Any trustee may, without instituting a suit, apply by petition to a principal Civil Court of original jurisdiction for its opinion, advice or direction on any present questions respecting the management or administration of the trust-property other than questions of detail, difficulty or importance, not proper in the opinion of the Court for summary disposal.

   A copy of such petition shall be served upon, and the hearing thereof may be attended by, such of the persons interested in the application as the Court thinks fit.

   The trustee stating in good faith the facts in such petition and acting upon the opinion, advice or direction given by the Court shall be deemed, so far as regards his own responsibility, to have discharged his duty as such trustee in the subject-matter of the application.

   The costs of every application under this section shall be in the discretion of the Court to which it is made.