During the recess, the Departmentally Related Standing Committees of Parliament examine the Demand for Grants submitted by various Ministries.  The Demand for Grants are detailed explanations of that Ministry's annual budget which form part of the total budget of the government.  These are examined in detail, and the committees can approve of the demands, or suggest changes.  The Demand for Grants are finally discussed and voted on by the Parliament after the recess.  (The post below lists the ministries whose Demand for Grants will be discussed in detail after the recess). The issue is - how effective is the institution of Parliament in examining the budget?  Though India specific information on this subject is hard to find, K. Barraclough and B. Dorotinsky have cited the World Bank - OECD Budget procedures Database to formulate a table on the legislature approving the budget presented by the executive ("The Role of the Legislature in the Budget Process: A Comparative Review", Legislative Oversight and Budgeting).  I reproduce the table below:

In Practice, does the legislature generally approve the budget as presented by the Executive? (in percent)
Answer All Countries OECD Countries Presidential democracies Parliamentary democracies
It generally approves the budget with no changes 34 33 14 41
Minor changes are made (affecting less than 3% of total spending) 63 67 71 59
Major changes are made (affecting more than 3% but less than 20% of total spending) 2 0 7 0
The budget approved is significantly different (affecting more than 20% of total spending) 0 0 0 0
Sources:  K. Barraclough and B. Dorotinsky; PRS.

One of our earlier posts (read here) tackled the question of whether the Public Accounts Committee could summon ministers or not. According to a direction of the speaker, a Minister cannot be summoned by a financial committee. There are no specific procedures for the Joint Parliamentary Committees mentioned in the rules. However, according to the Directions by the Speaker general rules applicable to Committees shall apply to all Committees, though specific directions can be given for some committees (read here).  In other words, the general directions for all committees would be the same, unless a specific direction was given relating to a particular committee. In the Joint Committee of Stock Market Scam and Matters relating there to, a specific request was made to the Speaker, Lok Sabha by the Chairman, JPC on 20th May, 2002 for permitting the Committee to call for written information on certain points from the Minister of Finance and Minister of External Affairs. The Speaker accorded the necessary permission on 1st June, 2002. Consequently, the Minister of Finance (Shri Jaswant Singh), the Minister of External Affairs (Shri Yashwant Sinha) and the former Finance and External Affairs ministers (Shri P. Chidambaram and Dr. Manmohan Singh respectively) testified before the Committee. Read the text of the report here.