When a local board has disapproved an application, the applicant shall be afforded a hearing for the purpose of producing any such evidence before the Authority as he shall desire with reference to the reasons for disapproval stated by the local board. In addition to the evidence produced by the applicant in such hearing, the local board or the Authority may also introduce such evidence as it deems necessary with reference thereto. The hearing shall be conducted by a member of the Authority or any employee of the Authority duly designated by the Authority so to act, who shall be known as the hearing commissioner. The hearing commissioner shall rule upon matters of procedure and introduction of evidence, and shall conduct the proceeding in such manner as will best serve the purpose of the attainment of justice and dispatch. Objections may be taken to rulings of the hearing commissioner with the reasons for such objections stated, but will not be deemed to have been made unless duly noted in the stenographic record.