Dismissal, removal or reduction in rank of persons employed in civil capacities under the Union or a State ( 1) . . . . . . (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: . . . . . . . . . 433 Provided further that this clause shall not apply A (a) where a person is dismissed or removed or reduced in rank on the ground ' of conduct 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.