RRB Technician Grade 1 Model Paper 4

Concept:A depletion-type MOSFET has a physically doped channel, so it can work with both negative and positive gate voltages.Explanation:The drain characteristics of a depletion MOSFET show that at $V_{GS} = 0$, a channel already exists and current flows.When a negative gate-to-source voltage $V_{GS}$ is applied, the channel narrows and the device operates in the depletion mode.When a positive $V_{GS}$ is applied, the channel widens and more current flows, so the device operates in the enhancement region.Thus, a depletion MOSFET supports both depletion-mode and enhancement-mode operation.This is different from an enhancement-type MOSFET, where no channel exists at $V_{GS} = 0$ and only enhancement operation is possible.Answer:Depletion type MOSFET operates in both depletion and enhancement mode.Therefore, the correct option is C.