How can the jurisdiction of a public service commission be expanded or limited?
The jurisdiction of a public service commission can be expanded or limited through the following provisions:

1. Public Service Commissions for the Union and States (Article 315): This article states that there shall be a Public Service Commission for the Union and a Public Service Commission for each State, subject to the provisions of this Article. Thus, the jurisdiction can be expanded or limited by creating new public service commissions or merging existing ones.

2. Joint State Public Service Commission (Article 315(2)): Two or more States may agree to have a single joint commission to serve their needs, and if a resolution is passed by the legislature of each state, Parliament can provide for the appointment of such a commission through legislation. This allows for expanding or limiting the jurisdiction of public service commissions based on inter-state agreements.

3. Public Service Commission for the Union serving State needs (Article 315(4)): The Union Public Service Commission may serve the needs of a State if requested by the Governor and with the approval of the President, allowing for expansion or limitation of jurisdiction depending on state requests and presidential approval.