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Automatic Control Systems
The sensor generally used in incremental optical encoder is
LCD
Photodiode
Either (a) or (b)
LED
LCD
Photodiode
Either (a) or (b)
LED
Answer
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Related Question
Automatic Control Systems
Gain margin and phase margin can be determined from Bode plots as well as Nyquist plot.
False
True
False
True
Answer
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Automatic Control Systems
In Bode plots the frequency at which two asymptotes meet is called corner frequency.
True
False
True
False
Answer
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Automatic Control Systems
Which control action can never be used alone?
Both (b) and (c)
Integral
Proportional
Derivative
Both (b) and (c)
Integral
Proportional
Derivative
Answer
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Automatic Control Systems
If any term in the first column of a Routh array becomes zero, then
Routh criterion can be used by substituting a small positive number for zero and completing the array
Routh criterion can be used by substituting a small negative number for zero and complet-ing the array
Routh criterion cannot be used to determine stability
Routh criterion can be used by substituting a big positive number for zero and completing the array
Routh criterion can be used by substituting a small positive number for zero and completing the array
Routh criterion can be used by substituting a small negative number for zero and complet-ing the array
Routh criterion cannot be used to determine stability
Routh criterion can be used by substituting a big positive number for zero and completing the array
Answer
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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
None of these
Both magnitude and phase relationship of voltages applied to the two stator windings
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
Phase relation of voltages applied to the two stator windings
Answer
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