How RBI contols Money Supply?

People would be wondering what exactly is role of RBI.

RBI (Reserve Bank of India) is central bank of India which was setup with following objectives:
-To formulate, implement and monitor the monetary policy.
-To maintain price stability and ensuring adequate flow of credit to productive sectors.
For more information on RBI: http://en.wikipedia.org/wiki/Reserve_Bank_of_India

Ques--What are main instruments to control money supply?

Ans--Repo Rate, Reverse Repo Rate, Bank Rate & the Cash Reserve Ratio( CRR)

The Repo Rate: This is the rate at which RBI releases funds into system. It was 6 percent in 2004 but is now at 7.75 per cent

Reverse Repo Rate: This is the rate at which RBI sucks out excess liquidity from the system.

Bank Rate: This is the rate at which RBI lends money to banks. It is currently at 6 per cent.

CRR: This represents the percentage of deposits that every bank has to keep with the RBI. The RBI pays interest on CRR balances and the increases or decreases CRR when it wants to drain or ease liquidity in the economy. The CRR is now at 6.5 percent.

SLR: Statutory Liquidity Ratio is the percentage of deposits that banks have to deploy in government securities and works in the same way as CRR. It is now at 25 percent and has not been changed for a decade.