Automatic Control Systems
Which of the following is open loop system?

Aqualing
Wind screen wiper
System for controlling antirocket missiles
Respiratory system of animal

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Automatic Control Systems
In a two phasor servomotor, the direction of rotation of the rotating field depends on

Phase relation of voltages applied to the two stator windings
Magnitudes of voltages applied to the two stator windings
None of these
Both magnitude and phase relationship of voltages applied to the two stator windings

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