Automatic Control Systems
Which of the following can be used as a rotating amplifier in a control system? 1. Amplidyne 2. Separately excited dc generator 3. Synchro 4. Self excited dc generator

1, 2 and 3
1 and 2
3 and 4
All

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

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