Relatively conservative fixed income fund could give a return merely similar or slightly higher than FD; in the range of 3.5 to 4.5%

Moderately aggressive fixed income fund could give a better higher return at the range of 5 to 6%; they will with short to medium term papers with lower credit rating (below triple As).

Balanced fixed income fund will invest a portion of it into equity market; usually up to 30 to 50% of total NAV

Aggressive fixed income fund could give a much higher return up to 8%. They will mix with several instruments in order to meet such high return.

Disclaimer: Above comments are generalization and not specifically refer to any fund in particular