Q.

Amplifier:

A. armature controlled fhp dc motor
B. a pair of synchronous transmitter and control transformer
C. tach generator
D. amplidyne
Answer» D. amplidyne
Explanation: amplifier is an amplidyne which is an amplidyne is an electromechanical amplifier invented during world war ii by ernst alexanderson. it consists of an electric motor driving a dc generator.
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