Section 3. No application for registration conforming to the requirements of section two shall be denied except after a public hearing held by the deputy director in accordance with and subject to the provisions of chapter thirty A. No such application shall be denied except upon a finding by the deputy director after said hearing of one or more of the following grounds for denial: (a) that the applicant or any person having a financial interest, direct or indirect, in the business to be conducted by the applicant, has been convicted within the most recent five year period from the date of the application of a felony which may reflect upon his suitability to own or operate; (b) that the applicant or any person having a financial interest, direct or indirect, in the business to be conducted by the applicant, has followed a continuous and flagrant course of misrepresentations or the making of false promises, through advertising or otherwise, in the conduct of motor vehicle repair or motor vehicle glass repair or otherwise; (c) that the applicant, any person having a financial interest direct or indirect, in the business to be conducted by the applicant, or any registered or previously registered motor vehicle repair shop or registered motor vehicle glass repair shop in which the applicant or such person has or had a financial interest, direct or indirect, has failed to meet or has violated any of the requirements for registered motor vehicle repair shops or registered motor vehicle glass repair shops set forth in this chapter or (d) that the applicant, any person having a financial interest, direct or indirect, in the business to be conducted by the applicant, or any registered or previously registered motor vehicle repair shop or registered motor vehicle glass repair shop in which the applicant or such person has or had a financial interest, direct or indirect, has had registration hereunder denied, revoked, suspended or surrendered during the previous five years. Upon denial of an application, the deputy director shall surrender to the applicant the bond filed with his application within the time set forth, but shall not refund the registration fee.