Powers of arbitrator. The arbitrators or umpire shall, unless a different intention is expressed in the agreement, have power to-
a administer oath to the parties and witnesses appearing
b state a special case for the opinion of the Court on any question of law involved, or state the award, wholly or in part, in the form of a special case of such question for the opinion of the Court
c make the award conditional or in the alternative
d correct in an award any clerical mistake or error arising from any accidental slip or omission
e administer to any party to the arbitration such interrogatories as may, in the opinion of the arbitrators or umpire, be necessary.