Automatic Control Systems
Transport lag usually exists in

Thermal, hydraulic and pneumatic systems
Pneumatic systems
Thermal systems
Hydraulic systems and thermal systems

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

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

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