Question

WHAT IS THE DIFFERENCE BETWEEN ENHANCED AND DEPLETION TYPE MOSFET'S

Answer 1

An enhancement mode mosfet is normally non-conducting but conducts when the channel is enhanced by applying a voltage to the gate and pulling carriers into the channel. A depletion mode mosfet normally conducts but becomes more and more non-conducting as carriers are depleted or pulled out of the channel by applying a voltage. there are plenty of stuff available on internet you can go through that, or you can read SEDRA & SMITH for analog electronics , you will get detailed explanation :)