular/sawtooth-like peaks, each rising and falling back to the baseline, all above the baseline. (B): a rectangular pulse train similar to the input but with its levels shifted/inverted (a high level that drops to a low level for pulses), i.e. a square wave with the same shape and no differentiation. (C): a train of downward-pointing (inverted V) spikes hanging from a top baseline, i.e. only negative-going triangular spikes. (D): a train in which each cycle has a sharp downward spike followed by an upward triangular/decaying peak, i.e. alternating negative and positive spikes (differentiated-looking waveform with both polarities).]
- A. Waveform (A): train of positive triangular/sawtooth peaks
- B. Waveform (B): rectangular pulse train with shifted/inverted levels
- C. Waveform (C): train of downward (negative) V-shaped spikes
- D. Waveform (D): alternating downward spike and upward triangular peak each cycle
Answer: D. Waveform (D): alternating downward spike and upward triangular peak each cycle
Explanation: A transformer cannot pass the DC level; it differentiates the edges, giving alternating positive/negative spikes.