Explanation:

He does not vote in the first instance. But he can exercise a casting vote in the case of a tie. In other words, only when the House is divided equally on any question, the Speaker is entitled to vote. Such vote is called casting vote, and its purpose is to resolve a deadlock. The Speaker of the Lok Sabha derives his powers and duties from three sources, that is, the Constitution of India, the Rules of Procedure and Conduct of Business of Lok Sabha, and Parliamentary Conventions (residuary powers that are unwritten or unspecified in the Rules).
Altogether, he has the following powers and duties:

• He maintains order and decorum in the House for conducting its business and regulating its proceedings. This is his primary responsibility and he has final power in this regard.
• He is the final interpreter of the provisions of (a) the Constitution of India, (b) the Rules of Procedure and Conduct of Business of Lok Sabha, and (c) the parliamentary precedents, within the House.
• He adjourns the House or suspends the meeting in absence of a quorum. The quorum to constitute a meeting of the House is one-tenth of the total strength of the House.
• He presides over a joint setting of the two Houses of Parliament. Such a sitting is summoned by the President to settle a deadlock between the two Houses on a bill.