industry-recognized training provider. A certificate of the appointment or reappointment of any commissioner shall be filed with the clerk and shall be conclusive evidence of the legal appointment of such commissioner, after said commissioner has taken an oath in the form prescribed in the first paragraph of section 1-25. The powers of each authority shall be vested in the commissioners thereof. Three commissioners shall constitute a quorum if the authority consists of five commissioners. Four commissioners shall constitute a quorum if the authority consists of more than five commissioners. Action may be taken by the authority upon a vote of not less than a majority of the commissioners present unless the bylaws of the authority require a larger number. The chief executive officer, or, in the case of an authority for a town, the governing body of the town, shall designate which of the commissioners shall be the first chairman, but when the office of chairman of the authority becomes vacant, the authority shall select a chairman from among its commissioners. An authority shall select from among its commissioners a vice chairman, and it may employ a secretary, who shall be executive director, and technical experts and such other officers, agents and employees, permanent and temporary, as it requires, and shall determine their qualifications, duties and compensation, provided, in municipalities having a civil service law, all appointments and promotions, except the employment of the secretary, shall be based on examinations given and lists prepared under such law, and, except so far as may be inconsistent with the terms of this chapter, such civil service law and regulations adopted thereunder shall apply to such housing authority and its personnel. For such legal