Is a case moot when the decision of the reviewing court has no practical impact or provides effectual relief?

was filed. We will not render opinions on moot questions or abstract propositions, or declare principles of law which cannot affect the matter at issue on appeal.' [Citations.]" (Building a Better Redondo, Inc. v. City of Redondo Beach (2012) 203 Cal.App.4th 852, 866-867 (Building a Better Redondo, Inc.).) "A case is moot when the decision of the reviewing court 'can have no practical impact or provide the parties effectual relief. [Citation.]' [Citation.]" (MHC Operating Limited Partnership v. City of San Jose (2003) 106 Cal.App.4th 204, 214.) Here, appellant seeks reversal of the judgment reappointing the conservator and he seeks a new trial. The expiration of the challenged conservatorship, however, prevents us from granting appellant any effective relief.