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This paper focuses on describing the strategic use of interrogative constructions in Spanish during the communicative interaction that takes place in couples therapy sessions. Specifically, it focuses on examining how the interrogative construction may help to escalate or de-escalate the communicative conflict that emerges in this type of contexts and what type of interrogative sentences are involved to this end. For this purpose, once the interrogative constructions were identified in the corpus generated by the recording and transcription of therapy sessions of different Spanish couples, the following aspects were observed and interrelated: (a) the type of interrogative constructions used by the Spanish participants in these situations, (b) the role of the participants (couple vs. therapist, sender vs. listener) in the conflict situation and, finally, (c) the strategic use of interrogative constructions to escalate or de-escalate the conflict. As a result of the qualitative analysis of the corpus, strategic discursive uses linked to the thematic progression of the discourse, strategic pragmatic uses linked to the modification of the illocutionary force of the speech acts, and strategic social uses linked to the attempt to (dis)alienate and (dis)affiliate with the other participants in the interaction are all identified.

Modern day life demands the use of inverters at the point of utilization for many of the applications especially for motor drives used in industrial applications. Conventional inverters suffer from a setback of high harmonics at the output of inverter. Multilevel inverters produce stepped output nearer to sinusoidal reducing the harmonic distortion at the output. Faults are quite common in occurrence in inverters and needs to be identified and mitigated as quickly as possible. This paper presents seven-level diode clamped multi-level inverter topology with fourth leg for fault mitigation. Fourth leg is operated with thyristor based control and gets activated from the signals obtained from algorithm. An algorithm was given to identify the fault and send activating signals to fourth leg of inverter. Fault was internally generated only in phase-A in inverter circuits which can be applied the effectiveness of four-leg topology to phase-B and phase-C of inverter as like in phase-A. Simulation work was carried out and results were obtained using MATLAB/SIMULINK software.