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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
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
Answer
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Related Question
Automatic Control Systems
Nichols chart consists of
Constant phase angle loci
Magnitude and phase angle loci in log-magnitude versus phase diagram
None of these
Constant magnitude loci
Constant phase angle loci
Magnitude and phase angle loci in log-magnitude versus phase diagram
None of these
Constant magnitude loci
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 cannot be used to determine stability
Routh criterion can be used by substituting a small negative number for zero and complet-ing the array
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 cannot be used to determine stability
Routh criterion can be used by substituting a small negative number for zero and complet-ing the array
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
The complicated shapes in the polar plots are only due to time constants in the numerator of transfer functions.
False
True
False
True
Answer
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Automatic Control Systems
M circles are symmetrical with respect to
M = 1 straight line
Real and imaginary axis
M = 1 straight line and real axis
M = 1 straight line and imaginary axis
M = 1 straight line
Real and imaginary axis
M = 1 straight line and real axis
M = 1 straight line and imaginary axis
Answer
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Automatic Control Systems
A conditionally stable system is stable for the value of gain between two critical values. It is unstable if
Both A and B
The gain is increased beyond upper critical value
None of these
The gain is decreased below lower critical value
Both A and B
The gain is increased beyond upper critical value
None of these
The gain is decreased below lower critical value
Answer
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