Clause (2) of article 311 of the Constitution, as it stands after amendment by the Constitution (Fifteenth Amendment) Act, 1963 reads as follows : "311.(2) No such person as aforesaid shall be dismissed or removed or reduced in rank except after an inquiry in which he has been informed of the charges against him and given a reasonable opportunity of being heard in respect of those charges and where it is proposed, after such inquiry, to impose on him any such penalty, until he has been given a reasonable opportunity of making representation on the penalty proposed, but only on the basis of the evidence adduced during such inquiry : Provided that this clause shall not apply (a) where a person is dismissed or removed or reduced in rank on the ground of conduct 487 which has led to his conviction on a criminal charge; or (b) Where the authority empowered to dismiss or remove a person or to reduce him in rank is satisfied that for some reason, to be recorded by that authority in writing, it is not reasonably practicable to hold such inquiry; or (c) where the President or the Governor, as the case may be, is satisfied that in the interest of the security of the State it is not expedient to hold such inquiry.