Question

Which of the following is an open loop control system ?

(a) Field controlled D.C. motor

(b) Ward leonard control

(c) Metadyne

(d) Stroboscope

The question was posed to me by my school teacher while I was bunking the class.

The query is from Open-Loop Transfer Function in chapter Automatic Control of Machine Dynamics

Answer 1

Right choice is (a) Field controlled D.C. motor

The best I can explain: In field control D.C. motor, the input is dependent of the output. So it is an open loop control system.