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yes, diode can be used as rectifier diode to convert ac to dc
yes ofcourse diode can be used as rectifier but it's an uncontrolled rectification.
tunnel diode
the doping level of the tunnel diode is high when compared with the rectifier diode
it exhibits negative resistance
rectifier diode
the doping level of rectifier diode is low when compared with the tunnel diode
A diode is used primarily as a Rectifier
An open diode will result in no output from a half wave rectifier, and an open diode will cut the output of a full wave rectifier in half.