The Presiding Officer shall have the duty to conduct a fair hearing within the time constraints imposed by section 307(a) of the Act. He shall take all necessary action to avoid delay and to maintain order. He shall have all powers necessary to these ends, including but not limited to the power to:

(a) Rule upon motions and requests;

(b) Change the time and place of the hearing, and adjourn the hearing from time to time or from place to place;

(c) Examine and cross-examine witnesses;

(d) Admit or exclude evidence; and

(e) Require any part or all of the evidence to be submitted in writing and by a certain date.