Field Effect transistor is:

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RRB ALP Electronics Mechanic 23 Jan 2019 Official Paper (Shift 2)

Answer 1

Field effect transistor (FET)

The field-effect transistor (FET) is a type of transistor that uses an electric field to control the flow of current in a semiconductor.
FETs are devices with three terminals: source, gate, and drain. FETs control the flow of current by the application of a voltage to the gate, which in turn alters the conductivity between the drain and the source.
FETs naturally contain two p-n junctions, hence it is a Bi-junction device.
FETs use either electrons (n-channel) or holes (p-channel) as charge carriers in their operation, but not both.
Field effect transistors generally display very high input impedance at low frequencies.