1.

Which of the following are present in an ESA?(a) Gimbals(b) Electronic motors(c) Phase shifter(d) Potentiometer

Answer» Right answer is (c) Phase shifter

Explanation: The ESA has no mechanical moving parts, such as antenna gimbals, potentiometers, rotary joints, or hydraulic/electronic motors. It uses phase shifters to electronically steer the beam.


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